Nightly private modes

(default settings)
brave logo
brave
1.97

private
brave logo
brave
1.97

Tor
chrome logo
chrome
155.0

private
duckduckgo logo
duckduckgo
1.206

private
edge logo
edge
155.0

private
firefox logo
firefox
158.0a1

private
opera logo
opera
137.0

private
tor logo
tor
16.0a11
vivaldi logo
vivaldi
8.3

private
State Partitioning testsWhich browsers isolate websites to prevent them from sharing data to track you?
A common vulnerability of web browsers is that they allow tracking companies to 'tag' your browser with some data ('state') that identifies you. When third-party trackers are embedded in websites, they can see this identifying data as you browse to different websites. Fortunately, it is possible for this category of leaks to be fixed by partitioning all data stored in the browser such that no data can be shared between websites.
Alt-Svc
Alt-Svc allows the server to indicate to the web browser that a resource should be loaded on a different server. Because this is a persistent setting, it could be used to track users across websites if it is not correctly partitioned.
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same first party: h3, h3, h3, h3
result, different first party: h2, h2, h2, h2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Unsupported
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
result, different first party: h2, h2, h2, h2, h2
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same first party: h3, h3, h3
result, different first party: h2, h2, h2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Unsupported
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
result, different first party: h2, h2, h2, h2, h2
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same first party: h3, h3, h3
result, different first party: h2, h2, h2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same first party: h3, h3, h3, h3, h3
result, different first party: h2, h2, h2, h2, h2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same first party: h3, h3, h3, h3, h3
result, different first party: h2, h2, h2, h2, h2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
result, different first party: h2, h2, h2, h2, h2
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same first party: h3, h3, h3, h3, h3
result, different first party: h2, h2, h2, h2, h2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
blob
A 'blob URL' is a local reference to some raw data. Trackers can use a blob URL to share data between websites.
Passed
write: (secret) => {
        try {
          const blobURL = URL.createObjectURL(new Blob([secret]));
          fetch(`${baseURI}blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async (secret) => {
        const response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
        const result = await response.json();
        const blobUrl = decodeURIComponent(result.blobUrl);
        const blobResponse = await fetch(blobUrl);
        return blobResponse.text();
      }
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a,
d19de502-0304-4b31-a9bb-1b9e72c0f51e,
f8e2f297-52d1-4075-bf1f-e66acc780fbd,
9675e758-e2c4-4130-acb7-67ccb3ae4433
result, different first party:
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (secret) => {
        try {
          const blobURL = URL.createObjectURL(new Blob([secret]));
          fetch(`${baseURI}blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async (secret) => {
        const response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
        const result = await response.json();
        const blobUrl = decodeURIComponent(result.blobUrl);
        const blobResponse = await fetch(blobUrl);
        return blobResponse.text();
      }
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d,
01aefaa8-0431-400c-988e-1e1f7ba982a2,
c16dd0cb-2eec-4459-930e-0217f9358f39,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d,
dd31aac8-be49-4126-9b1a-f301e645dba3
result, different first party:
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        try {
          const blobURL = URL.createObjectURL(new Blob([secret]));
          fetch(`${baseURI}blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async (secret) => {
        const response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
        const result = await response.json();
        const blobUrl = decodeURIComponent(result.blobUrl);
        const blobResponse = await fetch(blobUrl);
        return blobResponse.text();
      }
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0,
4cf6bd79-a682-476a-8d83-543566af5966,
9499e247-17ea-47f5-a207-44718b449f78
result, different first party:
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => {
        try {
          const blobURL = URL.createObjectURL(new Blob([secret]));
          fetch(`${baseURI}blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async (secret) => {
        const response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
        const result = await response.json();
        const blobUrl = decodeURIComponent(result.blobUrl);
        const blobResponse = await fetch(blobUrl);
        return blobResponse.text();
      }
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad,
2d665fbd-6aed-4dcb-9795-6b402ad715cf,
97cdd9bf-f365-46b9-a68c-6f50a80312c2,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9
result, different first party:
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        try {
          const blobURL = URL.createObjectURL(new Blob([secret]));
          fetch(`${baseURI}blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async (secret) => {
        const response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
        const result = await response.json();
        const blobUrl = decodeURIComponent(result.blobUrl);
        const blobResponse = await fetch(blobUrl);
        return blobResponse.text();
      }
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
fc6c9ea8-266b-4041-ab82-7816d96decb6,
4658621f-e0d9-453c-9f17-1fdc982b3268
result, different first party:
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => {
        try {
          const blobURL = URL.createObjectURL(new Blob([secret]));
          fetch(`${baseURI}blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async (secret) => {
        const response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
        const result = await response.json();
        const blobUrl = decodeURIComponent(result.blobUrl);
        const blobResponse = await fetch(blobUrl);
        return blobResponse.text();
      }
result, same first party:
5372076f-3b55-4ff8-b265-cb8a9a54369f,
7c511f33-ee8a-4882-8d4c-c9a01f8db872,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6,
ab09d644-f080-47bd-b750-d1da1a205b91,
0c060fef-486b-40b4-86e7-0552c4a69628
result, different first party:
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        try {
          const blobURL = URL.createObjectURL(new Blob([secret]));
          fetch(`${baseURI}blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async (secret) => {
        const response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
        const result = await response.json();
        const blobUrl = decodeURIComponent(result.blobUrl);
        const blobResponse = await fetch(blobUrl);
        return blobResponse.text();
      }
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778,
15741f5b-efc4-4dd7-b942-c3fbf5b70949,
38ffa9bf-22f2-49d1-b3fc-569208060f22,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
result, different first party:
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        try {
          const blobURL = URL.createObjectURL(new Blob([secret]));
          fetch(`${baseURI}blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async (secret) => {
        const response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
        const result = await response.json();
        const blobUrl = decodeURIComponent(result.blobUrl);
        const blobResponse = await fetch(blobUrl);
        return blobResponse.text();
      }
result, same first party:
41a8db60-b13d-42b6-9555-2ec1278f1356,
b131da08-bc4b-4f09-812e-e871d00e2d15,
cd3789f3-aadd-451e-9453-63af8ca0911d,
2d8d311f-2398-48bf-8c31-78244bd75007,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48
result, different first party:
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        try {
          const blobURL = URL.createObjectURL(new Blob([secret]));
          fetch(`${baseURI}blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async (secret) => {
        const response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
        const result = await response.json();
        const blobUrl = decodeURIComponent(result.blobUrl);
        const blobResponse = await fetch(blobUrl);
        return blobResponse.text();
      }
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db,
74777a72-fa7e-4298-943d-1a9bdb94a59e,
893c3bd2-a670-422b-b066-0c9e6af00478,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
28252f01-30e4-4331-bba9-8edf371247c2
result, different first party:
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
BroadcastChannel
A BroadcastChannel is designed to send messages between tabs. In some browsers it can be used for cross-site communication and tracking.
Passed
write: (secret) => {
        try {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data === 'request') {
              bc.postMessage(secret);
            }
          };
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () =>
        new Promise((resolve, reject) => {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data !== 'request') {
              resolve(event.data);
            }
          };
          bc.postMessage('request');
          setTimeout(() => reject(new Error('no BroadcastChannel message')), 3000);
        })
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a,
d19de502-0304-4b31-a9bb-1b9e72c0f51e,
f8e2f297-52d1-4075-bf1f-e66acc780fbd,
9675e758-e2c4-4130-acb7-67ccb3ae4433
result, different first party:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (secret) => {
        try {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data === 'request') {
              bc.postMessage(secret);
            }
          };
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () =>
        new Promise((resolve, reject) => {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data !== 'request') {
              resolve(event.data);
            }
          };
          bc.postMessage('request');
          setTimeout(() => reject(new Error('no BroadcastChannel message')), 3000);
        })
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d,
01aefaa8-0431-400c-988e-1e1f7ba982a2,
c16dd0cb-2eec-4459-930e-0217f9358f39,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d,
dd31aac8-be49-4126-9b1a-f301e645dba3
result, different first party:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        try {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data === 'request') {
              bc.postMessage(secret);
            }
          };
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () =>
        new Promise((resolve, reject) => {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data !== 'request') {
              resolve(event.data);
            }
          };
          bc.postMessage('request');
          setTimeout(() => reject(new Error('no BroadcastChannel message')), 3000);
        })
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0,
4cf6bd79-a682-476a-8d83-543566af5966,
9499e247-17ea-47f5-a207-44718b449f78
result, different first party:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => {
        try {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data === 'request') {
              bc.postMessage(secret);
            }
          };
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () =>
        new Promise((resolve, reject) => {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data !== 'request') {
              resolve(event.data);
            }
          };
          bc.postMessage('request');
          setTimeout(() => reject(new Error('no BroadcastChannel message')), 3000);
        })
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad,
2d665fbd-6aed-4dcb-9795-6b402ad715cf,
97cdd9bf-f365-46b9-a68c-6f50a80312c2,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9
result, different first party:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        try {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data === 'request') {
              bc.postMessage(secret);
            }
          };
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () =>
        new Promise((resolve, reject) => {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data !== 'request') {
              resolve(event.data);
            }
          };
          bc.postMessage('request');
          setTimeout(() => reject(new Error('no BroadcastChannel message')), 3000);
        })
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
fc6c9ea8-266b-4041-ab82-7816d96decb6,
4658621f-e0d9-453c-9f17-1fdc982b3268
result, different first party:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => {
        try {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data === 'request') {
              bc.postMessage(secret);
            }
          };
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () =>
        new Promise((resolve, reject) => {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data !== 'request') {
              resolve(event.data);
            }
          };
          bc.postMessage('request');
          setTimeout(() => reject(new Error('no BroadcastChannel message')), 3000);
        })
result, same first party:
5372076f-3b55-4ff8-b265-cb8a9a54369f,
7c511f33-ee8a-4882-8d4c-c9a01f8db872,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6,
ab09d644-f080-47bd-b750-d1da1a205b91,
0c060fef-486b-40b4-86e7-0552c4a69628
result, different first party:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        try {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data === 'request') {
              bc.postMessage(secret);
            }
          };
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () =>
        new Promise((resolve, reject) => {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data !== 'request') {
              resolve(event.data);
            }
          };
          bc.postMessage('request');
          setTimeout(() => reject(new Error('no BroadcastChannel message')), 3000);
        })
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778,
15741f5b-efc4-4dd7-b942-c3fbf5b70949,
38ffa9bf-22f2-49d1-b3fc-569208060f22,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
result, different first party:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        try {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data === 'request') {
              bc.postMessage(secret);
            }
          };
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () =>
        new Promise((resolve, reject) => {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data !== 'request') {
              resolve(event.data);
            }
          };
          bc.postMessage('request');
          setTimeout(() => reject(new Error('no BroadcastChannel message')), 3000);
        })
result, same first party:
41a8db60-b13d-42b6-9555-2ec1278f1356,
b131da08-bc4b-4f09-812e-e871d00e2d15,
cd3789f3-aadd-451e-9453-63af8ca0911d,
2d8d311f-2398-48bf-8c31-78244bd75007,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48
result, different first party:
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        try {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data === 'request') {
              bc.postMessage(secret);
            }
          };
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () =>
        new Promise((resolve, reject) => {
          const bc = new BroadcastChannel('secrets');
          bc.onmessage = (event) => {
            if (event.data !== 'request') {
              resolve(event.data);
            }
          };
          bc.postMessage('request');
          setTimeout(() => reject(new Error('no BroadcastChannel message')), 3000);
        })
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db,
74777a72-fa7e-4298-943d-1a9bdb94a59e,
893c3bd2-a670-422b-b066-0c9e6af00478,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
28252f01-30e4-4331-bba9-8edf371247c2
result, different first party:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
CacheStorage
The Cache API is a content storage mechanism originally introduced to support ServiceWorkers. If the same Cache object is accessible to multiple websites, it can be abused to track users.
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a,
d19de502-0304-4b31-a9bb-1b9e72c0f51e,
f8e2f297-52d1-4075-bf1f-e66acc780fbd,
9675e758-e2c4-4130-acb7-67ccb3ae4433
result, different first party:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d,
01aefaa8-0431-400c-988e-1e1f7ba982a2,
c16dd0cb-2eec-4459-930e-0217f9358f39,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d,
dd31aac8-be49-4126-9b1a-f301e645dba3
result, different first party:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0,
4cf6bd79-a682-476a-8d83-543566af5966,
9499e247-17ea-47f5-a207-44718b449f78
result, different first party:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad,
2d665fbd-6aed-4dcb-9795-6b402ad715cf,
97cdd9bf-f365-46b9-a68c-6f50a80312c2,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9
result, different first party:
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
fc6c9ea8-266b-4041-ab82-7816d96decb6,
4658621f-e0d9-453c-9f17-1fdc982b3268
result, different first party:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same first party:
5372076f-3b55-4ff8-b265-cb8a9a54369f,
7c511f33-ee8a-4882-8d4c-c9a01f8db872,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6,
ab09d644-f080-47bd-b750-d1da1a205b91,
0c060fef-486b-40b4-86e7-0552c4a69628
result, different first party:
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778,
15741f5b-efc4-4dd7-b942-c3fbf5b70949,
38ffa9bf-22f2-49d1-b3fc-569208060f22,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
result, different first party:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same first party:
41a8db60-b13d-42b6-9555-2ec1278f1356,
b131da08-bc4b-4f09-812e-e871d00e2d15,
cd3789f3-aadd-451e-9453-63af8ca0911d,
2d8d311f-2398-48bf-8c31-78244bd75007,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48
result, different first party:
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db,
74777a72-fa7e-4298-943d-1a9bdb94a59e,
893c3bd2-a670-422b-b066-0c9e6af00478,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
28252f01-30e4-4331-bba9-8edf371247c2
result, different first party:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
cookie (HTTP)
The cookie, first introduced by Netscape in 1994, is a small amount of data stored by your browser on a website's behalf. It has legitimate uses, but it is also the classic cross-site tracking mechanism, and today still the most popular method of tracking users across websites. Browsers can stop cookies from being used for cross-site tracking by either blocking or partitioning them.
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_http,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_http,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_http,
9675e758-e2c4-4130-acb7-67ccb3ae4433_http
result, different first party: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d_http,
01aefaa8-0431-400c-988e-1e1f7ba982a2_http,
c16dd0cb-2eec-4459-930e-0217f9358f39_http,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_http,
dd31aac8-be49-4126-9b1a-f301e645dba3_http
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0_http,
4cf6bd79-a682-476a-8d83-543566af5966_http,
9499e247-17ea-47f5-a207-44718b449f78_http
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad_http,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_http,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_http,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_http,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_http
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96_http,
fc6c9ea8-266b-4041-ab82-7816d96decb6_http,
4658621f-e0d9-453c-9f17-1fdc982b3268_http
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same first party:
5372076f-3b55-4ff8-b265-cb8a9a54369f_http,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_http,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_http,
ab09d644-f080-47bd-b750-d1da1a205b91_http,
0c060fef-486b-40b4-86e7-0552c4a69628_http
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778_http,
15741f5b-efc4-4dd7-b942-c3fbf5b70949_http,
38ffa9bf-22f2-49d1-b3fc-569208060f22_http,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0_http,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38_http
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same first party:
41a8db60-b13d-42b6-9555-2ec1278f1356_http,
b131da08-bc4b-4f09-812e-e871d00e2d15_http,
cd3789f3-aadd-451e-9453-63af8ca0911d_http,
2d8d311f-2398-48bf-8c31-78244bd75007_http,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48_http
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db_http,
74777a72-fa7e-4298-943d-1a9bdb94a59e_http,
893c3bd2-a670-422b-b066-0c9e6af00478_http,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9_http,
28252f01-30e4-4331-bba9-8edf371247c2_http
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
cookie (JS)
The cookie, first introduced by Netscape in 1994, is a small amount of data stored by your browser on a website's behalf. It has legitimate uses, but it is also the classic cross-site tracking mechanism, and today still the most popular method of tracking users across websites. Browsers can stop cookies from being used for cross-site tracking by either blocking or partitioning them.
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_js,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_js,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_js,
9675e758-e2c4-4130-acb7-67ccb3ae4433_js
result, different first party: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d_js,
01aefaa8-0431-400c-988e-1e1f7ba982a2_js,
c16dd0cb-2eec-4459-930e-0217f9358f39_js,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_js,
dd31aac8-be49-4126-9b1a-f301e645dba3_js
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0_js,
4cf6bd79-a682-476a-8d83-543566af5966_js,
9499e247-17ea-47f5-a207-44718b449f78_js
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad_js,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_js,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_js,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_js,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_js
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96_js,
fc6c9ea8-266b-4041-ab82-7816d96decb6_js,
4658621f-e0d9-453c-9f17-1fdc982b3268_js
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
5372076f-3b55-4ff8-b265-cb8a9a54369f_js,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_js,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_js,
ab09d644-f080-47bd-b750-d1da1a205b91_js,
0c060fef-486b-40b4-86e7-0552c4a69628_js
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778_js,
15741f5b-efc4-4dd7-b942-c3fbf5b70949_js,
38ffa9bf-22f2-49d1-b3fc-569208060f22_js,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0_js,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38_js
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
41a8db60-b13d-42b6-9555-2ec1278f1356_js,
b131da08-bc4b-4f09-812e-e871d00e2d15_js,
cd3789f3-aadd-451e-9453-63af8ca0911d_js,
2d8d311f-2398-48bf-8c31-78244bd75007_js,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48_js
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db_js,
74777a72-fa7e-4298-943d-1a9bdb94a59e_js,
893c3bd2-a670-422b-b066-0c9e6af00478_js,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9_js,
28252f01-30e4-4331-bba9-8edf371247c2_js
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
CookieStore
The Cookie Store API is an alternative asynchronous API for managing cookies, supported by some browsers.
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a,
d19de502-0304-4b31-a9bb-1b9e72c0f51e,
f8e2f297-52d1-4075-bf1f-e66acc780fbd,
9675e758-e2c4-4130-acb7-67ccb3ae4433
result, different first party: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d,
01aefaa8-0431-400c-988e-1e1f7ba982a2,
c16dd0cb-2eec-4459-930e-0217f9358f39,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d,
dd31aac8-be49-4126-9b1a-f301e645dba3
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0,
4cf6bd79-a682-476a-8d83-543566af5966,
9499e247-17ea-47f5-a207-44718b449f78
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad,
2d665fbd-6aed-4dcb-9795-6b402ad715cf,
97cdd9bf-f365-46b9-a68c-6f50a80312c2,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
fc6c9ea8-266b-4041-ab82-7816d96decb6,
4658621f-e0d9-453c-9f17-1fdc982b3268
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same first party:
5372076f-3b55-4ff8-b265-cb8a9a54369f,
7c511f33-ee8a-4882-8d4c-c9a01f8db872,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6,
ab09d644-f080-47bd-b750-d1da1a205b91,
0c060fef-486b-40b4-86e7-0552c4a69628
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778,
15741f5b-efc4-4dd7-b942-c3fbf5b70949,
38ffa9bf-22f2-49d1-b3fc-569208060f22,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same first party:
41a8db60-b13d-42b6-9555-2ec1278f1356,
b131da08-bc4b-4f09-812e-e871d00e2d15,
cd3789f3-aadd-451e-9453-63af8ca0911d,
2d8d311f-2398-48bf-8c31-78244bd75007,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db,
74777a72-fa7e-4298-943d-1a9bdb94a59e,
893c3bd2-a670-422b-b066-0c9e6af00478,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
28252f01-30e4-4331-bba9-8edf371247c2
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
CSS cache
CSS stylesheets are cached, and if that cache is shared between websites, it can be used to track users across sites.
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same first party:
fake_8869679409636486,
fake_8282827042063601,
fake_1501205927847431,
fake_844349908270823
result, different first party:
fake_37404032996256675,
fake_39532067990976416,
fake_9308324217564794,
fake_764063754569325
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same first party:
fake_5129586395462686,
fake_8346523749781609,
fake_9757505016328891,
fake_0063796014955028735,
fake_007638344812526565
result, different first party:
fake_2351836161115357,
fake_9001824410502415,
fake_8924276401941986,
fake_49513120273552613,
fake_7324543953943903
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same first party:
fake_917659863997965,
fake_798709153313659,
fake_9755205688553592
result, different first party:
fake_917659863997965,
fake_798709153313659,
fake_9755205688553592
unsupported: false, false, false
passed: false, false, false
test failed: false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same first party:
fake_8062553667832681,
fake_3208457285685926,
fake_3906673478717173,
fake_5618552573894693,
fake_2527230643352678
result, different first party:
fake_2576373794440998,
fake_2524685243925757,
fake_18781791238653867,
fake_007886234537582748,
fake_7532236991102947
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same first party:
fake_35357542685142795,
fake_33511436388765103,
fake_5974019293518746
result, different first party:
fake_009367307216838539,
fake_021771465392206535,
fake_444359486348479
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same first party:
fake_8515082183038052,
fake_3016714591779761,
fake_3585232939869072,
fake_5904508281042342,
fake_19923100767548396
result, different first party:
fake_342880122884752,
fake_7992694189766831,
fake_06548508809541231,
fake_46733959303058037,
fake_013678041899759519
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same first party:
fake_4542568481105034,
fake_8800599259351036,
fake_09788781703475657,
fake_10041443688945773,
fake_4966484178777506
result, different first party:
fake_4542568481105034,
fake_387478703777858,
fake_7709907240403813,
fake_10041443688945773,
fake_4966484178777506
unsupported: false, false, false, false, false
passed: false, true, true, false, false
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same first party:
fake_5068264823794184,
fake_6361259121978917,
fake_6461441434841615,
fake_29535867076690603,
fake_4461149233303363
result, different first party:
fake_18375686022334103,
fake_10101914747486251,
fake_3292289832062463,
fake_7882235013564309,
fake_10231138782729321
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same first party:
fake_22000860943722134,
fake_7687297737203844,
fake_0532586562054973,
fake_05042404766691333,
fake_1353416379182515
result, different first party:
fake_22000860943722134,
fake_7687297737203844,
fake_0532586562054973,
fake_05042404766691333,
fake_1353416379182515
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
favicon cache
A favicon is an icon that represents a website, typically shown in browser tab and bookmarks menu. If the favicon cache is not partitioned, it can be used to track users across websites.
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same first party: 1, 1, 1, 1
result, different first party: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same first party: 1, 1, 1
result, different first party: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same first party: 1, 1, 1
result, different first party: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same first party: 2, 2, 2, 2, 2
result, different first party: 3, 3, 3, 3, 3
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
fetch cache
When a resource is received via the Fetch API, it is frequently cached. That cache can potentially be abused for cross-site tracking.
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1
result, different first party: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1
result, different first party: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1
result, different first party: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
font cache
Web fonts are sometimes stored in their own cache, which is vulnerable to being abused for cross-site tracking.
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1
result, different first party: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1
result, different first party: 1, 1, 1
unsupported: false, false, false
passed: false, false, false
test failed: false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1
result, different first party: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 1, 2, 2, 1, 1
unsupported: false, false, false, false, false
passed: false, true, true, false, false
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
getDirectory
navigator.storage.getDirectory exposes a location for storing files to web content. In some cases, these files may be shared across tabs.
Passed
write: async (secret) => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt', { create: true });
          const stream = await fileHandle.createWritable();
          await stream.write(secret);
          await stream.close();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt');
          const file = await fileHandle.getFile();
          return file.text();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a,
d19de502-0304-4b31-a9bb-1b9e72c0f51e,
f8e2f297-52d1-4075-bf1f-e66acc780fbd,
9675e758-e2c4-4130-acb7-67ccb3ae4433
result, different first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (secret) => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt', { create: true });
          const stream = await fileHandle.createWritable();
          await stream.write(secret);
          await stream.close();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt');
          const file = await fileHandle.getFile();
          return file.text();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d,
01aefaa8-0431-400c-988e-1e1f7ba982a2,
c16dd0cb-2eec-4459-930e-0217f9358f39,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d,
dd31aac8-be49-4126-9b1a-f301e645dba3
result, different first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt', { create: true });
          const stream = await fileHandle.createWritable();
          await stream.write(secret);
          await stream.close();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt');
          const file = await fileHandle.getFile();
          return file.text();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0,
4cf6bd79-a682-476a-8d83-543566af5966,
9499e247-17ea-47f5-a207-44718b449f78
result, different first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt', { create: true });
          const stream = await fileHandle.createWritable();
          await stream.write(secret);
          await stream.close();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt');
          const file = await fileHandle.getFile();
          return file.text();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad,
2d665fbd-6aed-4dcb-9795-6b402ad715cf,
97cdd9bf-f365-46b9-a68c-6f50a80312c2,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9
result, different first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt', { create: true });
          const stream = await fileHandle.createWritable();
          await stream.write(secret);
          await stream.close();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt');
          const file = await fileHandle.getFile();
          return file.text();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
fc6c9ea8-266b-4041-ab82-7816d96decb6,
4658621f-e0d9-453c-9f17-1fdc982b3268
result, different first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Unsupported
write: async (secret) => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt', { create: true });
          const stream = await fileHandle.createWritable();
          await stream.write(secret);
          await stream.close();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt');
          const file = await fileHandle.getFile();
          return file.text();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
result, same first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
result, different first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt', { create: true });
          const stream = await fileHandle.createWritable();
          await stream.write(secret);
          await stream.close();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt');
          const file = await fileHandle.getFile();
          return file.text();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778,
15741f5b-efc4-4dd7-b942-c3fbf5b70949,
38ffa9bf-22f2-49d1-b3fc-569208060f22,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
result, different first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt', { create: true });
          const stream = await fileHandle.createWritable();
          await stream.write(secret);
          await stream.close();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt');
          const file = await fileHandle.getFile();
          return file.text();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
result, same first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
result, different first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt', { create: true });
          const stream = await fileHandle.createWritable();
          await stream.write(secret);
          await stream.close();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        try {
          const root = await navigator.storage.getDirectory();
          const fileHandle = await root.getFileHandle('secret.txt');
          const file = await fileHandle.getFile();
          return file.text();
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db,
74777a72-fa7e-4298-943d-1a9bdb94a59e,
893c3bd2-a670-422b-b066-0c9e6af00478,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
28252f01-30e4-4331-bba9-8edf371247c2
result, different first party:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
H1 connection
HTTP/1.x are the classic web connection protocols. If these connections are re-used across websites, they can be used to track users.
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h1.privacytests2.org:8901/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a,
d19de502-0304-4b31-a9bb-1b9e72c0f51e,
f8e2f297-52d1-4075-bf1f-e66acc780fbd,
9675e758-e2c4-4130-acb7-67ccb3ae4433
result, different first party: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h1.privacytests2.org:8901/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d,
01aefaa8-0431-400c-988e-1e1f7ba982a2,
c16dd0cb-2eec-4459-930e-0217f9358f39,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d,
dd31aac8-be49-4126-9b1a-f301e645dba3
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h1.privacytests2.org:8901/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0,
4cf6bd79-a682-476a-8d83-543566af5966,
9499e247-17ea-47f5-a207-44718b449f78
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h1.privacytests2.org:8901/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad,
2d665fbd-6aed-4dcb-9795-6b402ad715cf,
97cdd9bf-f365-46b9-a68c-6f50a80312c2,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h1.privacytests2.org:8901/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
fc6c9ea8-266b-4041-ab82-7816d96decb6,
4658621f-e0d9-453c-9f17-1fdc982b3268
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h1.privacytests2.org:8901/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
5372076f-3b55-4ff8-b265-cb8a9a54369f,
7c511f33-ee8a-4882-8d4c-c9a01f8db872,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6,
ab09d644-f080-47bd-b750-d1da1a205b91,
0c060fef-486b-40b4-86e7-0552c4a69628
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h1.privacytests2.org:8901/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778,
15741f5b-efc4-4dd7-b942-c3fbf5b70949,
38ffa9bf-22f2-49d1-b3fc-569208060f22,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h1.privacytests2.org:8901/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
41a8db60-b13d-42b6-9555-2ec1278f1356,
b131da08-bc4b-4f09-812e-e871d00e2d15,
cd3789f3-aadd-451e-9453-63af8ca0911d,
2d8d311f-2398-48bf-8c31-78244bd75007,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h1.privacytests2.org:8901/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db,
74777a72-fa7e-4298-943d-1a9bdb94a59e,
893c3bd2-a670-422b-b066-0c9e6af00478,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
28252f01-30e4-4331-bba9-8edf371247c2
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
H2 connection
HTTP/2 is a web connection protocol introduced in 2015. Some browsers re-use HTTP/2 connections across websites and can thus be used to track users.
Passed
write: async (secret) => {
        await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h2.privacytests2.org:8902/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a,
d19de502-0304-4b31-a9bb-1b9e72c0f51e,
f8e2f297-52d1-4075-bf1f-e66acc780fbd,
9675e758-e2c4-4130-acb7-67ccb3ae4433
result, different first party: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h2.privacytests2.org:8902/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d,
01aefaa8-0431-400c-988e-1e1f7ba982a2,
c16dd0cb-2eec-4459-930e-0217f9358f39,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d,
dd31aac8-be49-4126-9b1a-f301e645dba3
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h2.privacytests2.org:8902/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0,
4cf6bd79-a682-476a-8d83-543566af5966,
9499e247-17ea-47f5-a207-44718b449f78
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h2.privacytests2.org:8902/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad,
2d665fbd-6aed-4dcb-9795-6b402ad715cf,
97cdd9bf-f365-46b9-a68c-6f50a80312c2,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h2.privacytests2.org:8902/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
fc6c9ea8-266b-4041-ab82-7816d96decb6,
4658621f-e0d9-453c-9f17-1fdc982b3268
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h2.privacytests2.org:8902/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
5372076f-3b55-4ff8-b265-cb8a9a54369f,
7c511f33-ee8a-4882-8d4c-c9a01f8db872,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6,
ab09d644-f080-47bd-b750-d1da1a205b91,
0c060fef-486b-40b4-86e7-0552c4a69628
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h2.privacytests2.org:8902/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778,
15741f5b-efc4-4dd7-b942-c3fbf5b70949,
38ffa9bf-22f2-49d1-b3fc-569208060f22,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h2.privacytests2.org:8902/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
41a8db60-b13d-42b6-9555-2ec1278f1356,
b131da08-bc4b-4f09-812e-e871d00e2d15,
cd3789f3-aadd-451e-9453-63af8ca0911d,
2d8d311f-2398-48bf-8c31-78244bd75007,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h2.privacytests2.org:8902/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db,
74777a72-fa7e-4298-943d-1a9bdb94a59e,
893c3bd2-a670-422b-b066-0c9e6af00478,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
28252f01-30e4-4331-bba9-8edf371247c2
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
H3 connection
HTTP/3 is a new standard HTTP connection protocol, still in draft but widely supported by browsers. If it is not partitioned, it can be used to track users across websites.
Passed
write: async (secret) => {
      // Ensure that we can switch over to h3 via alt-svc:
        for (let i = 0; i < 3; ++i) {
          await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
          await sleepMs(500);
        }
        // Are we now connecting over h3?
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
        const text = await response.text();
        // Empty response text indicates we are not connecting over h3:
        if (text.trim() === '') {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id');
        return await response.text();
      }
result, same first party:
edf679355c867a2761d58bc133a0b519,
6bda54cbd079d45eef38250b1b7487c3,
629d2ab337d0922bef0b50cb9712b3d2,
1628f199c1b18af6858610157b79b56b
result, different first party: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Unsupported
write: async (secret) => {
      // Ensure that we can switch over to h3 via alt-svc:
        for (let i = 0; i < 3; ++i) {
          await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
          await sleepMs(500);
        }
        // Are we now connecting over h3?
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
        const text = await response.text();
        // Empty response text indicates we are not connecting over h3:
        if (text.trim() === '') {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id');
        return await response.text();
      }
result, same first party: , , , ,
result, different first party: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Ensure that we can switch over to h3 via alt-svc:
        for (let i = 0; i < 3; ++i) {
          await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
          await sleepMs(500);
        }
        // Are we now connecting over h3?
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
        const text = await response.text();
        // Empty response text indicates we are not connecting over h3:
        if (text.trim() === '') {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id');
        return await response.text();
      }
result, same first party:
f348f3debfba7af9bc16419f9c2d4585,
ac37b08df090085ee49c8e58d9d87408,
f2af9a8d72829bd64030d8dbff73b3bd
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Unsupported
write: async (secret) => {
      // Ensure that we can switch over to h3 via alt-svc:
        for (let i = 0; i < 3; ++i) {
          await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
          await sleepMs(500);
        }
        // Are we now connecting over h3?
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
        const text = await response.text();
        // Empty response text indicates we are not connecting over h3:
        if (text.trim() === '') {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id');
        return await response.text();
      }
result, same first party: , , , ,
result, different first party: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Ensure that we can switch over to h3 via alt-svc:
        for (let i = 0; i < 3; ++i) {
          await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
          await sleepMs(500);
        }
        // Are we now connecting over h3?
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
        const text = await response.text();
        // Empty response text indicates we are not connecting over h3:
        if (text.trim() === '') {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id');
        return await response.text();
      }
result, same first party:
7da148a4eec784ba62839465560e6e12,
01745228d5a3e64da62e03005cadea02,
d46b8d98c0b85eaa1b10d638f6fa1076
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
      // Ensure that we can switch over to h3 via alt-svc:
        for (let i = 0; i < 3; ++i) {
          await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
          await sleepMs(500);
        }
        // Are we now connecting over h3?
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
        const text = await response.text();
        // Empty response text indicates we are not connecting over h3:
        if (text.trim() === '') {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id');
        return await response.text();
      }
result, same first party:
73133ee7faf33e12df678045fc89c5b4,
acf69eab51bb1d08bc68cdd9809c019c,
87e2588aa51a48fb1a1087163d4d18f4,
0bf18237aebe14ff0763936bd6aac982,
4aea364851eafc17c6f9cba11454b83b
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Ensure that we can switch over to h3 via alt-svc:
        for (let i = 0; i < 3; ++i) {
          await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
          await sleepMs(500);
        }
        // Are we now connecting over h3?
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
        const text = await response.text();
        // Empty response text indicates we are not connecting over h3:
        if (text.trim() === '') {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id');
        return await response.text();
      }
result, same first party:
00e179750210afaa950a207b96af0aea,
4b4719b872440d4237b95ce7a4187f77,
04304c0f8fc81b23d9a8292fab7934a2,
10fe1048a8665de05c67caf67177a263,
3e9f90b939c4a4b2815ca3a2da604e07
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
      // Ensure that we can switch over to h3 via alt-svc:
        for (let i = 0; i < 3; ++i) {
          await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
          await sleepMs(500);
        }
        // Are we now connecting over h3?
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
        const text = await response.text();
        // Empty response text indicates we are not connecting over h3:
        if (text.trim() === '') {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id');
        return await response.text();
      }
result, same first party: , , , ,
result, different first party: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Ensure that we can switch over to h3 via alt-svc:
        for (let i = 0; i < 3; ++i) {
          await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
          await sleepMs(500);
        }
        // Are we now connecting over h3?
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id', { cache: 'no-store' });
        const text = await response.text();
        // Empty response text indicates we are not connecting over h3:
        if (text.trim() === '') {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const response = await fetch('https://h3.privacytests2.org:4434/connection_id');
        return await response.text();
      }
result, same first party:
7b0d7b0c2045d27c2cd9a0fcf9695119,
4ada183db4e1d6614a64a89bffeb4f83,
08e9810a49eb2f673e4e35cad0a9d19d,
4341d66db30eb699aa6e79e389400013,
0870b18020e7b0a7b5d0869fb823a7c1
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
HSTS cache

            
Passed
write: null
read: null
result, same first party: , , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , , ,
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: null
read: null
result, same first party: , , , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , , , ,
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: null
read: null
result, same first party: , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , ,
passed: true, true, true
test failed: false, false, false
Failed
write: set HSTS flag
read: read HSTS flag
result, same first party: not tested, not tested, not tested, not tested, not tested
result, different first party:
Upgraded to https,
Upgraded to https,
Upgraded to https,
Upgraded to https,
Upgraded to https
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: null
read: null
result, same first party: , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , ,
passed: true, true, true
test failed: false, false, false
Passed
write: set HSTS flag
read: read HSTS flag
result, same first party: not tested, not tested, not tested, not tested, not tested
result, different first party: Used http, Used http, Used http, Used http, Used http
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: null
read: null
result, same first party: , , , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , , , ,
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: null
read: null
result, same first party: , , , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , , , ,
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: null
read: null
result, same first party: , , , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , , , ,
passed: true, true, true, true, true
test failed: false, false, false, false, false
HSTS cache (fetch)

            
Passed
write: null
read: null
result, same first party: , , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , , ,
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: null
read: null
result, same first party: , , , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , , , ,
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: null
read: null
result, same first party: , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , ,
passed: true, true, true
test failed: false, false, false
Failed
write: set HSTS flag
read: read HSTS flag
result, same first party: not tested, not tested, not tested, not tested, not tested
result, different first party:
Upgraded to https,
Upgraded to https,
Upgraded to https,
Upgraded to https,
Upgraded to https
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: null
read: null
result, same first party: , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , ,
passed: true, true, true
test failed: false, false, false
Passed
write: set HSTS flag
read: read HSTS flag
result, same first party: not tested, not tested, not tested, not tested, not tested
result, different first party: Used http, Used http, Used http, Used http, Used http
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: null
read: null
result, same first party: , , , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , , , ,
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: null
read: null
result, same first party: , , , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , , , ,
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: null
read: null
result, same first party: , , , ,
result, different first party:
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected
unsupported: , , , ,
passed: true, true, true, true, true
test failed: false, false, false, false, false
iframe cache
An iframe is an element in a web page than allows websites to embed a second web page. Caching of this web page could be abused for cross-site tracking.
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1
result, different first party: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1
result, different first party: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1
result, different first party: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
image cache
Caching of images in web browsers is a standard behavior. But if that cache leaks between websites, it can be abused for cross-site tracking.
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1
result, different first party: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1
result, different first party: 1, 1, 1
unsupported: false, false, false
passed: false, false, false
test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1
result, different first party: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 1, 2, 2, 1, 1
unsupported: false, false, false, false, false
passed: false, true, true, false, false
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
indexedDB
The IndexedDB API exposes a transactional database to web pages. That database can be used to track users across websites, unless it is partitioned.
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a,
d19de502-0304-4b31-a9bb-1b9e72c0f51e,
f8e2f297-52d1-4075-bf1f-e66acc780fbd,
9675e758-e2c4-4130-acb7-67ccb3ae4433
result, different first party: undefined
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d,
01aefaa8-0431-400c-988e-1e1f7ba982a2,
c16dd0cb-2eec-4459-930e-0217f9358f39,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d,
dd31aac8-be49-4126-9b1a-f301e645dba3
result, different first party: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0,
4cf6bd79-a682-476a-8d83-543566af5966,
9499e247-17ea-47f5-a207-44718b449f78
result, different first party: undefined
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad,
2d665fbd-6aed-4dcb-9795-6b402ad715cf,
97cdd9bf-f365-46b9-a68c-6f50a80312c2,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9
result, different first party: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
fc6c9ea8-266b-4041-ab82-7816d96decb6,
4658621f-e0d9-453c-9f17-1fdc982b3268
result, different first party: undefined
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same first party:
5372076f-3b55-4ff8-b265-cb8a9a54369f,
7c511f33-ee8a-4882-8d4c-c9a01f8db872,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6,
ab09d644-f080-47bd-b750-d1da1a205b91,
0c060fef-486b-40b4-86e7-0552c4a69628
result, different first party: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778,
15741f5b-efc4-4dd7-b942-c3fbf5b70949,
38ffa9bf-22f2-49d1-b3fc-569208060f22,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
result, different first party: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same first party:
41a8db60-b13d-42b6-9555-2ec1278f1356,
b131da08-bc4b-4f09-812e-e871d00e2d15,
cd3789f3-aadd-451e-9453-63af8ca0911d,
2d8d311f-2398-48bf-8c31-78244bd75007,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48
result, different first party:
Error: IDBFactory.open: The operation is insecure,
Error: IDBFactory.open: The operation is insecure,
Error: IDBFactory.open: The operation is insecure,
Error: IDBFactory.open: The operation is insecure,
Error: IDBFactory.open: The operation is insecure
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db,
74777a72-fa7e-4298-943d-1a9bdb94a59e,
893c3bd2-a670-422b-b066-0c9e6af00478,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
28252f01-30e4-4331-bba9-8edf371247c2
result, different first party: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
localStorage
The localStorage API gives websites access to a key-value database that will remain available across visits. If the localStorage API is not partitioned or blocked, it can also be used to track users across websites.
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a,
d19de502-0304-4b31-a9bb-1b9e72c0f51e,
f8e2f297-52d1-4075-bf1f-e66acc780fbd,
9675e758-e2c4-4130-acb7-67ccb3ae4433
result, different first party: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d,
01aefaa8-0431-400c-988e-1e1f7ba982a2,
c16dd0cb-2eec-4459-930e-0217f9358f39,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d,
dd31aac8-be49-4126-9b1a-f301e645dba3
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0,
4cf6bd79-a682-476a-8d83-543566af5966,
9499e247-17ea-47f5-a207-44718b449f78
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad,
2d665fbd-6aed-4dcb-9795-6b402ad715cf,
97cdd9bf-f365-46b9-a68c-6f50a80312c2,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
fc6c9ea8-266b-4041-ab82-7816d96decb6,
4658621f-e0d9-453c-9f17-1fdc982b3268
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same first party:
5372076f-3b55-4ff8-b265-cb8a9a54369f,
7c511f33-ee8a-4882-8d4c-c9a01f8db872,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6,
ab09d644-f080-47bd-b750-d1da1a205b91,
0c060fef-486b-40b4-86e7-0552c4a69628
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778,
15741f5b-efc4-4dd7-b942-c3fbf5b70949,
38ffa9bf-22f2-49d1-b3fc-569208060f22,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same first party:
41a8db60-b13d-42b6-9555-2ec1278f1356,
b131da08-bc4b-4f09-812e-e871d00e2d15,
cd3789f3-aadd-451e-9453-63af8ca0911d,
2d8d311f-2398-48bf-8c31-78244bd75007,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48
result, different first party:
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db,
74777a72-fa7e-4298-943d-1a9bdb94a59e,
893c3bd2-a670-422b-b066-0c9e6af00478,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
28252f01-30e4-4331-bba9-8edf371247c2
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
locks
navigator.locks (only supported in some browsers) allows scripts on multiple tabs to coordinate. If this API is not partitioned, it can be used for cross-site tracking.
Passed
write: async (key) => {
        if (navigator.locks) {
          navigator.locks.request(key, lock => new Promise((resolve) => {}));
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].clientId;
        } else {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (navigator.locks) {
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].name;
        }
      }
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a,
d19de502-0304-4b31-a9bb-1b9e72c0f51e,
f8e2f297-52d1-4075-bf1f-e66acc780fbd,
9675e758-e2c4-4130-acb7-67ccb3ae4433
result, different first party:
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        if (navigator.locks) {
          navigator.locks.request(key, lock => new Promise((resolve) => {}));
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].clientId;
        } else {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (navigator.locks) {
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].name;
        }
      }
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d,
01aefaa8-0431-400c-988e-1e1f7ba982a2,
c16dd0cb-2eec-4459-930e-0217f9358f39,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d,
dd31aac8-be49-4126-9b1a-f301e645dba3
result, different first party:
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        if (navigator.locks) {
          navigator.locks.request(key, lock => new Promise((resolve) => {}));
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].clientId;
        } else {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (navigator.locks) {
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].name;
        }
      }
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0,
4cf6bd79-a682-476a-8d83-543566af5966,
9499e247-17ea-47f5-a207-44718b449f78
result, different first party:
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        if (navigator.locks) {
          navigator.locks.request(key, lock => new Promise((resolve) => {}));
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].clientId;
        } else {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (navigator.locks) {
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].name;
        }
      }
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad,
2d665fbd-6aed-4dcb-9795-6b402ad715cf,
97cdd9bf-f365-46b9-a68c-6f50a80312c2,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9
result, different first party:
Error: undefined is not an object (evaluating 'queryResult.held[0].name'),
Error: undefined is not an object (evaluating 'queryResult.held[0].name'),
Error: undefined is not an object (evaluating 'queryResult.held[0].name'),
Error: undefined is not an object (evaluating 'queryResult.held[0].name'),
Error: undefined is not an object (evaluating 'queryResult.held[0].name')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        if (navigator.locks) {
          navigator.locks.request(key, lock => new Promise((resolve) => {}));
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].clientId;
        } else {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (navigator.locks) {
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].name;
        }
      }
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
fc6c9ea8-266b-4041-ab82-7816d96decb6,
4658621f-e0d9-453c-9f17-1fdc982b3268
result, different first party:
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        if (navigator.locks) {
          navigator.locks.request(key, lock => new Promise((resolve) => {}));
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].clientId;
        } else {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (navigator.locks) {
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].name;
        }
      }
result, same first party:
5372076f-3b55-4ff8-b265-cb8a9a54369f,
7c511f33-ee8a-4882-8d4c-c9a01f8db872,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6,
ab09d644-f080-47bd-b750-d1da1a205b91,
0c060fef-486b-40b4-86e7-0552c4a69628
result, different first party:
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        if (navigator.locks) {
          navigator.locks.request(key, lock => new Promise((resolve) => {}));
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].clientId;
        } else {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (navigator.locks) {
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].name;
        }
      }
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778,
15741f5b-efc4-4dd7-b942-c3fbf5b70949,
38ffa9bf-22f2-49d1-b3fc-569208060f22,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
result, different first party:
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        if (navigator.locks) {
          navigator.locks.request(key, lock => new Promise((resolve) => {}));
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].clientId;
        } else {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (navigator.locks) {
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].name;
        }
      }
result, same first party:
41a8db60-b13d-42b6-9555-2ec1278f1356,
b131da08-bc4b-4f09-812e-e871d00e2d15,
cd3789f3-aadd-451e-9453-63af8ca0911d,
2d8d311f-2398-48bf-8c31-78244bd75007,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48
result, different first party:
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        if (navigator.locks) {
          navigator.locks.request(key, lock => new Promise((resolve) => {}));
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].clientId;
        } else {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (navigator.locks) {
          const queryResult = await navigator.locks.query();
          return queryResult.held[0].name;
        }
      }
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db,
74777a72-fa7e-4298-943d-1a9bdb94a59e,
893c3bd2-a670-422b-b066-0c9e6af00478,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
28252f01-30e4-4331-bba9-8edf371247c2
result, different first party:
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
prefetch cache
A <link rel='prefetch'...> suggests to browsers they should fetch a resource ahead of time and cache it. But if browsers don't partition this cache, it can be used to track users across websites.
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same first party: 1, 1, 1, 1
result, different first party: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same first party: 1, 1, 1
result, different first party: 1, 1, 1
unsupported: false, false, false
passed: false, false, false
test failed: false, false, false
Unsupported
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same first party:
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received
result, different first party:
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same first party: 1, 1, 1
result, different first party: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 1, 2, 2, 1, 1
unsupported: false, false, false, false, false
passed: false, true, true, false, false
test failed: false, false, false, false, false
Unsupported
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same first party:
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received
result, different first party:
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Failed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
script cache
Caching of scripts in web browsers is a standard behavior. But if that cache leaks between websites, it can be abused for cross-site tracking.
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1
result, different first party: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1
result, different first party: 1, 1, 1
unsupported: false, false, false
passed: false, false, false
test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1
result, different first party: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 1, 2, 2, 1, 1
unsupported: false, false, false, false, false
passed: false, true, true, false, false
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
SharedWorker
The SharedWorker API allows scripts from multiple tabs to share a background thread of computation. If SharedWorker is not partitioned, then it can be abused to shared data between websites in your browser.
Passed
write: async (secret) => {
        try {
          const worker = new window.SharedWorker('supercookies_sharedworker.js');
          worker.port.start();
          //        console.log("worker", worker);
          const messagePromise = new Promise((resolve) => {
            worker.port.onmessage = (e) => resolve(e.data);
          });
          worker.port.postMessage(secret);
          await messagePromise;
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const worker = new window.SharedWorker('supercookies_sharedworker.js');
        worker.port.start();
        const messagePromise = new Promise((resolve, reject) => {
          worker.port.onmessage = (e) => resolve(e.data);
          setTimeout(() => reject(new Error('no SharedWorker message received')), 200);
        });
        worker.port.postMessage('request');
        const message = await messagePromise;
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same' && message === 'none') {
          throw new Error('Unsupported');
        }
        return message;
      }
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a,
d19de502-0304-4b31-a9bb-1b9e72c0f51e,
f8e2f297-52d1-4075-bf1f-e66acc780fbd,
9675e758-e2c4-4130-acb7-67ccb3ae4433
result, different first party: none, none, none, none
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (secret) => {
        try {
          const worker = new window.SharedWorker('supercookies_sharedworker.js');
          worker.port.start();
          //        console.log("worker", worker);
          const messagePromise = new Promise((resolve) => {
            worker.port.onmessage = (e) => resolve(e.data);
          });
          worker.port.postMessage(secret);
          await messagePromise;
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const worker = new window.SharedWorker('supercookies_sharedworker.js');
        worker.port.start();
        const messagePromise = new Promise((resolve, reject) => {
          worker.port.onmessage = (e) => resolve(e.data);
          setTimeout(() => reject(new Error('no SharedWorker message received')), 200);
        });
        worker.port.postMessage('request');
        const message = await messagePromise;
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same' && message === 'none') {
          throw new Error('Unsupported');
        }
        return message;
      }
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d,
01aefaa8-0431-400c-988e-1e1f7ba982a2,
c16dd0cb-2eec-4459-930e-0217f9358f39,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d,
dd31aac8-be49-4126-9b1a-f301e645dba3
result, different first party:
Error: no SharedWorker message received,
Error: no SharedWorker message received,
Error: no SharedWorker message received,
Error: no SharedWorker message received,
Error: no SharedWorker message received
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          const worker = new window.SharedWorker('supercookies_sharedworker.js');
          worker.port.start();
          //        console.log("worker", worker);
          const messagePromise = new Promise((resolve) => {
            worker.port.onmessage = (e) => resolve(e.data);
          });
          worker.port.postMessage(secret);
          await messagePromise;
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const worker = new window.SharedWorker('supercookies_sharedworker.js');
        worker.port.start();
        const messagePromise = new Promise((resolve, reject) => {
          worker.port.onmessage = (e) => resolve(e.data);
          setTimeout(() => reject(new Error('no SharedWorker message received')), 200);
        });
        worker.port.postMessage('request');
        const message = await messagePromise;
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same' && message === 'none') {
          throw new Error('Unsupported');
        }
        return message;
      }
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0,
4cf6bd79-a682-476a-8d83-543566af5966,
9499e247-17ea-47f5-a207-44718b449f78
result, different first party: none, none, none
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
        try {
          const worker = new window.SharedWorker('supercookies_sharedworker.js');
          worker.port.start();
          //        console.log("worker", worker);
          const messagePromise = new Promise((resolve) => {
            worker.port.onmessage = (e) => resolve(e.data);
          });
          worker.port.postMessage(secret);
          await messagePromise;
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const worker = new window.SharedWorker('supercookies_sharedworker.js');
        worker.port.start();
        const messagePromise = new Promise((resolve, reject) => {
          worker.port.onmessage = (e) => resolve(e.data);
          setTimeout(() => reject(new Error('no SharedWorker message received')), 200);
        });
        worker.port.postMessage('request');
        const message = await messagePromise;
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same' && message === 'none') {
          throw new Error('Unsupported');
        }
        return message;
      }
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad,
2d665fbd-6aed-4dcb-9795-6b402ad715cf,
97cdd9bf-f365-46b9-a68c-6f50a80312c2,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9
result, different first party: none, none, none, none, none
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          const worker = new window.SharedWorker('supercookies_sharedworker.js');
          worker.port.start();
          //        console.log("worker", worker);
          const messagePromise = new Promise((resolve) => {
            worker.port.onmessage = (e) => resolve(e.data);
          });
          worker.port.postMessage(secret);
          await messagePromise;
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const worker = new window.SharedWorker('supercookies_sharedworker.js');
        worker.port.start();
        const messagePromise = new Promise((resolve, reject) => {
          worker.port.onmessage = (e) => resolve(e.data);
          setTimeout(() => reject(new Error('no SharedWorker message received')), 200);
        });
        worker.port.postMessage('request');
        const message = await messagePromise;
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same' && message === 'none') {
          throw new Error('Unsupported');
        }
        return message;
      }
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
fc6c9ea8-266b-4041-ab82-7816d96decb6,
4658621f-e0d9-453c-9f17-1fdc982b3268
result, different first party: none, none, none
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
        try {
          const worker = new window.SharedWorker('supercookies_sharedworker.js');
          worker.port.start();
          //        console.log("worker", worker);
          const messagePromise = new Promise((resolve) => {
            worker.port.onmessage = (e) => resolve(e.data);
          });
          worker.port.postMessage(secret);
          await messagePromise;
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const worker = new window.SharedWorker('supercookies_sharedworker.js');
        worker.port.start();
        const messagePromise = new Promise((resolve, reject) => {
          worker.port.onmessage = (e) => resolve(e.data);
          setTimeout(() => reject(new Error('no SharedWorker message received')), 200);
        });
        worker.port.postMessage('request');
        const message = await messagePromise;
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same' && message === 'none') {
          throw new Error('Unsupported');
        }
        return message;
      }
result, same first party:
5372076f-3b55-4ff8-b265-cb8a9a54369f,
7c511f33-ee8a-4882-8d4c-c9a01f8db872,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6,
ab09d644-f080-47bd-b750-d1da1a205b91,
0c060fef-486b-40b4-86e7-0552c4a69628
result, different first party: none, none, none, none, none
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          const worker = new window.SharedWorker('supercookies_sharedworker.js');
          worker.port.start();
          //        console.log("worker", worker);
          const messagePromise = new Promise((resolve) => {
            worker.port.onmessage = (e) => resolve(e.data);
          });
          worker.port.postMessage(secret);
          await messagePromise;
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const worker = new window.SharedWorker('supercookies_sharedworker.js');
        worker.port.start();
        const messagePromise = new Promise((resolve, reject) => {
          worker.port.onmessage = (e) => resolve(e.data);
          setTimeout(() => reject(new Error('no SharedWorker message received')), 200);
        });
        worker.port.postMessage('request');
        const message = await messagePromise;
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same' && message === 'none') {
          throw new Error('Unsupported');
        }
        return message;
      }
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778,
15741f5b-efc4-4dd7-b942-c3fbf5b70949,
38ffa9bf-22f2-49d1-b3fc-569208060f22,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
result, different first party: none, none, none, none, none
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          const worker = new window.SharedWorker('supercookies_sharedworker.js');
          worker.port.start();
          //        console.log("worker", worker);
          const messagePromise = new Promise((resolve) => {
            worker.port.onmessage = (e) => resolve(e.data);
          });
          worker.port.postMessage(secret);
          await messagePromise;
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const worker = new window.SharedWorker('supercookies_sharedworker.js');
        worker.port.start();
        const messagePromise = new Promise((resolve, reject) => {
          worker.port.onmessage = (e) => resolve(e.data);
          setTimeout(() => reject(new Error('no SharedWorker message received')), 200);
        });
        worker.port.postMessage('request');
        const message = await messagePromise;
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same' && message === 'none') {
          throw new Error('Unsupported');
        }
        return message;
      }
result, same first party:
41a8db60-b13d-42b6-9555-2ec1278f1356,
b131da08-bc4b-4f09-812e-e871d00e2d15,
cd3789f3-aadd-451e-9453-63af8ca0911d,
2d8d311f-2398-48bf-8c31-78244bd75007,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48
result, different first party:
Error: SharedWorker constructor: StorageAccess denied.,
Error: SharedWorker constructor: StorageAccess denied.,
Error: SharedWorker constructor: StorageAccess denied.,
Error: SharedWorker constructor: StorageAccess denied.,
Error: SharedWorker constructor: StorageAccess denied.
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          const worker = new window.SharedWorker('supercookies_sharedworker.js');
          worker.port.start();
          //        console.log("worker", worker);
          const messagePromise = new Promise((resolve) => {
            worker.port.onmessage = (e) => resolve(e.data);
          });
          worker.port.postMessage(secret);
          await messagePromise;
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const worker = new window.SharedWorker('supercookies_sharedworker.js');
        worker.port.start();
        const messagePromise = new Promise((resolve, reject) => {
          worker.port.onmessage = (e) => resolve(e.data);
          setTimeout(() => reject(new Error('no SharedWorker message received')), 200);
        });
        worker.port.postMessage('request');
        const message = await messagePromise;
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same' && message === 'none') {
          throw new Error('Unsupported');
        }
        return message;
      }
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db,
74777a72-fa7e-4298-943d-1a9bdb94a59e,
893c3bd2-a670-422b-b066-0c9e6af00478,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
28252f01-30e4-4331-bba9-8edf371247c2
result, different first party: none, none, none, none, none
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
TLS Session ID
The TLS protocol is used by HTTPS to make connections secure. If the browser were to re-use a TLS session, then the session ID could be used to track users across websites.
Passed
write: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
read: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
result, same first party:
6225daa9ced63cdc5fdc6a0a6bd01fbc85e31ccc44c8af1767d61e0890848bb2,
da7ee75c43994485b9eb48173e56f4f13bc0f341067c52628a071d96afb34150,
42b05a46b3d5888a7d83eca9bd3c071668503134bdb86107d140065d19da2dce,
99edee1b9d6c03f8b887ce00a13486e3168647de2b97fee9306c153c2e5de85b
result, different first party:
db8c2005cbd06a96770ead7f5ac7a59dffbe11b6db7dbe39a92cb8ef7b0f21ac,
34eaaa957a3798091170d98ffa0b025f16e41fe6d84201d64ac8342de1c9b558,
767209bc233c1e30b6acd3b1f27394d04bfa62afdcbec1999dcd21f4dd16d25a,
9aa64b91b7230887a0178472e280d0ee2e8c4819053e65eb0657880a8078d9ab
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
read: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
result, same first party:
b82635e159c3a206a061890392cf04f5c51b665850019c13e1cb4b3db0bb4697,
2422ea7099f7d8c31595dbb87cc85dde8b81d5de984b32a77ff808b9a832984d,
3214539677478653b93261149abc7ae6449c2eec31b407bb806dd14933f98163,
17b5076cb5ce4d02856f1fc7e14ddea58859d016616e9067fb80697f73241e59,
f17a02f3836e38dfa634883322e3d9030642f5d8aa73ff750786967bab38f40d
result, different first party:
64ebaecd69041fca73e4e2480ae7212cb5f670704f28f5d2b8c8004c43cb7124,
84dd13ce56a66564be80f3b79885a3a9afe105e36c54e96badbb4520f004f39f,
e25a6532e73bda0a30153dccc2c3db799d11cd2da110138074196830114a37f5,
f87bd8baffe7d6167f5704f68326a74f7a8975c5bcd5960649729df8a6d689e8,
13fdeb514262247b8e5abd997edd0e188ed1a901db29398f5b7b49f0a542a63d
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
read: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
result, same first party:
354588a7b409d93f9ffe1f409595bac2bf1d5ab1d8c5bbadd65a670e5c9ea3a5,
99a33e2feb28b2f07f6a276cb8996afd7bf88ab3a8b1d817d81b1654b787b33e,
eae6f2d652cce2978ae13a5a5c155ca113cd10936eddf5741ad2906c8aec2b46
result, different first party:
7552ba32c1db6e57a97d98f4b2c965a6e0e56b4b8397c5edc0b0376a69945ac7,
e3d40fe91a4f13105210e96f4d2ef65cd6467658680240a789ff5f18b4508b03,
df032a0d951b1739e74367571a93fc717ff38c8505ed877a07f7b2aec4b25436
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
read: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
result, same first party:
1998dc913130e6d647e86797828deacd46a2ced4c8cb7ac4437a736a167375ce,
26a115a429d541482312fd7633a2d156880538a197f4af82a08a5b1fd2666bbc,
b8a6b44b2af233cdded13a59e17ca4b55568f89feb07a6496c08f17079ddd111,
e7882a2f2175ed60aa18bef2e3f106ac67a21487c6b9de85eff82aa08cba8cc4,
d00224f6d7f1d2a3485105740a669af29d8f13d571bdb6727a0591e5d4796958
result, different first party:
9c735f16ae318378e86448dbcc68f9c26437b9d91995fbbde2dbe651671c4c6a,
83e0ca78b08bb318e23ed6e8d87d9ad2b45bb6149e88e1cb737651848031b1b3,
a33be925992dc4f20fc10608595dc2e2b53b4db9be91e1525d65b79942764034,
454d712bb5438456f3da198341059c8c2ae963d23d059d089650d6efc4fc09a3,
08e0cff24cb3d71c1f9310007eee38994bab6ba59cee00eda0cb816a77e87c7b
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
read: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
result, same first party:
edb58ab8f74ab3e249ab9d7200af09c8ef3ee807710551ec5cd72aa843c359ed,
944dde000fe2fb6d300a23227fa7a8722115efdca999f5eaff36946d8d559851,
4d46587cd4d128da70cce58363ea73a645c60a97d3b017898731b334b6a394e9
result, different first party:
aa6297b3c1f68cdce8deadcfb8762c2fc218794c693b30deb78dd3b0110c1555,
90441ab984ca222352d5574417926d71ac3a45bc68a9496f9db566b822772264,
3c62c88f277ca13a8fb0bc937f3e4f80d3d81a1a9feaaab88a62b202d0566951
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
read: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
result, same first party:
0a6c25c86743aeef3fd5767748930fa1f02f843d4429e6d1f0d463fa78eaac73,
3c4ecfa851aa2318bbcace12e461f7650920439c844c551ee41038cf87e14678,
968fdde43488899379a0d55ca389d695f623815906b878226332f0b468589931,
2c7fd7269d0af33c10043a162a828ab1b35332605f1ec248bf9eac86d410acae,
6fd79efd0beedeca28af0ef78a3bee852f5ab44efb99fcb3f2800622e397c7c8
result, different first party:
20c6dac11bb8c14f3b6a679ef6f1768e5f352ffac261cba7e01649e173f36997,
0172ab9c2e0e2aacdc203400c90e187674b507938d8ee3ad1c937b9bbae71120,
ab397af36b1d7d6a097d6051f9560241cbab75fd5bac96aafed18df43826ff9e,
95fba015231dc34f8f1f1ae5441200423ec6432670bd01401028275827d16a64,
d64450353a8937fd9dcd9bd5245b6d6ecba18152e1a2eda87b82f2145766b532
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
read: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
result, same first party:
6effe9a721242385f4ce04bec38822a11f5a3f9e9faf1b422118a935292768a0,
c8ec31f3c9c274aa4ab534dec21c27b77b495053d4d1ae584d8f31283bc324b9,
662d90be23865001f1b75a61ae52b08a2611fc5aecb73306c32981d14f39fc8a,
36e4aef4ab3a4f9c8ef79f024e13cb2d9b42dacdcb5202e72ce430198b37c1a7,
5fd6930f76a5ef3d8b8dba20897f8cca061bbe87785b9b16b1366b0457d478a0
result, different first party:
ad44773f06f26a929c7ad726c403f79924885e2e033d462d84b4346cd175dca4,
8e3883edd6fd6639d6074edd5eebe3a7adc959ade77a5c6c88babd84be982603,
fc2719b57db1b0c2383a93d9ca08996c3d258caa9118b2ec724f88e964e97b2a,
903d3e20add95818b02363139b42b7b2f40b4c0f3b1c0c54b613258e61be7c39,
80350760a87e7304351781f0ce595577d3771d31187eaeea4ef902e76413535a
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
read: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
result, same first party:
18d67c2bc4bb5b4649008b567c26149a7f4d22399a78eb2738be81f15e83ef57,
0ade3f3909a85d395632796c4002ae4023c3c36d0770e27307cd6660ec60aa09,
a1d86d3ebd19f6c200aaa5c97ac403b0d5be28374be19d4f220150cb7a1e18a4,
9a42cf5d39b687589f161ceabdde22730e3fff3e83ad31becd3b36c539d266f1,
67d6ba84a17b2e70a26ba263684a08a74d52b2ca79e60d769a6b6c7ab964623e
result, different first party:
397ff6a6cd98a1d3855b6bb8a2f2526cbad2b678414058f4c083d755e28b5a32,
825a687cc3651600e6985a87e70770ef392bd124a61688a877352ac3bc6d6276,
3898ab94593fa9069d2f81bccfa493b3f2100cd52772cee09bd34a6912a1905f,
37f29b376448151c41dea692520217cd8d6ac52967304e82d89089818a22d3ca,
27ac9d2bf5bc042b02d47e20afefa414b145092d64f365940dbe24c2455d9488
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
read: async () => {
        const results = await fetch('https://tls.privacytests2.org:8900/');
        return (await results.json()).sessionId;
      }
result, same first party:
21f528f3cb925773a6d6306d3dff1714f9690c79b945d27421e81ee13557dca1,
51e4bc8ba4862f0777ccc0a68c8730ffa6ac74c60a16f5c6aaf5645288cf6cd0,
81a36cc963a1a56023dd9ac396f6878619ed5e84604bb4d4a772b3e6141d098f,
4d4c2cd09aae612e460c0ce7b50085c1e430ad9d1a31c1c409410b21ebff8db0,
2055e131491147454827dd7ba920e756884c9077e1416cf43ad41d7de9f2be3e
result, different first party:
b1f138753dfe009d3b754225dc868ad0cc729144fcd156ff9a051a91be9ef27f,
28f229a3710acd0d71037489a3eccd9de034b7e1516434f574e492683e492029,
7b1f7d43cf7acbd0dac46fdc46d4ddefaae9399644bc3c5eccc4dd0d75c5c654,
939507f0bb07f7ad55de128f19b33fc7d5b9bea7fce26d5520a6d863c66cf636,
4aa754adb5048ae91945b3302a3b4c24ab26015beb89f075e9c0523908ac4475
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
XMLHttpRequest cache
Similar to the newer Fetch API, any resource received may be cached by the browser. The cache is potentially vulnerable to cross-site tracking attack.
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1
result, different first party: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1
result, different first party: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1
result, different first party: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same first party: 1, 1, 1, 1, 1
result, different first party: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Navigation testsWhich browsers prevent websites from sharing tracking data when you click on a link?
When you click a hyperlink to navigate your browser from one site to another, certain browser APIs allow the first site to communicate to the second site. These privacy vulnerabilities can be fixed by introducing new limits on how much data is transfered between sites.',
document.referrer
The Referer [sic] request header is a mechanism used by browsers to let a website know where the user is visiting from. This header is inherently tracking users across websites. In recent times, browsers have switched to a policy of trimming a referrer to convey less tracking information, but Referer continues to convey cross-site tracking data by default.
Failed
write: (secret) => { /* do nothing */ }
read: () => document.referrer
result, same first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
result, different first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
unsupported: false, false, false, false
passed: false, false, false, false
test failed: false, false, false, false
Failed
write: (secret) => { /* do nothing */ }
read: () => document.referrer
result, same first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
result, different first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => { /* do nothing */ }
read: () => document.referrer
result, same first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
result, different first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
unsupported: false, false, false
passed: false, false, false
test failed: false, false, false
Failed
write: (secret) => { /* do nothing */ }
read: () => document.referrer
result, same first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
result, different first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => { /* do nothing */ }
read: () => document.referrer
result, same first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
result, different first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
unsupported: false, false, false
passed: false, false, false
test failed: false, false, false
Failed
write: (secret) => { /* do nothing */ }
read: () => document.referrer
result, same first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
result, different first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => { /* do nothing */ }
read: () => document.referrer
result, same first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
result, different first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => { /* do nothing */ }
read: () => document.referrer
result, same first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
result, different first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => { /* do nothing */ }
read: () => document.referrer
result, same first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
result, different first party:
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
sessionStorage
The sessionStorage API is similar to the localStorage API, but it does not persist across tabs or across browser sessions. Nonetheless, it can be used to track users if they navigate from one website to another. This tracking can be thwarted by partitioning sessionStorage between websites.
Passed
write: (secret) => window.sessionStorage.setItem('secret', secret)
read: () => window.sessionStorage.getItem('secret')
result, same first party:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a,
d19de502-0304-4b31-a9bb-1b9e72c0f51e,
f8e2f297-52d1-4075-bf1f-e66acc780fbd,
9675e758-e2c4-4130-acb7-67ccb3ae4433
result, different first party: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (secret) => window.sessionStorage.setItem('secret', secret)
read: () => window.sessionStorage.getItem('secret')
result, same first party:
4c33e845-f58e-469d-9853-1fec8aa5c41d,
01aefaa8-0431-400c-988e-1e1f7ba982a2,
c16dd0cb-2eec-4459-930e-0217f9358f39,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d,
dd31aac8-be49-4126-9b1a-f301e645dba3
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => window.sessionStorage.setItem('secret', secret)
read: () => window.sessionStorage.getItem('secret')
result, same first party:
0abce94a-eab1-40f6-9274-9a91cd87a8f0,
4cf6bd79-a682-476a-8d83-543566af5966,
9499e247-17ea-47f5-a207-44718b449f78
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => window.sessionStorage.setItem('secret', secret)
read: () => window.sessionStorage.getItem('secret')
result, same first party:
a6868889-b914-4496-b110-32f1bc2984ad,
2d665fbd-6aed-4dcb-9795-6b402ad715cf,
97cdd9bf-f365-46b9-a68c-6f50a80312c2,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => window.sessionStorage.setItem('secret', secret)
read: () => window.sessionStorage.getItem('secret')
result, same first party:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
fc6c9ea8-266b-4041-ab82-7816d96decb6,
4658621f-e0d9-453c-9f17-1fdc982b3268
result, different first party: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => window.sessionStorage.setItem('secret', secret)
read: () => window.sessionStorage.getItem('secret')
result, same first party:
5372076f-3b55-4ff8-b265-cb8a9a54369f,
7c511f33-ee8a-4882-8d4c-c9a01f8db872,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6,
ab09d644-f080-47bd-b750-d1da1a205b91,
0c060fef-486b-40b4-86e7-0552c4a69628
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => window.sessionStorage.setItem('secret', secret)
read: () => window.sessionStorage.getItem('secret')
result, same first party:
eb573f77-6e72-4761-bc54-4b1096222778,
15741f5b-efc4-4dd7-b942-c3fbf5b70949,
38ffa9bf-22f2-49d1-b3fc-569208060f22,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => window.sessionStorage.setItem('secret', secret)
read: () => window.sessionStorage.getItem('secret')
result, same first party:
41a8db60-b13d-42b6-9555-2ec1278f1356,
b131da08-bc4b-4f09-812e-e871d00e2d15,
cd3789f3-aadd-451e-9453-63af8ca0911d,
2d8d311f-2398-48bf-8c31-78244bd75007,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => window.sessionStorage.setItem('secret', secret)
read: () => window.sessionStorage.getItem('secret')
result, same first party:
95ac96dd-ea93-4960-a931-1a095efa61db,
74777a72-fa7e-4298-943d-1a9bdb94a59e,
893c3bd2-a670-422b-b066-0c9e6af00478,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
28252f01-30e4-4331-bba9-8edf371247c2
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
window.name
The window.name API allows websites to store data that will persist after the user has navigated the tab to a different website. This mechanism could be partitioned so that data is not allowed to persist between websites.
Passed
write: (secret) => { window.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_9149ed0c-20d2-4ba8-8ae6-744720f18b1a,
name_d19de502-0304-4b31-a9bb-1b9e72c0f51e,
name_f8e2f297-52d1-4075-bf1f-e66acc780fbd,
name_9675e758-e2c4-4130-acb7-67ccb3ae4433
result, different first party: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (secret) => { window.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_4c33e845-f58e-469d-9853-1fec8aa5c41d,
name_01aefaa8-0431-400c-988e-1e1f7ba982a2,
name_c16dd0cb-2eec-4459-930e-0217f9358f39,
name_61c8523f-f2ab-4d29-bfea-51e78f4b0d1d,
name_dd31aac8-be49-4126-9b1a-f301e645dba3
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: (secret) => { window.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_0abce94a-eab1-40f6-9274-9a91cd87a8f0,
name_4cf6bd79-a682-476a-8d83-543566af5966,
name_9499e247-17ea-47f5-a207-44718b449f78
result, different first party:
name_0abce94a-eab1-40f6-9274-9a91cd87a8f0,
name_4cf6bd79-a682-476a-8d83-543566af5966,
name_9499e247-17ea-47f5-a207-44718b449f78
unsupported: false, false, false
passed: false, false, false
test failed: false, false, false
Passed
write: (secret) => { window.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_a6868889-b914-4496-b110-32f1bc2984ad,
name_2d665fbd-6aed-4dcb-9795-6b402ad715cf,
name_97cdd9bf-f365-46b9-a68c-6f50a80312c2,
name_bbce3f2b-974f-456f-9f07-a5ea3344a5dd,
name_91e2455c-2121-4f68-abcd-6b4bbe9c3df9
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: (secret) => { window.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
name_fc6c9ea8-266b-4041-ab82-7816d96decb6,
name_4658621f-e0d9-453c-9f17-1fdc982b3268
result, different first party:
name_ac2c0ca4-296f-45ae-969a-f9f6bb73ca96,
name_fc6c9ea8-266b-4041-ab82-7816d96decb6,
name_4658621f-e0d9-453c-9f17-1fdc982b3268
unsupported: false, false, false
passed: false, false, false
test failed: false, false, false
Passed
write: (secret) => { window.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_5372076f-3b55-4ff8-b265-cb8a9a54369f,
name_7c511f33-ee8a-4882-8d4c-c9a01f8db872,
name_281673a1-d9fa-4c7e-8cfe-5ea2468547f6,
name_ab09d644-f080-47bd-b750-d1da1a205b91,
name_0c060fef-486b-40b4-86e7-0552c4a69628
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: (secret) => { window.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_eb573f77-6e72-4761-bc54-4b1096222778,
name_15741f5b-efc4-4dd7-b942-c3fbf5b70949,
name_38ffa9bf-22f2-49d1-b3fc-569208060f22,
name_56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
name_e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
result, different first party:
name_eb573f77-6e72-4761-bc54-4b1096222778,
name_15741f5b-efc4-4dd7-b942-c3fbf5b70949,
name_38ffa9bf-22f2-49d1-b3fc-569208060f22,
name_56ec3dd5-7303-4ad0-a525-5f2a03667ae0,
name_e8f22c8a-94aa-49e1-bc4c-09bcc268fc38
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (secret) => { window.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_41a8db60-b13d-42b6-9555-2ec1278f1356,
name_b131da08-bc4b-4f09-812e-e871d00e2d15,
name_cd3789f3-aadd-451e-9453-63af8ca0911d,
name_2d8d311f-2398-48bf-8c31-78244bd75007,
name_3f957e99-9b22-4fe6-9c92-d10aa92b1f48
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: (secret) => { window.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_95ac96dd-ea93-4960-a931-1a095efa61db,
name_74777a72-fa7e-4298-943d-1a9bdb94a59e,
name_893c3bd2-a670-422b-b066-0c9e6af00478,
name_8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
name_28252f01-30e4-4331-bba9-8edf371247c2
result, different first party:
name_95ac96dd-ea93-4960-a931-1a095efa61db,
name_74777a72-fa7e-4298-943d-1a9bdb94a59e,
name_893c3bd2-a670-422b-b066-0c9e6af00478,
name_8b9993f5-e52f-42d6-9ae6-287ea1c8bff9,
name_28252f01-30e4-4331-bba9-8edf371247c2
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
HTTPS testsWhich browsers prevent unencrypted network connections?
HTTPS is the protocol that web browsers use to connect securely to websites. When HTTPS is being used, the connection is encrypted so that third parties on the network cannot read content being sent between the server and your browser. In the past, insecure connections were the default and websites would need to actively request that a browser use HTTPS. Now the status quo is shifting, and browser makers are moving toward a world where HTTPS is the default protocol.`
Insecure website warning

            
Passed
passed: true, true, true, true
result:
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded
Passed
passed: true, true, true, true, true
result:
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded
Passed
passed: true, true, true
result:
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded
Failed
passed: false, false, false, false, false
result:
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded
Passed
passed: true, true, true
result:
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded
Failed
passed: false, false, false, false, false
result:
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded
Passed
passed: true, true, true, true, true
result:
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded
Passed
passed: true, true, true, true, true
result:
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded
Passed
passed: true, true, true, true, true
result:
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded,
Insecure website never loaded
Upgradable address
Checks to see if an insecure address entered into the browser's address bar is upgraded to HTTPS whenever possible.
Passed
upgraded: true, true, true, true
passed: true, true, true, true
Passed
upgraded: true, true, true, true, true
passed: true, true, true, true, true
Passed
upgraded: true, true, true
passed: true, true, true
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
Passed
upgraded: true, true, true
passed: true, true, true
Passed
upgraded: true, true, true, true, true
passed: true, true, true, true, true
Passed
upgraded: true, true, true, true, true
passed: true, true, true, true, true
Passed
upgraded: true, true, true, true, true
passed: true, true, true, true, true
Passed
upgraded: true, true, true, true, true
passed: true, true, true, true, true
Upgradable hyperlink
Checks to see if the user has clicked on a hyperlink to an insecure address, if the browser upgrades that address to HTTPS whenever possible.
Passed
upgraded: true, true, true, true
passed: true, true, true, true
Passed
upgraded: true, true, true, true, true
passed: true, true, true, true, true
Passed
upgraded: true, true, true
passed: true, true, true
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
Passed
upgraded: true, true, true
passed: true, true, true
Passed
upgraded: true, true, true, true, true
passed: true, true, true, true, true
Passed
upgraded: true, true, true, true, true
passed: true, true, true, true, true
Passed
upgraded: true, true, true, true, true
passed: true, true, true, true, true
Passed
upgraded: true, true, true, true, true
passed: true, true, true, true, true
Upgradable image
Checks to see if the browser attempts to upgrade an insecure address for an image to HTTPS whenever possible.
Passed
passed: true, true, true, true
result: upgraded, upgraded, upgraded, upgraded
Passed
passed: true, true, true, true, true
result: upgraded, upgraded, upgraded, upgraded, upgraded
Passed
passed: true, true, true
result: upgraded, upgraded, upgraded
Passed
passed: true, true, true, true, true
result: upgraded, upgraded, upgraded, upgraded, upgraded
Passed
passed: true, true, true
result: upgraded, upgraded, upgraded
Passed
passed: true, true, true, true, true
result: upgraded, upgraded, upgraded, upgraded, upgraded
Passed
passed: true, true, true, true, true
result: upgraded, upgraded, upgraded, upgraded, upgraded
Passed
passed: true, true, true, true, true
result: upgraded, upgraded, upgraded, upgraded, upgraded
Passed
passed: true, true, true, true, true
result: upgraded, upgraded, upgraded, upgraded, upgraded
Upgradable script
Checks to see if the browser attempts to upgrade an insecure address for an script to HTTPS whenever possible.
Passed
passed: true, true, true, true
result: blocked, blocked, blocked, blocked
Passed
passed: true, true, true, true, true
result: blocked, blocked, blocked, blocked, blocked
Passed
passed: true, true, true
result: blocked, blocked, blocked
Passed
passed: true, true, true, true, true
result: blocked, blocked, blocked, blocked, blocked
Passed
passed: true, true, true
result: blocked, blocked, blocked
Passed
passed: true, true, true, true, true
result: blocked, blocked, blocked, blocked, blocked
Passed
passed: true, true, true, true, true
result: blocked, blocked, blocked, blocked, blocked
Passed
passed: true, true, true, true, true
result: upgraded, upgraded, upgraded, upgraded, upgraded
Passed
passed: true, true, true, true, true
result: blocked, blocked, blocked, blocked, blocked
Misc testsWhich browsers provide additional assorted privacy protections?
This category includes tests for the presence of miscellaneous privacy features
ECH enabled
Encrypted Client Hello (ECH) is a new protocol that hides the website you are visiting from third-party network eavesdroppers.
Passed
SNI_status: encrypted
passed: true, true, true, true
Failed
SNI_status: plaintext
passed: false, false, false, false, false
Passed
SNI_status: encrypted
passed: true, true, true
Failed
SNI_status: plaintext
passed: false, false, false, false, false
Passed
SNI_status: encrypted
passed: true, true, true
Passed
SNI_status: encrypted
passed: true, true, true, true, true
Passed
SNI_status: encrypted
passed: true, true, true, true, true
Failed
SNI_status: plaintext
passed: false, false, false, false, false
Passed
SNI_status: encrypted
passed: true, true, true, true, true
GPC enabled first-party
The Global Privacy Control is an HTTP header that can be sent by a browser to instruct a website not to sell the user's personal data to third parties. This test checks to see if the GPC header is sent by default to the top-level website.
Passed
header value: 1
passed: true, true, true, true
Passed
header value: 1
passed: true, true, true, true, true
Failed
header value: undefined
passed: false, false, false
Passed
header value: 1
passed: true, true, true, true, true
Failed
header value: undefined
passed: false, false, false
Passed
header value: 1
passed: true, true, true, true, true
Failed
header value: undefined
passed: false, false, false, false, false
Passed
header value: 1
passed: true, true, true, true, true
Failed
header value: undefined
passed: false, false, false, false, false
GPC enabled third-party
The Global Privacy Control is an HTTP header that can be sent by a browser to instruct a visited website not to sell the user's personal data to other parties. This test checks to see if the GPC header is sent to third-party elements on the web page.
Passed
sec-gpc: 1
passed: true, true, true, true
Passed
sec-gpc: 1
passed: true, true, true, true, true
Failed
passed: false, false, false
Failed
passed: false, false, false, false, false
Failed
passed: false, false, false
Passed
sec-gpc: 1
passed: true, true, true, true, true
Failed
passed: false, false, false, false, false
Passed
sec-gpc: 1
passed: true, true, true, true, true
Failed
passed: false, false, false, false, false
IP address hidden
IP addresses can be used to uniquely identify a large percentage of users. A proxy, VPN, or Tor can mask a user's IP address.
Failed
passed: false, true, false, false
Passed
passed: true, true, true, true, true
Passed
passed: true, true, true
Failed
passed: true, true, false, false, true
Failed
passed: false, true, false
Failed
passed: true, false, true, false, false
Failed
passed: true, false, false, true, false
Passed
passed: true, true, true, true, true
Failed
passed: false, false, true, false, true
Stream isolation
Browsers that use Tor can use a different Tor circuit per top-level website.
Unsupported
write: () => {
        if (!usingTor) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (usingTor) {
          return ipAddress;
        } else {
          throw new Error('Unsupported');
        }
      }
unsupported: true, true, true, true
readSameFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
readDifferentFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
testFailed: false, false, false, false
Passed
write: () => {
        if (!usingTor) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (usingTor) {
          return ipAddress;
        } else {
          throw new Error('Unsupported');
        }
      }
unsupported: false, false, false, false, false
readSameFirstParty:
5.45.98.162,
192.42.116.43,
185.220.100.242,
109.70.100.2,
192.42.116.94
readDifferentFirstParty:
23.129.64.214,
45.84.107.97,
37.77.56.238,
45.66.35.35,
107.189.11.111
passed: true, true, true, true, true
testFailed: false, false, false, false, false
Unsupported
write: () => {
        if (!usingTor) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (usingTor) {
          return ipAddress;
        } else {
          throw new Error('Unsupported');
        }
      }
unsupported: true, true, true
readSameFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
readDifferentFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
testFailed: false, false, false
Unsupported
write: () => {
        if (!usingTor) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (usingTor) {
          return ipAddress;
        } else {
          throw new Error('Unsupported');
        }
      }
unsupported: true, true, true, true, true
readSameFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
readDifferentFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
testFailed: false, false, false, false, false
Unsupported
write: () => {
        if (!usingTor) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (usingTor) {
          return ipAddress;
        } else {
          throw new Error('Unsupported');
        }
      }
unsupported: true, true, true
readSameFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
readDifferentFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
testFailed: false, false, false
Unsupported
write: () => {
        if (!usingTor) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (usingTor) {
          return ipAddress;
        } else {
          throw new Error('Unsupported');
        }
      }
unsupported: true, true, true, true, true
readSameFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
readDifferentFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
testFailed: false, false, false, false, false
Unsupported
write: () => {
        if (!usingTor) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (usingTor) {
          return ipAddress;
        } else {
          throw new Error('Unsupported');
        }
      }
unsupported: true, true, true, true, true
readSameFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
readDifferentFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
testFailed: false, false, false, false, false
Passed
write: () => {
        if (!usingTor) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (usingTor) {
          return ipAddress;
        } else {
          throw new Error('Unsupported');
        }
      }
unsupported: false, false, false, false, false
readSameFirstParty:
2001:67c:e60:c0c:192:42:116:93,
2a0b:f4c2::29,
37.228.129.162,
2001:67c:e60:c0c:192:42:116:96,
2001:620:20d0::24
readDifferentFirstParty:
2a03:94e0:ffff:185:243:218:0:233,
2a0b:f4c0:16c:13::1,
2a03:e600:100::9,
45.9.168.107,
2a03:94e0:ffff:185:243:218:0:230
passed: true, true, true, true, true
testFailed: false, false, false, false, false
Unsupported
write: () => {
        if (!usingTor) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        if (usingTor) {
          return ipAddress;
        } else {
          throw new Error('Unsupported');
        }
      }
unsupported: true, true, true, true, true
readSameFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
readDifferentFirstParty:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
testFailed: false, false, false, false, false
Tor enabled
The Tor network sends the browser's web requests through a series of relays to hide a user's IP address, thereby helping to mask their identity and location. This test checks to see if the Tor network is being used by default.
Failed
IsTorExit: false, false, false, false
passed: false, false, false, false
Passed
IsTorExit: true, true, true, true, true
passed: true, true, true, true, true
Failed
IsTorExit: false, false, false
passed: false, false, false
Failed
IsTorExit: false, false, false, false, false
passed: false, false, false, false, false
Failed
IsTorExit: false, false, false
passed: false, false, false
Failed
IsTorExit: false, false, false, false, false
passed: false, false, false, false, false
Failed
IsTorExit: false, false, false, false, false
passed: false, false, false, false, false
Passed
IsTorExit: true, true, true, true, true
passed: true, true, true, true, true
Failed
IsTorExit: false, false, false, false, false
passed: false, false, false, false, false
Fingerprinting resistance testsWhich browsers hide what's unique about your device?
Fingerprinting is a technique trackers use to uniquely identify you as you browse the web. A fingerprinting script will measure several characteristics of your browser and, combining this data, will build a fingerprint that may uniquely identify you among web users. Browsers can introduce countermeasures, such as minimizing the distinguishing information disclosed by certain web APIs so your browser is harder to pick out from the crowd (so-called 'fingerprinting resistance').`,
System font detection
Web pages can detect the presence of a font installed on the user's system. The presence or absence of various fonts is commonly used to fingerprint users.
Passed
expression: undefined
desired expression: undefined
actual value: undefined
desired value: undefined
passed: true,true,true,true
Passed
expression: undefined
desired expression: undefined
actual value: undefined
desired value: undefined
passed: true,true,true,true,true
Failed
expression: undefined
desired expression: undefined
actual value: undefined
desired value: undefined
passed: false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: undefined
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: undefined
desired value: undefined
passed: false,false,false
Passed
expression: undefined
desired expression: undefined
actual value: undefined
desired value: undefined
passed: true,true,true,true,true
Failed
expression: undefined
desired expression: undefined
actual value: undefined
desired value: undefined
passed: false,false,false,false,false
Passed
expression: undefined
desired expression: undefined
actual value: undefined
desired value: undefined
passed: true,true,true,true,true
Failed
expression: undefined
desired expression: undefined
actual value: undefined
desired value: undefined
passed: false,false,false,false,false
Tracking query parameter testsWhich browsers remove URL parameters that can track you?
When you browse from one web page to another, tracking companies will frequently attach a 'tracking query parameter' to the address of the second web page. That query parameter may contain a unique identifier that tracks you individually as you browse the web. And these query parameters are frequently synchronized with cookies, making them a powerful tracking vector. Web browsers can protect you from known tracking query parameters by stripping them from web addresses before your browser sends them. (The set of tracking query parameters tested here was largely borrowed from Brave.)`
__hsfp
HubSpot tracking parameter
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
__hssc
HubSpot tracking parameter
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
__hstc
HubSpot tracking parameter
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
__s
Drip.com email address tracking parameter
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
_hsenc
HubSpot tracking parameter
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
_openstat
Yandex tracking parameter
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
dclid
DoubleClick Click ID (Google)
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
fbclid
Facebook Click Identifier
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
gclid
Google Click Identifier
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
hsCtaTracking
HubSpot tracking parameter
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
mc_eid
Mailchimp Email ID (email recipient's address)
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
mkt_tok
Adobe Marketo tracking parameter
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
ml_subscriber
MailerLite email tracking
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
ml_subscriber_hash
MailerLite email tracking
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
msclkid
Microsoft Click ID
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
oly_anon_id
Omeda marketing 'anonymous' customer id
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
oly_enc_id
Omeda marketing 'known' customer id
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
rb_clickid
Unknown high-entropy tracking parameter
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
s_cid
Adobe Site Catalyst tracking parameter
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
vero_conv
Vero tracking parameter
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
vero_id
Vero tracking parameter
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
wickedid
Wicked Reports e-commerce tracking
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
yclid
Yandex Click ID
Passed
passed: true, true, true, true
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Failed
value: 5928221229057715
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5928221229057715
passed: false, false, false, false, false
Tracker content blocking testsWhich browsers block important known tracking scripts and pixels?
When you visit a web page, it frequently has third-party embedded tracking content, such as scripts and tracking pixels. These embedded components spy on you. Some browsers and browser extensions maintain list of tracking companies and block their content from being loaded. This section checks to see if a browser blocks 20 of the largest trackers listed by https://whotracks.me.`
Adobe
Tests whether the browser blocks the page from loading the tracker at https://munchkin.marketo.net/munchkin.js
Passed
url: https://munchkin.marketo.net/munchkin.js
passed: true, true, true, true
Passed
url: https://munchkin.marketo.net/munchkin.js
passed: true, true, true, true, true
Failed
url: https://munchkin.marketo.net/munchkin.js
passed: false
Passed
url: https://munchkin.marketo.net/munchkin.js
passed: true, true, true, true, true
Passed
url: https://munchkin.marketo.net/munchkin.js
Passed
url: https://munchkin.marketo.net/munchkin.js
passed: true, true, true, true, true
Passed
url: https://munchkin.marketo.net/munchkin.js
Passed
url: https://munchkin.marketo.net/munchkin.js
Passed
url: https://munchkin.marketo.net/munchkin.js
Adobe Audience Manager
Tests whether the browser blocks the page from loading the tracker at https://dpm.demdex.net/ibs
Passed
url: https://dpm.demdex.net/ibs
passed: true, true, true, true
Passed
url: https://dpm.demdex.net/ibs
passed: true, true, true, true, true
Failed
url: https://dpm.demdex.net/ibs
passed: , false, false
Passed
url: https://dpm.demdex.net/ibs
passed: true, true, true, true, true
Failed
url: https://dpm.demdex.net/ibs
passed: false, false, false
Passed
url: https://dpm.demdex.net/ibs
passed: true, true, true, true, true
Failed
url: https://dpm.demdex.net/ibs
passed: false, false
Failed
url: https://dpm.demdex.net/ibs
passed: false, false, false, false, false
Failed
url: https://dpm.demdex.net/ibs
passed: false, false, false
Amazon adsystem
Tests whether the browser blocks the page from loading the tracker at https://s.amazon-adsystem.com/dcm
Passed
url: https://s.amazon-adsystem.com/dcm
passed: true, true, true, true
Passed
url: https://s.amazon-adsystem.com/dcm
passed: true, true, true, true, true
Failed
url: https://s.amazon-adsystem.com/dcm
passed: , false
Passed
url: https://s.amazon-adsystem.com/dcm
passed: true, true, true, true, true
Failed
url: https://s.amazon-adsystem.com/dcm
passed: , false
Passed
url: https://s.amazon-adsystem.com/dcm
passed: true, true, true, true, true
Failed
url: https://s.amazon-adsystem.com/dcm
passed: false, false, false, false
Failed
url: https://s.amazon-adsystem.com/dcm
passed: , false, false, false
Failed
url: https://s.amazon-adsystem.com/dcm
passed: false, false, false, false, false
AppNexus
Tests whether the browser blocks the page from loading the tracker at https://ib.adnxs.com/px?id=178248&t=1
Passed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: true, true, true, true
Passed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: true, true, true, true, true
Failed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: false, false, false
Passed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: true, true, true, true, true
Failed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: false, false, false
Passed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: true, true, true, true, true
Failed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: false, false, false
Failed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: , false, false, false, false
Failed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: false, false, false, false, false
Bing Ads
Tests whether the browser blocks the page from loading the tracker at https://bat.bing.com/bat.js
Passed
url: https://bat.bing.com/bat.js
passed: true, true, true, true
Passed
url: https://bat.bing.com/bat.js
passed: true, true, true, true, true
Failed
url: https://bat.bing.com/bat.js
passed: , false
Passed
url: https://bat.bing.com/bat.js
passed: true, true, true, true, true
Failed
url: https://bat.bing.com/bat.js
passed: , false
Passed
url: https://bat.bing.com/bat.js
passed: true, true, true, true, true
Failed
url: https://bat.bing.com/bat.js
passed: false
Failed
url: https://bat.bing.com/bat.js
passed: , false
Failed
url: https://bat.bing.com/bat.js
passed: false, false, false
Chartbeat
Tests whether the browser blocks the page from loading the tracker at https://static.chartbeat.com/js/chartbeat.js
Passed
url: https://static.chartbeat.com/js/chartbeat.js
passed: true, true, true, true
Passed
url: https://static.chartbeat.com/js/chartbeat.js
passed: true, true, true, true, true
Failed
url: https://static.chartbeat.com/js/chartbeat.js
passed: false, false, false
Failed
url: https://static.chartbeat.com/js/chartbeat.js
passed: false, false, false, false, false
Failed
url: https://static.chartbeat.com/js/chartbeat.js
passed: false, false, false
Passed
url: https://static.chartbeat.com/js/chartbeat.js
passed: true, true, true, true, true
Failed
url: https://static.chartbeat.com/js/chartbeat.js
passed: false, false, false, false, false
Failed
url: https://static.chartbeat.com/js/chartbeat.js
passed: false, false, false, false, false
Failed
url: https://static.chartbeat.com/js/chartbeat.js
passed: false, false, false, false, false
Criteo
Tests whether the browser blocks the page from loading the tracker at https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
Passed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: true, true, true, true
Passed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: true, true, true, true, true
Failed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: , false
Passed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: true, true, true, true, true
Failed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: , false
Passed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: true, true, true, true, true
Failed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: false, false, false, false
Failed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: false, false, false, false, false
Failed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: false, false, false
DoubleClick (Google)
Tests whether the browser blocks the page from loading the tracker at https://securepubads.g.doubleclick.net/static/glade.js
Passed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: true, true, true, true
Passed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: true, true, true, true, true
Passed
url: https://securepubads.g.doubleclick.net/static/glade.js
Passed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: true, true, true, true, true
Passed
url: https://securepubads.g.doubleclick.net/static/glade.js
Passed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: true, true, true, true, true
Failed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: false
Passed
url: https://securepubads.g.doubleclick.net/static/glade.js
Failed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: , false
Facebook tracking
Tests whether the browser blocks the page from loading the tracker at https://connect.facebook.net/en_US/fbevents.js
Passed
url: https://connect.facebook.net/en_US/fbevents.js
passed: true, true, true, true
Passed
url: https://connect.facebook.net/en_US/fbevents.js
passed: true, true, true, true, true
Failed
url: https://connect.facebook.net/en_US/fbevents.js
passed: false, false, false
Passed
url: https://connect.facebook.net/en_US/fbevents.js
passed: true, true, true, true, true
Failed
url: https://connect.facebook.net/en_US/fbevents.js
passed: false, false, false
Passed
url: https://connect.facebook.net/en_US/fbevents.js
passed: true, true, true, true, true
Failed
url: https://connect.facebook.net/en_US/fbevents.js
passed: false, false, false, false, false
Failed
url: https://connect.facebook.net/en_US/fbevents.js
passed: false, false, false, false, false
Failed
url: https://connect.facebook.net/en_US/fbevents.js
passed: false, false, false, false, false
Google (third-party ad pixel)
Tests whether the browser blocks the page from loading the tracker at https://www.google.com/pagead/1p-user-list/
Passed
url: https://www.google.com/pagead/1p-user-list/
passed: true, true, true, true
Passed
url: https://www.google.com/pagead/1p-user-list/
passed: true, true, true, true, true
Passed
url: https://www.google.com/pagead/1p-user-list/
Passed
url: https://www.google.com/pagead/1p-user-list/
passed: true, true, true, true, true
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: , false
Passed
url: https://www.google.com/pagead/1p-user-list/
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: false
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: , false
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: false, false, false
Google Analytics
Tests whether the browser blocks the page from loading the tracker at https://google-analytics.com/urchin.js
Passed
url: https://google-analytics.com/urchin.js
passed: true, true, true, true
Passed
url: https://google-analytics.com/urchin.js
passed: true, true, true, true, true
Failed
url: https://google-analytics.com/urchin.js
passed: , false
Passed
url: https://google-analytics.com/urchin.js
passed: true, true, true, true, true
Failed
url: https://google-analytics.com/urchin.js
passed: false, false, false
Passed
url: https://google-analytics.com/urchin.js
passed: true, true, true, true, true
Failed
url: https://google-analytics.com/urchin.js
passed: false, false
Failed
url: https://google-analytics.com/urchin.js
passed: , false
Failed
url: https://google-analytics.com/urchin.js
passed: false, false, false, false
Google Tag Manager
Tests whether the browser blocks the page from loading the tracker at https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
Passed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: true, true, true, true
Passed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: true, true, true, true, true
Failed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: false, false
Passed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: true, true, true, true, true
Failed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: , false
Passed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
Failed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: false, false
Failed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: false, false, false
Failed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: false, false, false, false, false
Index Exchange
Tests whether the browser blocks the page from loading the tracker at https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
Passed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: true, true, true, true
Passed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: true, true, true, true, true
Passed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
Passed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: true, true, true, true, true
Passed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
Passed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: true, true, true, true, true
Failed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: false
Failed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: false, false, false, false, false
Failed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: false, false
New Relic
Tests whether the browser blocks the page from loading the tracker at https://js-agent.newrelic.com/nr-1212.min.js
Passed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: true, true, true, true
Passed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: true, true, true, true, true
Failed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: false, false, false
Passed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: true, true, true, true, true
Failed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: false, false, false
Passed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: true, true, true, true, true
Failed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: false, false, false, false
Failed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: , false, false, false, false
Failed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: false, false, false, false
Quantcast
Tests whether the browser blocks the page from loading the tracker at https://pixel.quantserve.com/pixel
Passed
url: https://pixel.quantserve.com/pixel
passed: true, true, true, true
Passed
url: https://pixel.quantserve.com/pixel
passed: true, true, true, true, true
Failed
url: https://pixel.quantserve.com/pixel
passed: false, false
Passed
url: https://pixel.quantserve.com/pixel
passed: true, true, true, true, true
Failed
url: https://pixel.quantserve.com/pixel
passed: , false
Passed
url: https://pixel.quantserve.com/pixel
passed: true, true, true, true, true
Passed
url: https://pixel.quantserve.com/pixel
Failed
url: https://pixel.quantserve.com/pixel
passed: false, false, false, false, false
Passed
url: https://pixel.quantserve.com/pixel
Scorecard Research Beacon
Tests whether the browser blocks the page from loading the tracker at https://sb.scorecardresearch.com/internal-c2/default/cs.js
Passed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: true, true, true, true
Passed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: true, true, true, true, true
Passed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
Passed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: true, true, true, true, true
Passed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
Passed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: true, true, true, true, true
Passed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
Failed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: , false
Passed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
Taboola
Tests whether the browser blocks the page from loading the tracker at https://trc.taboola.com/futureplc-tomsguide/trc/3/json
Passed
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
passed: true, true, true, true
Passed
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
passed: true, true, true, true, true
Failed
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
passed: false, false, false
Passed
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
passed: true, true, true, true, true
Failed
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
passed: false, false, false
Passed
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
passed: true, true, true, true, true
Failed
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
passed: false, false, false, false, false
Failed
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
passed: , false
Failed
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
passed: false, false, false, false, false
Twitter pixel
Tests whether the browser blocks the page from loading the tracker at https://t.co/i/adsct
Passed
url: https://t.co/i/adsct
passed: true, true, true, true
Passed
url: https://t.co/i/adsct
passed: true, true, true, true, true
Failed
url: https://t.co/i/adsct
passed: false, false
Passed
url: https://t.co/i/adsct
passed: true, true, true, true, true
Failed
url: https://t.co/i/adsct
passed: , false
Passed
url: https://t.co/i/adsct
passed: true, true, true, true, true
Failed
url: https://t.co/i/adsct
passed: false
Failed
url: https://t.co/i/adsct
passed: false, false, false, false, false
Failed
url: https://t.co/i/adsct
passed: false, false, false, false, false
Yandex Ads
Tests whether the browser blocks the page from loading the tracker at https://yandex.ru/ads/system/header-bidding.js
Passed
url: https://yandex.ru/ads/system/header-bidding.js
passed: true, true, true, true
Passed
url: https://yandex.ru/ads/system/header-bidding.js
passed: true, true, true, true, true
Failed
url: https://yandex.ru/ads/system/header-bidding.js
passed: false, false, false
Failed
url: https://yandex.ru/ads/system/header-bidding.js
passed: false, false, false, false, false
Failed
url: https://yandex.ru/ads/system/header-bidding.js
passed: false, false, false
Passed
url: https://yandex.ru/ads/system/header-bidding.js
passed: true, true, true, true, true
Failed
url: https://yandex.ru/ads/system/header-bidding.js
passed: false, false, false, false, false
Failed
url: https://yandex.ru/ads/system/header-bidding.js
passed: false, false, false, false, false
Failed
url: https://yandex.ru/ads/system/header-bidding.js
passed: false, false, false, false, false
Tracking cookie protection testsWhich browsers block important known tracking cookies?
A large fraction of web pages on the web have hidden third-party trackers that read and write cookies in your browser. These cookies can be used to track your browsing across websites. This section checks to see if a browser stops cross-site tracking by cookies from 20 of the largest trackers listed by https://whotracks.me.`,
Adobe
Tests whether the browser stops cookies from munchkin.marketo.net from tracking users across websites.
Passed
passed: true, true, true, true
url: https://munchkin.marketo.net/munchkin.js
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://munchkin.marketo.net/munchkin.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://munchkin.marketo.net/munchkin.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://munchkin.marketo.net/munchkin.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://munchkin.marketo.net/munchkin.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://munchkin.marketo.net/munchkin.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://munchkin.marketo.net/munchkin.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://munchkin.marketo.net/munchkin.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://munchkin.marketo.net/munchkin.js
cookieFound: false, false, false, false, false
Adobe Audience Manager
Tests whether the browser stops cookies from dpm.demdex.net from tracking users across websites.
Passed
passed: true, true, true, true
url: https://dpm.demdex.net/ibs
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://dpm.demdex.net/ibs
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://dpm.demdex.net/ibs
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://dpm.demdex.net/ibs
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://dpm.demdex.net/ibs
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://dpm.demdex.net/ibs
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://dpm.demdex.net/ibs
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://dpm.demdex.net/ibs
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://dpm.demdex.net/ibs
cookieFound: false, false, false, false, false
Amazon adsystem
Tests whether the browser stops cookies from s.amazon-adsystem.com from tracking users across websites.
Passed
passed: true, true, true, true
url: https://s.amazon-adsystem.com/dcm
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://s.amazon-adsystem.com/dcm
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://s.amazon-adsystem.com/dcm
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://s.amazon-adsystem.com/dcm
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://s.amazon-adsystem.com/dcm
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://s.amazon-adsystem.com/dcm
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://s.amazon-adsystem.com/dcm
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://s.amazon-adsystem.com/dcm
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://s.amazon-adsystem.com/dcm
cookieFound: false, false, false, false, false
AppNexus
Tests whether the browser stops cookies from ib.adnxs.com from tracking users across websites.
Passed
passed: true, true, true, true
url: https://ib.adnxs.com/px?id=178248&t=1
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://ib.adnxs.com/px?id=178248&t=1
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://ib.adnxs.com/px?id=178248&t=1
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://ib.adnxs.com/px?id=178248&t=1
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://ib.adnxs.com/px?id=178248&t=1
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://ib.adnxs.com/px?id=178248&t=1
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://ib.adnxs.com/px?id=178248&t=1
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://ib.adnxs.com/px?id=178248&t=1
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://ib.adnxs.com/px?id=178248&t=1
cookieFound: false, false, false, false, false
Bing Ads
Tests whether the browser stops cookies from bat.bing.com from tracking users across websites.
Passed
passed: true, true, true, true
url: https://bat.bing.com/bat.js
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://bat.bing.com/bat.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://bat.bing.com/bat.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://bat.bing.com/bat.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://bat.bing.com/bat.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://bat.bing.com/bat.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://bat.bing.com/bat.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://bat.bing.com/bat.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://bat.bing.com/bat.js
cookieFound: false, false, false, false, false
Chartbeat
Tests whether the browser stops cookies from static.chartbeat.com from tracking users across websites.
Passed
passed: true, true, true, true
url: https://static.chartbeat.com/js/chartbeat.js
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://static.chartbeat.com/js/chartbeat.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://static.chartbeat.com/js/chartbeat.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://static.chartbeat.com/js/chartbeat.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://static.chartbeat.com/js/chartbeat.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://static.chartbeat.com/js/chartbeat.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://static.chartbeat.com/js/chartbeat.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://static.chartbeat.com/js/chartbeat.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://static.chartbeat.com/js/chartbeat.js
cookieFound: false, false, false, false, false
Criteo
Tests whether the browser stops cookies from dis.criteo.com from tracking users across websites.
Passed
passed: true, true, true, true
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
cookieFound: false, false, false, false, false
DoubleClick (Google)
Tests whether the browser stops cookies from securepubads.g.doubleclick.net from tracking users across websites.
Passed
passed: true, true, true, true
url: https://securepubads.g.doubleclick.net/static/glade.js
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://securepubads.g.doubleclick.net/static/glade.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://securepubads.g.doubleclick.net/static/glade.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://securepubads.g.doubleclick.net/static/glade.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://securepubads.g.doubleclick.net/static/glade.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://securepubads.g.doubleclick.net/static/glade.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://securepubads.g.doubleclick.net/static/glade.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://securepubads.g.doubleclick.net/static/glade.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://securepubads.g.doubleclick.net/static/glade.js
cookieFound: false, false, false, false, false
Facebook tracking
Tests whether the browser stops cookies from connect.facebook.net from tracking users across websites.
Passed
passed: true, true, true, true
url: https://connect.facebook.net/en_US/fbevents.js
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://connect.facebook.net/en_US/fbevents.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://connect.facebook.net/en_US/fbevents.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://connect.facebook.net/en_US/fbevents.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://connect.facebook.net/en_US/fbevents.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://connect.facebook.net/en_US/fbevents.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://connect.facebook.net/en_US/fbevents.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://connect.facebook.net/en_US/fbevents.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://connect.facebook.net/en_US/fbevents.js
cookieFound: false, false, false, false, false
Google (third-party ad pixel)
Tests whether the browser stops cookies from www.google.com from tracking users across websites.
Passed
passed: true, true, true, true
url: https://www.google.com/pagead/1p-user-list/
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://www.google.com/pagead/1p-user-list/
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://www.google.com/pagead/1p-user-list/
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://www.google.com/pagead/1p-user-list/
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://www.google.com/pagead/1p-user-list/
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://www.google.com/pagead/1p-user-list/
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://www.google.com/pagead/1p-user-list/
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://www.google.com/pagead/1p-user-list/
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://www.google.com/pagead/1p-user-list/
cookieFound: false, false, false, false, false
Google Analytics
Tests whether the browser stops cookies from google-analytics.com from tracking users across websites.
Passed
passed: true, true, true, true
url: https://google-analytics.com/urchin.js
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://google-analytics.com/urchin.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://google-analytics.com/urchin.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://google-analytics.com/urchin.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://google-analytics.com/urchin.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://google-analytics.com/urchin.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://google-analytics.com/urchin.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://google-analytics.com/urchin.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://google-analytics.com/urchin.js
cookieFound: false, false, false, false, false
Google Tag Manager
Tests whether the browser stops cookies from www.googletagmanager.com from tracking users across websites.
Passed
passed: true, true, true, true
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
cookieFound: false, false, false, false, false
Index Exchange
Tests whether the browser stops cookies from dsum-sec.casalemedia.com from tracking users across websites.
Passed
passed: true, true, true, true
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
cookieFound: false, false, false, false, false
New Relic
Tests whether the browser stops cookies from js-agent.newrelic.com from tracking users across websites.
Passed
passed: true, true, true, true
url: https://js-agent.newrelic.com/nr-1212.min.js
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://js-agent.newrelic.com/nr-1212.min.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://js-agent.newrelic.com/nr-1212.min.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://js-agent.newrelic.com/nr-1212.min.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://js-agent.newrelic.com/nr-1212.min.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://js-agent.newrelic.com/nr-1212.min.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://js-agent.newrelic.com/nr-1212.min.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://js-agent.newrelic.com/nr-1212.min.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://js-agent.newrelic.com/nr-1212.min.js
cookieFound: false, false, false, false, false
Quantcast
Tests whether the browser stops cookies from pixel.quantserve.com from tracking users across websites.
Passed
passed: true, true, true, true
url: https://pixel.quantserve.com/pixel
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://pixel.quantserve.com/pixel
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://pixel.quantserve.com/pixel
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://pixel.quantserve.com/pixel
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://pixel.quantserve.com/pixel
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://pixel.quantserve.com/pixel
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://pixel.quantserve.com/pixel
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://pixel.quantserve.com/pixel
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://pixel.quantserve.com/pixel
cookieFound: false, false, false, false, false
Scorecard Research Beacon
Tests whether the browser stops cookies from sb.scorecardresearch.com from tracking users across websites.
Passed
passed: true, true, true, true
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
cookieFound: false, false, false, false, false
Taboola
Tests whether the browser stops cookies from trc.taboola.com from tracking users across websites.
Passed
passed: true, true, true, true
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
cookieFound: false, false, false, false, false
Twitter pixel
Tests whether the browser stops cookies from t.co from tracking users across websites.
Passed
passed: true, true, true, true
url: https://t.co/i/adsct
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://t.co/i/adsct
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://t.co/i/adsct
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://t.co/i/adsct
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://t.co/i/adsct
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://t.co/i/adsct
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://t.co/i/adsct
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://t.co/i/adsct
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://t.co/i/adsct
cookieFound: false, false, false, false, false
Yandex Ads
Tests whether the browser stops cookies from yandex.ru from tracking users across websites.
Passed
passed: true, true, true, true
url: https://yandex.ru/ads/system/header-bidding.js
cookieFound: false, false, false, false
Passed
passed: true, true, true, true, true
url: https://yandex.ru/ads/system/header-bidding.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://yandex.ru/ads/system/header-bidding.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://yandex.ru/ads/system/header-bidding.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true
url: https://yandex.ru/ads/system/header-bidding.js
cookieFound: false, false, false
Passed
passed: true, true, true, true, true
url: https://yandex.ru/ads/system/header-bidding.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://yandex.ru/ads/system/header-bidding.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://yandex.ru/ads/system/header-bidding.js
cookieFound: false, false, false, false, false
Passed
passed: true, true, true, true, true
url: https://yandex.ru/ads/system/header-bidding.js
cookieFound: false, false, false, false, false
Cross-session first-party tracking testsWhich browsers prevent websites from tracking you across browser sessions?
A common vulnerability of web browsers is that they allow websites ("first parties") to 'tag' your browser with some tracking data. This tag can be used to re-identify you when you return to a website you visited before. This category of leaks can be prevented by browser if they clean or isolate data between browser sessions. (In cases where a user has logged into a website or entered detailed information, it may be justifiable for a browser to retain information across sessions. These tests check when no such justification exists: when you have entered no significant information into a website, will the browser still retain data that allows you to be tracked across sessions?)
Alt-Svc
Alt-Svc allows the server to indicate to the web browser that a resource should be loaded on a different server. Because this is a persistent setting, it could be used to track users across websites if it is not correctly partitioned.
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h3, h3, h3, h3
result, different session: h2, h2, h2, h2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Unsupported
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h2, h2, h2, h2, h2
result, different session: h2, h2, h2, h2, h2
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h3, h3, h3
result, different session: h2, h2, h2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Unsupported
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h2, h2, h2, h2, h2
result, different session: h3, h3, h3, h3, h3
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h3, h3, h3
result, different session: h2, h2, h2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h3, h3, h3, h3, h3
result, different session: h2, h2, h2, h2, h2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h3, h3, h3, h3, h3
result, different session: h2, h2, h2, h2, h2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h2, h2, h2, h2, h2
result, different session: h2, h2, h2, h2, h2
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h3, h3, h3, h3, h3
result, different session: h2, h2, h2, h2, h2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
CacheStorage
The Cache API is a content storage mechanism originally introduced to support ServiceWorkers. If the same Cache object is accessible to multiple websites, it can be abused to track users.
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_1p,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_1p,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_1p,
9675e758-e2c4-4130-acb7-67ccb3ae4433_1p
result, different session:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
4c33e845-f58e-469d-9853-1fec8aa5c41d_1p,
01aefaa8-0431-400c-988e-1e1f7ba982a2_1p,
c16dd0cb-2eec-4459-930e-0217f9358f39_1p,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_1p,
dd31aac8-be49-4126-9b1a-f301e645dba3_1p
result, different session:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
0abce94a-eab1-40f6-9274-9a91cd87a8f0_1p,
4cf6bd79-a682-476a-8d83-543566af5966_1p,
9499e247-17ea-47f5-a207-44718b449f78_1p
result, different session:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
a6868889-b914-4496-b110-32f1bc2984ad_1p,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_1p,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_1p,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_1p,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_1p
result, different session:
a6868889-b914-4496-b110-32f1bc2984ad_1p,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_1p,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_1p,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_1p,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96_1p,
fc6c9ea8-266b-4041-ab82-7816d96decb6_1p,
4658621f-e0d9-453c-9f17-1fdc982b3268_1p
result, different session:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
5372076f-3b55-4ff8-b265-cb8a9a54369f_1p,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_1p,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_1p,
ab09d644-f080-47bd-b750-d1da1a205b91_1p,
0c060fef-486b-40b4-86e7-0552c4a69628_1p
result, different session:
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
eb573f77-6e72-4761-bc54-4b1096222778_1p,
15741f5b-efc4-4dd7-b942-c3fbf5b70949_1p,
38ffa9bf-22f2-49d1-b3fc-569208060f22_1p,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0_1p,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38_1p
result, different session:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
41a8db60-b13d-42b6-9555-2ec1278f1356_1p,
b131da08-bc4b-4f09-812e-e871d00e2d15_1p,
cd3789f3-aadd-451e-9453-63af8ca0911d_1p,
2d8d311f-2398-48bf-8c31-78244bd75007_1p,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48_1p
result, different session:
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
95ac96dd-ea93-4960-a931-1a095efa61db_1p,
74777a72-fa7e-4298-943d-1a9bdb94a59e_1p,
893c3bd2-a670-422b-b066-0c9e6af00478_1p,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9_1p,
28252f01-30e4-4331-bba9-8edf371247c2_1p
result, different session:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
cookie (HTTP)
The cookie, first introduced by Netscape in 1994, is a small amount of data stored by your browser on a website's behalf. It has legitimate uses, but it is also the classic cross-site tracking mechanism, and today still the most popular method of tracking users across websites. Browsers can stop cookies from being used for cross-site tracking by either blocking or partitioning them.
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_1p_http,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_1p_http,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_1p_http,
9675e758-e2c4-4130-acb7-67ccb3ae4433_1p_http
result, different session: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
4c33e845-f58e-469d-9853-1fec8aa5c41d_1p_http,
01aefaa8-0431-400c-988e-1e1f7ba982a2_1p_http,
c16dd0cb-2eec-4459-930e-0217f9358f39_1p_http,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_1p_http,
dd31aac8-be49-4126-9b1a-f301e645dba3_1p_http
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
0abce94a-eab1-40f6-9274-9a91cd87a8f0_1p_http,
4cf6bd79-a682-476a-8d83-543566af5966_1p_http,
9499e247-17ea-47f5-a207-44718b449f78_1p_http
result, different session: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
a6868889-b914-4496-b110-32f1bc2984ad_1p_http,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_1p_http,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_1p_http,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_1p_http,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_1p_http
result, different session:
a6868889-b914-4496-b110-32f1bc2984ad_1p_http,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_1p_http,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_1p_http,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_1p_http,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_1p_http
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96_1p_http,
fc6c9ea8-266b-4041-ab82-7816d96decb6_1p_http,
4658621f-e0d9-453c-9f17-1fdc982b3268_1p_http
result, different session: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
5372076f-3b55-4ff8-b265-cb8a9a54369f_1p_http,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_1p_http,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_1p_http,
ab09d644-f080-47bd-b750-d1da1a205b91_1p_http,
0c060fef-486b-40b4-86e7-0552c4a69628_1p_http
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
eb573f77-6e72-4761-bc54-4b1096222778_1p_http,
15741f5b-efc4-4dd7-b942-c3fbf5b70949_1p_http,
38ffa9bf-22f2-49d1-b3fc-569208060f22_1p_http,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0_1p_http,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38_1p_http
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
41a8db60-b13d-42b6-9555-2ec1278f1356_1p_http,
b131da08-bc4b-4f09-812e-e871d00e2d15_1p_http,
cd3789f3-aadd-451e-9453-63af8ca0911d_1p_http,
2d8d311f-2398-48bf-8c31-78244bd75007_1p_http,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48_1p_http
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
95ac96dd-ea93-4960-a931-1a095efa61db_1p_http,
74777a72-fa7e-4298-943d-1a9bdb94a59e_1p_http,
893c3bd2-a670-422b-b066-0c9e6af00478_1p_http,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9_1p_http,
28252f01-30e4-4331-bba9-8edf371247c2_1p_http
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
cookie (JS)
The cookie, first introduced by Netscape in 1994, is a small amount of data stored by your browser on a website's behalf. It has legitimate uses, but it is also the classic cross-site tracking mechanism, and today still the most popular method of tracking users across websites. Browsers can stop cookies from being used for cross-site tracking by either blocking or partitioning them.
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_1p_js,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_1p_js,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_1p_js,
9675e758-e2c4-4130-acb7-67ccb3ae4433_1p_js
result, different session: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
4c33e845-f58e-469d-9853-1fec8aa5c41d_1p_js,
01aefaa8-0431-400c-988e-1e1f7ba982a2_1p_js,
c16dd0cb-2eec-4459-930e-0217f9358f39_1p_js,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_1p_js,
dd31aac8-be49-4126-9b1a-f301e645dba3_1p_js
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
0abce94a-eab1-40f6-9274-9a91cd87a8f0_1p_js,
4cf6bd79-a682-476a-8d83-543566af5966_1p_js,
9499e247-17ea-47f5-a207-44718b449f78_1p_js
result, different session: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
a6868889-b914-4496-b110-32f1bc2984ad_1p_js,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_1p_js,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_1p_js,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_1p_js,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_1p_js
result, different session:
a6868889-b914-4496-b110-32f1bc2984ad_1p_js,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_1p_js,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_1p_js,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_1p_js,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_1p_js
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96_1p_js,
fc6c9ea8-266b-4041-ab82-7816d96decb6_1p_js,
4658621f-e0d9-453c-9f17-1fdc982b3268_1p_js
result, different session: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
5372076f-3b55-4ff8-b265-cb8a9a54369f_1p_js,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_1p_js,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_1p_js,
ab09d644-f080-47bd-b750-d1da1a205b91_1p_js,
0c060fef-486b-40b4-86e7-0552c4a69628_1p_js
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
eb573f77-6e72-4761-bc54-4b1096222778_1p_js,
15741f5b-efc4-4dd7-b942-c3fbf5b70949_1p_js,
38ffa9bf-22f2-49d1-b3fc-569208060f22_1p_js,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0_1p_js,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38_1p_js
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
41a8db60-b13d-42b6-9555-2ec1278f1356_1p_js,
b131da08-bc4b-4f09-812e-e871d00e2d15_1p_js,
cd3789f3-aadd-451e-9453-63af8ca0911d_1p_js,
2d8d311f-2398-48bf-8c31-78244bd75007_1p_js,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48_1p_js
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
95ac96dd-ea93-4960-a931-1a095efa61db_1p_js,
74777a72-fa7e-4298-943d-1a9bdb94a59e_1p_js,
893c3bd2-a670-422b-b066-0c9e6af00478_1p_js,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9_1p_js,
28252f01-30e4-4331-bba9-8edf371247c2_1p_js
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
CookieStore
The Cookie Store API is an alternative asynchronous API for managing cookies, supported by some browsers.
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_1p,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_1p,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_1p,
9675e758-e2c4-4130-acb7-67ccb3ae4433_1p
result, different session: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session:
4c33e845-f58e-469d-9853-1fec8aa5c41d_1p,
01aefaa8-0431-400c-988e-1e1f7ba982a2_1p,
c16dd0cb-2eec-4459-930e-0217f9358f39_1p,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_1p,
dd31aac8-be49-4126-9b1a-f301e645dba3_1p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session:
0abce94a-eab1-40f6-9274-9a91cd87a8f0_1p,
4cf6bd79-a682-476a-8d83-543566af5966_1p,
9499e247-17ea-47f5-a207-44718b449f78_1p
result, different session: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session:
a6868889-b914-4496-b110-32f1bc2984ad_1p,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_1p,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_1p,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_1p,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_1p
result, different session:
a6868889-b914-4496-b110-32f1bc2984ad_1p,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_1p,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_1p,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_1p,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96_1p,
fc6c9ea8-266b-4041-ab82-7816d96decb6_1p,
4658621f-e0d9-453c-9f17-1fdc982b3268_1p
result, different session: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session:
5372076f-3b55-4ff8-b265-cb8a9a54369f_1p,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_1p,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_1p,
ab09d644-f080-47bd-b750-d1da1a205b91_1p,
0c060fef-486b-40b4-86e7-0552c4a69628_1p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session:
eb573f77-6e72-4761-bc54-4b1096222778_1p,
15741f5b-efc4-4dd7-b942-c3fbf5b70949_1p,
38ffa9bf-22f2-49d1-b3fc-569208060f22_1p,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0_1p,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38_1p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session:
41a8db60-b13d-42b6-9555-2ec1278f1356_1p,
b131da08-bc4b-4f09-812e-e871d00e2d15_1p,
cd3789f3-aadd-451e-9453-63af8ca0911d_1p,
2d8d311f-2398-48bf-8c31-78244bd75007_1p,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48_1p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session:
95ac96dd-ea93-4960-a931-1a095efa61db_1p,
74777a72-fa7e-4298-943d-1a9bdb94a59e_1p,
893c3bd2-a670-422b-b066-0c9e6af00478_1p,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9_1p,
28252f01-30e4-4331-bba9-8edf371247c2_1p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
CSS cache
CSS stylesheets are cached, and if that cache is shared between websites, it can be used to track users across sites.
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_31005222569894686,
fake_31525746231412155,
fake_9142010269417662,
fake_507019436286273
result, different session:
fake_03358053499490121,
fake_5270278572201905,
fake_5191196214233815,
fake_28627219649317937
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_21215118548186696,
fake_647011983404177,
fake_3831305702451122,
fake_7483432417919942,
fake_5762784679459827
result, different session:
fake_3395932111419069,
fake_40710205868491456,
fake_7262544876434185,
fake_16563629523787293,
fake_4666355924519552
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_953273395959594,
fake_35907110444810497,
fake_5654027777186375
result, different session:
fake_3372767933721783,
fake_9048165978896414,
fake_2336796284113125
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_06716700044706814,
fake_4112493830837234,
fake_5144147018385354,
fake_25807973929634476,
fake_8486538600124396
result, different session:
fake_06716700044706814,
fake_4112493830837234,
fake_5144147018385354,
fake_25807973929634476,
fake_8486538600124396
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_9185185104070135,
fake_04483509554707976,
fake_5585436655012099
result, different session:
fake_9529526340054457,
fake_01704176521711931,
fake_3903045116504553
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_8546460135198093,
fake_06168965747651267,
fake_465497587621593,
fake_702810095703285,
fake_8238885625387615
result, different session:
fake_0006405704204990315,
fake_33691225915336864,
fake_9407454681987215,
fake_7871625400460789,
fake_7195392945658703
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_8581159727725798,
fake_25665659758276127,
fake_24787081187781212,
fake_392210595701183,
fake_7453488771310479
result, different session:
fake_5426570245332922,
fake_46175700218181914,
fake_17576566417715034,
fake_2673302328982581,
fake_8968262041871606
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_8261645896224921,
fake_456701028656717,
fake_11031773648346954,
fake_9582205278217455,
fake_8184939915062066
result, different session:
fake_27199209744193076,
fake_7356432721394968,
fake_9545751277208394,
fake_38644296415968027,
fake_5200130741681299
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_1564740201478021,
fake_47076207211156307,
fake_6756977075827433,
fake_11418857519731196,
fake_8070099463398563
result, different session:
fake_427370368198146,
fake_23293440707551105,
fake_2720959696341123,
fake_7845012642238929,
fake_6438056928600746
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
favicon cache
A favicon is an icon that represents a website, typically shown in browser tab and bookmarks menu. If the favicon cache is not partitioned, it can be used to track users across websites.
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 2, 2, 2, 2, 2
result, different session: 4, 4, 4, 4, 4
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
fetch cache
When a resource is received via the Fetch API, it is frequently cached. That cache can potentially be abused for cross-site tracking.
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
font cache
Web fonts are sometimes stored in their own cache, which is vulnerable to being abused for cross-site tracking.
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
iframe cache
An iframe is an element in a web page than allows websites to embed a second web page. Caching of this web page could be abused for cross-site tracking.
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
image cache
Caching of images in web browsers is a standard behavior. But if that cache leaks between websites, it can be abused for cross-site tracking.
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
indexedDB
The IndexedDB API exposes a transactional database to web pages. That database can be used to track users across websites, unless it is partitioned.
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_1p,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_1p,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_1p,
9675e758-e2c4-4130-acb7-67ccb3ae4433_1p
result, different session: undefined
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
4c33e845-f58e-469d-9853-1fec8aa5c41d_1p,
01aefaa8-0431-400c-988e-1e1f7ba982a2_1p,
c16dd0cb-2eec-4459-930e-0217f9358f39_1p,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_1p,
dd31aac8-be49-4126-9b1a-f301e645dba3_1p
result, different session: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
0abce94a-eab1-40f6-9274-9a91cd87a8f0_1p,
4cf6bd79-a682-476a-8d83-543566af5966_1p,
9499e247-17ea-47f5-a207-44718b449f78_1p
result, different session: undefined
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
a6868889-b914-4496-b110-32f1bc2984ad_1p,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_1p,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_1p,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_1p,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_1p
result, different session:
a6868889-b914-4496-b110-32f1bc2984ad_1p,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_1p,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_1p,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_1p,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96_1p,
fc6c9ea8-266b-4041-ab82-7816d96decb6_1p,
4658621f-e0d9-453c-9f17-1fdc982b3268_1p
result, different session: undefined
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
5372076f-3b55-4ff8-b265-cb8a9a54369f_1p,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_1p,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_1p,
ab09d644-f080-47bd-b750-d1da1a205b91_1p,
0c060fef-486b-40b4-86e7-0552c4a69628_1p
result, different session: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
eb573f77-6e72-4761-bc54-4b1096222778_1p,
15741f5b-efc4-4dd7-b942-c3fbf5b70949_1p,
38ffa9bf-22f2-49d1-b3fc-569208060f22_1p,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0_1p,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38_1p
result, different session: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
41a8db60-b13d-42b6-9555-2ec1278f1356_1p,
b131da08-bc4b-4f09-812e-e871d00e2d15_1p,
cd3789f3-aadd-451e-9453-63af8ca0911d_1p,
2d8d311f-2398-48bf-8c31-78244bd75007_1p,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48_1p
result, different session: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
95ac96dd-ea93-4960-a931-1a095efa61db_1p,
74777a72-fa7e-4298-943d-1a9bdb94a59e_1p,
893c3bd2-a670-422b-b066-0c9e6af00478_1p,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9_1p,
28252f01-30e4-4331-bba9-8edf371247c2_1p
result, different session: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
localStorage
The localStorage API gives websites access to a key-value database that will remain available across visits. If the localStorage API is not partitioned or blocked, it can also be used to track users across websites.
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_1p,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_1p,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_1p,
9675e758-e2c4-4130-acb7-67ccb3ae4433_1p
result, different session: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
4c33e845-f58e-469d-9853-1fec8aa5c41d_1p,
01aefaa8-0431-400c-988e-1e1f7ba982a2_1p,
c16dd0cb-2eec-4459-930e-0217f9358f39_1p,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_1p,
dd31aac8-be49-4126-9b1a-f301e645dba3_1p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
0abce94a-eab1-40f6-9274-9a91cd87a8f0_1p,
4cf6bd79-a682-476a-8d83-543566af5966_1p,
9499e247-17ea-47f5-a207-44718b449f78_1p
result, different session: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
a6868889-b914-4496-b110-32f1bc2984ad_1p,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_1p,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_1p,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_1p,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_1p
result, different session:
a6868889-b914-4496-b110-32f1bc2984ad_1p,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_1p,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_1p,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_1p,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96_1p,
fc6c9ea8-266b-4041-ab82-7816d96decb6_1p,
4658621f-e0d9-453c-9f17-1fdc982b3268_1p
result, different session: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
5372076f-3b55-4ff8-b265-cb8a9a54369f_1p,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_1p,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_1p,
ab09d644-f080-47bd-b750-d1da1a205b91_1p,
0c060fef-486b-40b4-86e7-0552c4a69628_1p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
eb573f77-6e72-4761-bc54-4b1096222778_1p,
15741f5b-efc4-4dd7-b942-c3fbf5b70949_1p,
38ffa9bf-22f2-49d1-b3fc-569208060f22_1p,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0_1p,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38_1p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
41a8db60-b13d-42b6-9555-2ec1278f1356_1p,
b131da08-bc4b-4f09-812e-e871d00e2d15_1p,
cd3789f3-aadd-451e-9453-63af8ca0911d_1p,
2d8d311f-2398-48bf-8c31-78244bd75007_1p,
3f957e99-9b22-4fe6-9c92-d10aa92b1f48_1p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
95ac96dd-ea93-4960-a931-1a095efa61db_1p,
74777a72-fa7e-4298-943d-1a9bdb94a59e_1p,
893c3bd2-a670-422b-b066-0c9e6af00478_1p,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9_1p,
28252f01-30e4-4331-bba9-8edf371247c2_1p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
prefetch cache
A <link rel='prefetch'...> suggests to browsers they should fetch a resource ahead of time and cache it. But if browsers don't partition this cache, it can be used to track users across websites.
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Unsupported
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session:
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received
result, different session:
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session:
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received
result, different session:
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
script cache
Caching of scripts in web browsers is a standard behavior. But if that cache leaks between websites, it can be abused for cross-site tracking.
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
XMLHttpRequest cache
Similar to the newer Fetch API, any resource received may be cached by the browser. The cache is potentially vulnerable to cross-site tracking attack.
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Cross-session third-party tracking testsWhich browsers prevent third-party trackers from tracking you across browser sessions?
A common vulnerability of web browsers is that they allow third-party trackers to 'tag' your browser with some tracking data. This tag can be used to re-identify you when you return to a website you visited before. This category of leaks can be prevented by browser if they clean or isolate data between browser sessions. (In cases where a user has logged into a website or entered detailed information, it may be justifiable for a browser to retain information across sessions. These tests check when no such justification exists: when you have entered no significant information into a website, will the browser still retain data that allows you to be tracked across sessions?)
Alt-Svc
Alt-Svc allows the server to indicate to the web browser that a resource should be loaded on a different server. Because this is a persistent setting, it could be used to track users across websites if it is not correctly partitioned.
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h3, h3, h3, h3
result, different session: h2, h2, h2, h2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Unsupported
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h2, h2, h2, h2, h2
result, different session: h2, h2, h2, h2, h2
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h3, h3, h3
result, different session: h2, h2, h2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Unsupported
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h2, h2, h2, h2, h2
result, different session: h2, h2, h2, h2, h2
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h3, h3, h3
result, different session: h2, h2, h2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h3, h3, h3, h3, h3
result, different session: h2, h2, h2, h2, h2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h3, h3, h3, h3, h3
result, different session: h2, h2, h2, h2, h2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h2, h2, h2, h2, h2
result, different session: h2, h2, h2, h2, h2
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
        let responseText = '';
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/clear');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after clear:', responseText);
        // Store "h3" state in Alt-Svc cache
        for (let i = 0; i < 3; ++i) {
          await fetch(altSvcOrigin + '/set');
          await sleepMs(100);
        }
        responseText = await fetchText(altSvcOrigin + '/protocol');
        console.log('after set:', responseText);
      }
read: async () => {
        const protocol = await fetchText(altSvcOrigin + '/protocol');
        if ((new URL(window.location)).searchParams.get('thirdparty') === 'same') {
          if (protocol !== 'h3') {
            throw new Error('Unsupported');
          }
        }
        return protocol;
      }
result, same session: h3, h3, h3, h3, h3
result, different session: h2, h2, h2, h2, h2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
CacheStorage
The Cache API is a content storage mechanism originally introduced to support ServiceWorkers. If the same Cache object is accessible to multiple websites, it can be abused to track users.
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_3p,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_3p,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_3p,
9675e758-e2c4-4130-acb7-67ccb3ae4433_3p
result, different session:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
4c33e845-f58e-469d-9853-1fec8aa5c41d_3p,
01aefaa8-0431-400c-988e-1e1f7ba982a2_3p,
c16dd0cb-2eec-4459-930e-0217f9358f39_3p,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_3p,
dd31aac8-be49-4126-9b1a-f301e645dba3_3p
result, different session:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
0abce94a-eab1-40f6-9274-9a91cd87a8f0_3p,
4cf6bd79-a682-476a-8d83-543566af5966_3p,
9499e247-17ea-47f5-a207-44718b449f78_3p
result, different session:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
a6868889-b914-4496-b110-32f1bc2984ad_3p,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_3p,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_3p,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_3p,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_3p
result, different session:
a6868889-b914-4496-b110-32f1bc2984ad_3p,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_3p,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_3p,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_3p,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_3p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96_3p,
fc6c9ea8-266b-4041-ab82-7816d96decb6_3p,
4658621f-e0d9-453c-9f17-1fdc982b3268_3p
result, different session:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
5372076f-3b55-4ff8-b265-cb8a9a54369f_3p,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_3p,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_3p,
ab09d644-f080-47bd-b750-d1da1a205b91_3p,
0c060fef-486b-40b4-86e7-0552c4a69628_3p
result, different session:
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined,
Error: can't access property "url",
cacheKeys[0] is undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
eb573f77-6e72-4761-bc54-4b1096222778_3p,
15741f5b-efc4-4dd7-b942-c3fbf5b70949_3p,
38ffa9bf-22f2-49d1-b3fc-569208060f22_3p,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0_3p,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38_3p
result, different session:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.
result, different session:
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
95ac96dd-ea93-4960-a931-1a095efa61db_3p,
74777a72-fa7e-4298-943d-1a9bdb94a59e_3p,
893c3bd2-a670-422b-b066-0c9e6af00478_3p,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9_3p,
28252f01-30e4-4331-bba9-8edf371247c2_3p
result, different session:
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
cookie (HTTP)
The cookie, first introduced by Netscape in 1994, is a small amount of data stored by your browser on a website's behalf. It has legitimate uses, but it is also the classic cross-site tracking mechanism, and today still the most popular method of tracking users across websites. Browsers can stop cookies from being used for cross-site tracking by either blocking or partitioning them.
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_3p_http,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_3p_http,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_3p_http,
9675e758-e2c4-4130-acb7-67ccb3ae4433_3p_http
result, different session: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
4c33e845-f58e-469d-9853-1fec8aa5c41d_3p_http,
01aefaa8-0431-400c-988e-1e1f7ba982a2_3p_http,
c16dd0cb-2eec-4459-930e-0217f9358f39_3p_http,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_3p_http,
dd31aac8-be49-4126-9b1a-f301e645dba3_3p_http
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session: , ,
result, different session: , ,
unsupported: true, true, true
passed: undefined
test failed: false, false, false
Unsupported
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session: , ,
result, different session: , ,
unsupported: true, true, true
passed: undefined
test failed: false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
5372076f-3b55-4ff8-b265-cb8a9a54369f_3p_http,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_3p_http,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_3p_http,
ab09d644-f080-47bd-b750-d1da1a205b91_3p_http,
0c060fef-486b-40b4-86e7-0552c4a69628_3p_http
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${baseURI}cookie?secret=${secret}_http`);
      }
read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
        const response = await fetch(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
cookie (JS)
The cookie, first introduced by Netscape in 1994, is a small amount of data stored by your browser on a website's behalf. It has legitimate uses, but it is also the classic cross-site tracking mechanism, and today still the most popular method of tracking users across websites. Browsers can stop cookies from being used for cross-site tracking by either blocking or partitioning them.
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_3p_js,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_3p_js,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_3p_js,
9675e758-e2c4-4130-acb7-67ccb3ae4433_3p_js
result, different session: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
4c33e845-f58e-469d-9853-1fec8aa5c41d_3p_js,
01aefaa8-0431-400c-988e-1e1f7ba982a2_3p_js,
c16dd0cb-2eec-4459-930e-0217f9358f39_3p_js,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_3p_js,
dd31aac8-be49-4126-9b1a-f301e645dba3_3p_js
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session: , ,
result, different session: , ,
unsupported: true, true, true
passed: undefined
test failed: false, false, false
Unsupported
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session: , ,
result, different session: , ,
unsupported: true, true, true
passed: undefined
test failed: false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
5372076f-3b55-4ff8-b265-cb8a9a54369f_3p_js,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_3p_js,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_3p_js,
ab09d644-f080-47bd-b750-d1da1a205b91_3p_js,
0c060fef-486b-40b4-86e7-0552c4a69628_3p_js
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
CookieStore
The Cookie Store API is an alternative asynchronous API for managing cookies, supported by some browsers.
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_3p,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_3p,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_3p,
9675e758-e2c4-4130-acb7-67ccb3ae4433_3p
result, different session: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session:
4c33e845-f58e-469d-9853-1fec8aa5c41d_3p,
01aefaa8-0431-400c-988e-1e1f7ba982a2_3p,
c16dd0cb-2eec-4459-930e-0217f9358f39_3p,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_3p,
dd31aac8-be49-4126-9b1a-f301e645dba3_3p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session: , ,
result, different session: , ,
unsupported: true, true, true
passed: undefined
test failed: false, false, false
Unsupported
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session: , ,
result, different session: , ,
unsupported: true, true, true
passed: undefined
test failed: false, false, false
Passed
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session:
5372076f-3b55-4ff8-b265-cb8a9a54369f_3p,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_3p,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_3p,
ab09d644-f080-47bd-b750-d1da1a205b91_3p,
0c060fef-486b-40b4-86e7-0552c4a69628_3p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
write: (data) => {
        const msPerHour = 60 * 60 * 1000;
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        window.cookieStore.set({
          name: 'partition_test',
          value: data,
          expires: Date.now() + msPerHour,
          sameSite: 'none'
        });
      }
read: async () => {
        if (!window.cookieStore) {
          throw new Error('Unsupported');
        }
        const cookie = await window.cookieStore.get('partition_test');
        if (!cookie) {
          return null;
        }
        return cookie.value;
      }
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
CSS cache
CSS stylesheets are cached, and if that cache is shared between websites, it can be used to track users across sites.
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_5683313034186919,
fake_19976468012018,
fake_46582527017848663,
fake_9919405919144773
result, different session:
fake_7111468800220275,
fake_7259114033263279,
fake_4245685449114234,
fake_9545518795465153
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_9527480871630647,
fake_06752866506187316,
fake_3029561631102329,
fake_6752283499048242,
fake_8170577150877629
result, different session:
fake_954708127398155,
fake_3574670475967614,
fake_2145013271936429,
fake_40035634730411607,
fake_020447573974785138
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_7746304099023473,
fake_6391596180600614,
fake_5189145854335329
result, different session:
fake_46630016676298247,
fake_9821538311197908,
fake_40451651248398246
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_7488846812885681,
fake_1905027922323792,
fake_8552080894059704,
fake_9168797239382032,
fake_1321191495929348
result, different session:
fake_7488846812885681,
fake_1905027922323792,
fake_8552080894059704,
fake_9168797239382032,
fake_1321191495929348
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_2890155402398853,
fake_3871540304217076,
fake_5692626237169436
result, different session:
fake_054819187527949564,
fake_9377482517919231,
fake_38117521946556976
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_7884438191429048,
fake_4709019709394435,
fake_9779445917697185,
fake_9179793149677544,
fake_32356803134353473
result, different session:
fake_6064374881798478,
fake_5259240800026168,
fake_9430038615913676,
fake_15207044883361553,
fake_4998439549426854
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_5158279568059987,
fake_9474443147850953,
fake_4942327043724699,
fake_5503019013962269,
fake_9129112934058752
result, different session:
fake_3747402431015836,
fake_16910811197783304,
fake_3211972805650172,
fake_7845178398725612,
fake_13989215563277613
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_17010227011340828,
fake_5109157768529564,
fake_7031850383225864,
fake_035327301797869914,
fake_3052603304904422
result, different session:
fake_25106133361089333,
fake_9532703736831867,
fake_7696958856308769,
fake_4766628404483475,
fake_5041939163344091
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return key;
      }
read: async (key) => {
        const href = testURI('resource', 'css', key);
        const head = document.getElementsByTagName('head')[0];
        head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
        const testElement = document.querySelector('#css');
        let fontFamily;
        while (true) {
          await sleepMs(100);
          fontFamily = window.getComputedStyle(testElement).fontFamily;
          if (fontFamily.startsWith('fake')) {
            break;
          }
        }
        console.log(fontFamily);
        return fontFamily;
      }
result, same session:
fake_6326166085445324,
fake_09234914930391658,
fake_09407485830015538,
fake_48226112608407967,
fake_6931149558291123
result, different session:
fake_6800189280159776,
fake_0634867494527096,
fake_5162867534759841,
fake_5036795384336807,
fake_9985405804321466
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
favicon cache
A favicon is an icon that represents a website, typically shown in browser tab and bookmarks menu. If the favicon cache is not partitioned, it can be used to track users across websites.
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => key
read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
        await sleepMs(2000);
        const response = await fetch(
          testURI('ctr', 'favicon', key), { cache: 'reload' });
        const count = (await response.text()).trim();
        if (count === '0') {
          throw new Error('No requests received');
        }
        return count;
      }
result, same session: 2, 2, 2, 2, 2
result, different session: 4, 4, 4, 4, 4
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
fetch cache
When a resource is received via the Fetch API, it is frequently cached. That cache can potentially be abused for cross-site tracking.
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        return key;
      }
read: async (key) => {
        await fetch(testURI('resource', 'fetch', key),
          { cache: 'force-cache' });
        const countResponse = await fetch(testURI('ctr', 'fetch', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
font cache
Web fonts are sometimes stored in their own cache, which is vulnerable to being abused for cross-site tracking.
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        return key;
      }
read: async (key) => {
        const text = document.createElement('span');
        text.id = 'text';
        text.innerText = 'test';
        document.body.appendChild(text);
        const originalWidth = text.getBoundingClientRect().width;
        const style = document.createElement('style');
        style.type = 'text/css';
        const fontURI = testURI('resource', 'font', key);
        style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } #text { font-family: "myFont" }`;
        document.getElementsByTagName('head')[0].appendChild(style);
        let newWidth;
        do {
          await sleepMs(100);
          newWidth = text.getBoundingClientRect().width;
        } while (newWidth < 0 || newWidth === originalWidth);
        const response = await fetch(
          testURI('ctr', 'font', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
iframe cache
An iframe is an element in a web page than allows websites to embed a second web page. Caching of this web page could be abused for cross-site tracking.
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.addEventListener('load', () => resolve(key), { once: true });
        iframe.src = testURI('resource', 'page', key);
      })
read: async (key) => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        const iframeLoadPromise = new Promise((resolve, reject) => {
          iframe.addEventListener('load', resolve, { once: true });
        });
        const address = testURI('resource', 'page', key);
        iframe.src = address;
        await iframeLoadPromise;
        const response = await fetch(
          testURI('ctr', 'page', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
image cache
Caching of images in web browsers is a standard behavior. But if that cache leaks between websites, it can be abused for cross-site tracking.
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        img.addEventListener('load', () => resolve(key), { once: true });
        img.src = testURI('resource', 'image', key);
      })
read: async (key) => {
        const img = document.createElement('img');
        document.body.appendChild(img);
        const imgLoadPromise = new Promise((resolve, reject) => {
          img.addEventListener('load', resolve, { once: true });
        });
        img.src = testURI('resource', 'image', key);
        await imgLoadPromise;
        const response = await fetch(
          testURI('ctr', 'image', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
indexedDB
The IndexedDB API exposes a transactional database to web pages. That database can be used to track users across websites, unless it is partitioned.
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_3p,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_3p,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_3p,
9675e758-e2c4-4130-acb7-67ccb3ae4433_3p
result, different session: undefined
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
4c33e845-f58e-469d-9853-1fec8aa5c41d_3p,
01aefaa8-0431-400c-988e-1e1f7ba982a2_3p,
c16dd0cb-2eec-4459-930e-0217f9358f39_3p,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_3p,
dd31aac8-be49-4126-9b1a-f301e645dba3_3p
result, different session: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
0abce94a-eab1-40f6-9274-9a91cd87a8f0_3p,
4cf6bd79-a682-476a-8d83-543566af5966_3p,
9499e247-17ea-47f5-a207-44718b449f78_3p
result, different session: undefined
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
a6868889-b914-4496-b110-32f1bc2984ad_3p,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_3p,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_3p,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_3p,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_3p
result, different session: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96_3p,
fc6c9ea8-266b-4041-ab82-7816d96decb6_3p,
4658621f-e0d9-453c-9f17-1fdc982b3268_3p
result, different session: undefined
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
5372076f-3b55-4ff8-b265-cb8a9a54369f_3p,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_3p,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_3p,
ab09d644-f080-47bd-b750-d1da1a205b91_3p,
0c060fef-486b-40b4-86e7-0552c4a69628_3p
result, different session: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
eb573f77-6e72-4761-bc54-4b1096222778_3p,
15741f5b-efc4-4dd7-b942-c3fbf5b70949_3p,
38ffa9bf-22f2-49d1-b3fc-569208060f22_3p,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0_3p,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38_3p
result, different session: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
Error: IDBFactory.open: The operation is insecure,
Error: IDBFactory.open: The operation is insecure,
Error: IDBFactory.open: The operation is insecure,
Error: IDBFactory.open: The operation is insecure,
Error: IDBFactory.open: The operation is insecure
result, different session:
Error: IDBFactory.open: The operation is insecure,
Error: IDBFactory.open: The operation is insecure,
Error: IDBFactory.open: The operation is insecure,
Error: IDBFactory.open: The operation is insecure,
Error: IDBFactory.open: The operation is insecure
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
95ac96dd-ea93-4960-a931-1a095efa61db_3p,
74777a72-fa7e-4298-943d-1a9bdb94a59e_3p,
893c3bd2-a670-422b-b066-0c9e6af00478_3p,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9_3p,
28252f01-30e4-4331-bba9-8edf371247c2_3p
result, different session: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
localStorage
The localStorage API gives websites access to a key-value database that will remain available across visits. If the localStorage API is not partitioned or blocked, it can also be used to track users across websites.
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
9149ed0c-20d2-4ba8-8ae6-744720f18b1a_3p,
d19de502-0304-4b31-a9bb-1b9e72c0f51e_3p,
f8e2f297-52d1-4075-bf1f-e66acc780fbd_3p,
9675e758-e2c4-4130-acb7-67ccb3ae4433_3p
result, different session: , , ,
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
4c33e845-f58e-469d-9853-1fec8aa5c41d_3p,
01aefaa8-0431-400c-988e-1e1f7ba982a2_3p,
c16dd0cb-2eec-4459-930e-0217f9358f39_3p,
61c8523f-f2ab-4d29-bfea-51e78f4b0d1d_3p,
dd31aac8-be49-4126-9b1a-f301e645dba3_3p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
0abce94a-eab1-40f6-9274-9a91cd87a8f0_3p,
4cf6bd79-a682-476a-8d83-543566af5966_3p,
9499e247-17ea-47f5-a207-44718b449f78_3p
result, different session: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
a6868889-b914-4496-b110-32f1bc2984ad_3p,
2d665fbd-6aed-4dcb-9795-6b402ad715cf_3p,
97cdd9bf-f365-46b9-a68c-6f50a80312c2_3p,
bbce3f2b-974f-456f-9f07-a5ea3344a5dd_3p,
91e2455c-2121-4f68-abcd-6b4bbe9c3df9_3p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
ac2c0ca4-296f-45ae-969a-f9f6bb73ca96_3p,
fc6c9ea8-266b-4041-ab82-7816d96decb6_3p,
4658621f-e0d9-453c-9f17-1fdc982b3268_3p
result, different session: , ,
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
5372076f-3b55-4ff8-b265-cb8a9a54369f_3p,
7c511f33-ee8a-4882-8d4c-c9a01f8db872_3p,
281673a1-d9fa-4c7e-8cfe-5ea2468547f6_3p,
ab09d644-f080-47bd-b750-d1da1a205b91_3p,
0c060fef-486b-40b4-86e7-0552c4a69628_3p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
eb573f77-6e72-4761-bc54-4b1096222778_3p,
15741f5b-efc4-4dd7-b942-c3fbf5b70949_3p,
38ffa9bf-22f2-49d1-b3fc-569208060f22_3p,
56ec3dd5-7303-4ad0-a525-5f2a03667ae0_3p,
e8f22c8a-94aa-49e1-bc4c-09bcc268fc38_3p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.
result, different session:
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
95ac96dd-ea93-4960-a931-1a095efa61db_3p,
74777a72-fa7e-4298-943d-1a9bdb94a59e_3p,
893c3bd2-a670-422b-b066-0c9e6af00478_3p,
8b9993f5-e52f-42d6-9ae6-287ea1c8bff9_3p,
28252f01-30e4-4331-bba9-8edf371247c2_3p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
prefetch cache
A <link rel='prefetch'...> suggests to browsers they should fetch a resource ahead of time and cache it. But if browsers don't partition this cache, it can be used to track users across websites.
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Unsupported
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session:
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received
result, different session:
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Unsupported
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session:
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received
result, different session:
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        return key;
      }
read: async (key) => {
        const link = document.createElement('link');
        link.rel = 'prefetch';
        link.href = testURI('resource', 'prefetch', key);
        document.getElementsByTagName('head')[0].appendChild(link);
        await sleepMs(500);
        const response = await fetch(
          testURI('ctr', 'prefetch', key), { cache: 'reload' });
        const countString = (await response.text()).trim();
        if (parseInt(countString) === 0) {
          throw new Error('No requests received');
        }
        return countString;
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
script cache
Caching of scripts in web browsers is a standard behavior. But if that cache leaks between websites, it can be abused for cross-site tracking.
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        script.addEventListener('load', () => resolve(key), { once: true });
        script.src = testURI('resource', 'script', key);
      })
read: async (key) => {
        const script = document.createElement('script');
        document.body.appendChild(script);
        const scriptLoadPromise = new Promise((resolve, reject) => {
          script.addEventListener('load', resolve, { once: true });
        });
        script.src = testURI('resource', 'script', key);
        await scriptLoadPromise;
        const response = await fetch(
          testURI('ctr', 'script', key), { cache: 'reload' });
        return (await response.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
XMLHttpRequest cache
Similar to the newer Fetch API, any resource received may be cached by the browser. The cache is potentially vulnerable to cross-site tracking attack.
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1
result, different session: 2, 2, 2, 2
unsupported: false, false, false, false
passed: true, true, true, true
test failed: false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Failed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 1, 1, 1, 1, 1
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1
result, different session: 2, 2, 2
unsupported: false, false, false
passed: true, true, true
test failed: false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        return key;
      }
read: async (key) => {
        const req = new window.XMLHttpRequest();
        const loadPromise = new Promise(resolve => req.addEventListener('load', resolve));
        req.open('GET', testURI('resource', 'xhr', key));
        req.send();
        await loadPromise;
        const countResponse = await fetch(testURI('ctr', 'xhr', key),
          { cache: 'reload' });
        return (await countResponse.text()).trim();
      }
result, same session: 1, 1, 1, 1, 1
result, different session: 2, 2, 2, 2, 2
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
DNS privacy testsWhich browsers keep their DNS queries encrypted?
The Domain Name System (DNS) is the method by which web browsers look up the IP address for each website you visit. In a DNS query, a web browser will ask a DNS resolver (somewhere on the internet) for the IP address corresponding to a domain name (such as nytimes.com) for a website you want to visit. Traditionally, most web browsers have sent their DNS queries unencrypted, which means your ISP or anyone else on the network between your computer and the DNS resolver can eavesdrop on the websites you visit. In recent years, web browsers and operating systems have begun to introduce encrypted DNS, including the DNS over HTTPS (DoH) protocol, to encrypt the DNS request from your browser and the response from the resolver to keep your browsing history from leaking. These tests check whether a browser is still protecting its DNS requests by sending them encrypted.
Location: Brazil
  Checks whether the browser decides to use
  encrypted DNS if the computer is located in Brazil.
Failed
passed: false, false, false, false
leak detected: true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Location: China
  Checks whether the browser decides to use
  encrypted DNS if the computer is located in China.
Failed
passed: false, false, false, false
leak detected: true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Location: Germany
  Checks whether the browser decides to use
  encrypted DNS if the computer is located in Germany.
Failed
passed: false, false, false, false
leak detected: true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Location: India
  Checks whether the browser decides to use
  encrypted DNS if the computer is located in India.
Failed
passed: false, false, false, false
leak detected: true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Location: Nigeria
  Checks whether the browser decides to use
  encrypted DNS if the computer is located in Nigeria.
Failed
passed: false, false, false, false
leak detected: true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Location: Russia
  Checks whether the browser decides to use
  encrypted DNS if the computer is located in Russia.
Failed
passed: false, false, false, false
leak detected: true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Location: United States
  Checks whether the browser decides to use
  encrypted DNS if the computer is located in United States.
Failed
passed: false, false, false, false
leak detected: true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
OS DNS: Cloudflare
  Checks whether the browser decides to use
  encrypted DNS if the operating system's default DNS provider is Cloudflare.
Passed
passed: true, true, true, true
leak detected: false, false, false, false
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Passed
passed: true, true, true
leak detected: false, false, false
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Passed
passed: true, true, true
leak detected: false, false, false
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
OS DNS: Comodo
  Checks whether the browser decides to use
  encrypted DNS if the operating system's default DNS provider is Comodo.
Failed
passed: false, false, false, false
leak detected: true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false
leak detected: true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
OS DNS: Google
  Checks whether the browser decides to use
  encrypted DNS if the operating system's default DNS provider is Google.
Passed
passed: true, true, true, true
leak detected: false, false, false, false
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Passed
passed: true, true, true
leak detected: false, false, false
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Passed
passed: true, true, true
leak detected: false, false, false
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
OS DNS: Quad9
  Checks whether the browser decides to use
  encrypted DNS if the operating system's default DNS provider is Quad9.
Passed
passed: true, true, true, true
leak detected: false, false, false, false
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false
leak detected: true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false
leak detected: true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true
Passed
passed: true, true, true, true, true
leak detected: false, false, false, false, false
Failed
passed: false, false, false, false, false
leak detected: true, true, true, true, true