iOS Browsers

(default settings)
brave logo
brave
1.94
chrome logo
chrome
153.8010
duckduckgo logo
duckduckgo
7.236
edge logo
edge
152.4191
firefox logo
firefox
155.1
focus logo
focus
155.0
safari logo
safari
26.6
vivaldi logo
vivaldi
8.4147
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, Error: Unsupported, h3, Error: Unsupported, h3
result, different first party: h2, h2, h2, h2, h2
unsupported: false, true, false, true, false
passed: 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, Error: Unsupported, h3, Error: Unsupported, Error: Unsupported
result, different first party: h2, h2, h2, h2, h2
unsupported: false, true, false, true, true
passed: 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, Error: Unsupported, h3, Error: Unsupported, h3
result, different first party: h2, h2, h2, h2, h2
unsupported: false, true, false, true, false
passed: 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, Error: Unsupported, h3, Error: Unsupported, h3
result, different first party: h2, h2, h2, h2, h2
unsupported: false, true, false, true, false
passed: 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, Error: Unsupported, h3, Error: Unsupported, h3
result, different first party: h2, h2, h2, h2, h2
unsupported: false, true, false, true, false
passed: 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, Error: Unsupported, h3, Error: Unsupported, h3
result, different first party: h2, h2, h2, h2, h2
unsupported: false, true, false, true, false
passed: 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, Error: Unsupported, h3, Error: Unsupported, h3
result, different first party: h2, h2, h2, h2, h2
unsupported: false, true, false, true, false
passed: 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=${secret}`);
        const result = await response.json();
        const blobUrl = decodeURIComponent(result.blobUrl);
        const blobResponse = await fetch(blobUrl);
        return blobResponse.text();
      }
result, same first party:
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed
result, different first party:
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed
unsupported: false, false, false, false, false
passed: undefined
test failed: true, true, true, true, true
Passed
write: (secret) => {
        try {
          const blobURL = URL.createObjectURL(new Blob([secret]));
          fetch(`${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:
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed
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: undefined
test failed: true, true, true, true, true
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=${secret}`);
        const result = await response.json();
        const blobUrl = decodeURIComponent(result.blobUrl);
        const blobResponse = await fetch(blobUrl);
        return blobResponse.text();
      }
result, same first party:
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed
result, different first party:
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed
unsupported: false, false, false, false, false
passed: undefined
test failed: true, true, true, true, true
Passed
write: (secret) => {
        try {
          const blobURL = URL.createObjectURL(new Blob([secret]));
          fetch(`${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:
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed
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: undefined
test failed: true, true, true, true, true
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=${secret}`);
        const result = await response.json();
        const blobUrl = decodeURIComponent(result.blobUrl);
        const blobResponse = await fetch(blobUrl);
        return blobResponse.text();
      }
result, same first party:
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed
result, different first party:
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed
unsupported: false, false, false, false, false
passed: undefined
test failed: true, true, true, true, true
Passed
write: (secret) => {
        try {
          const blobURL = URL.createObjectURL(new Blob([secret]));
          fetch(`${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:
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed
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: undefined
test failed: true, true, true, true, true
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=${secret}`);
        const result = await response.json();
        const blobUrl = decodeURIComponent(result.blobUrl);
        const blobResponse = await fetch(blobUrl);
        return blobResponse.text();
      }
result, same first party:
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed
result, different first party:
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed
unsupported: false, false, false, false, false
passed: undefined
test failed: true, true, true, true, true
Passed
write: (secret) => {
        try {
          const blobURL = URL.createObjectURL(new Blob([secret]));
          fetch(`${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:
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed,
Error: Load failed
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: undefined
test failed: true, true, true, true, true
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:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
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: undefined
test failed: true, true, true, true, true
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:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
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: undefined
test failed: true, true, true, true, true
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:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
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: undefined
test failed: true, true, true, true, true
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:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
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: undefined
test failed: true, true, true, true, true
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:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
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: undefined
test failed: true, true, true, true, true
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:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
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: undefined
test failed: true, true, true, true, true
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:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
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: undefined
test failed: true, true, true, true, true
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:
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message
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: undefined
test failed: true, true, true, true, true
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=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same first party:
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56
result, different first party:
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${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:
3896d4ce-c55d-4bf1-ae02-9cee2145850c,
3896d4ce-c55d-4bf1-ae02-9cee2145850c,
3896d4ce-c55d-4bf1-ae02-9cee2145850c,
3896d4ce-c55d-4bf1-ae02-9cee2145850c,
3896d4ce-c55d-4bf1-ae02-9cee2145850c
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=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same first party:
5f0f614c-43fc-420e-944b-4f0a0da990bf,
5f0f614c-43fc-420e-944b-4f0a0da990bf,
5f0f614c-43fc-420e-944b-4f0a0da990bf,
5f0f614c-43fc-420e-944b-4f0a0da990bf,
5f0f614c-43fc-420e-944b-4f0a0da990bf
result, different first party:
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${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:
c30feb74-0688-4e93-a1ee-945a342e2e51,
c30feb74-0688-4e93-a1ee-945a342e2e51,
c30feb74-0688-4e93-a1ee-945a342e2e51,
c30feb74-0688-4e93-a1ee-945a342e2e51,
c30feb74-0688-4e93-a1ee-945a342e2e51
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=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same first party:
a3efc9cf-e003-4db6-b541-110fd75a7184,
a3efc9cf-e003-4db6-b541-110fd75a7184,
a3efc9cf-e003-4db6-b541-110fd75a7184,
a3efc9cf-e003-4db6-b541-110fd75a7184,
a3efc9cf-e003-4db6-b541-110fd75a7184
result, different first party:
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${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:
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')
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: undefined
test failed: true, true, true, true, true
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same first party:
4301548a-9fe6-46c1-bab3-6eca1e419c61,
4301548a-9fe6-46c1-bab3-6eca1e419c61,
4301548a-9fe6-46c1-bab3-6eca1e419c61,
4301548a-9fe6-46c1-bab3-6eca1e419c61,
4301548a-9fe6-46c1-bab3-6eca1e419c61
result, different first party:
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url'),
Error: undefined is not an object (evaluating 'cacheKeys[0].url')
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${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:
e2799d44-532c-43fe-aee3-305e020ebb55,
e2799d44-532c-43fe-aee3-305e020ebb55,
e2799d44-532c-43fe-aee3-305e020ebb55,
e2799d44-532c-43fe-aee3-305e020ebb55,
e2799d44-532c-43fe-aee3-305e020ebb55
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
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(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same first party:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_http,
acc290ab-86e1-4a65-a011-a419f7d03e19_http,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_http,
b61e453f-87c4-4046-8412-86cc64f47f26_http,
ab0e3118-dd5d-42c5-9360-1498d215c6db_http
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${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:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_http,
2d8d4644-59cc-49ab-b560-db0182e57205_http,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_http,
c284751f-d3d5-4a49-90a7-1786cedf951a_http,
b688a717-f384-445f-a01e-81d6729c1b16_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(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same first party:
9f24c597-9428-48f7-82c0-54bef8109399_http,
ab7ef486-4382-4e3c-9436-e81372b1791a_http,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_http,
689ce941-b964-4248-98af-2ca5a24e06fe_http,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_http
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${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:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_http,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_http,
d052da24-bb9b-4e23-9a19-74172f96c9f3_http,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_http,
759b6820-1f15-49a2-88dc-5fdedc00222e_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(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same first party:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_http,
fe70b923-a206-4127-a628-4604f6e6d1c3_http,
0c3287cb-f64c-480d-93d8-96273ea64e19_http,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_http,
ed7e595a-d635-4336-968f-6a9b405276d0_http
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${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:
a58e9ddb-d732-4545-90a3-d35ace999f4f_http,
f1f7e315-bad6-4c05-85ee-ab121a223ebb_http,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64_http,
95d00574-70e7-43f2-8418-327685f9e1e3_http,
701a5795-8be0-47ad-ae4d-47be3c533e13_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(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same first party:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_http,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_http,
24f16af8-d55c-477a-b9a5-3684da77e4a9_http,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_http,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_http
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${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:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_http,
069cbeba-1a60-4873-8ac2-61702e957905_http,
886f1482-9db2-419b-95c6-31e8d3dc6795_http,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_http,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_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=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_js,
acc290ab-86e1-4a65-a011-a419f7d03e19_js,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_js,
b61e453f-87c4-4046-8412-86cc64f47f26_js,
ab0e3118-dd5d-42c5-9360-1498d215c6db_js
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_js,
2d8d4644-59cc-49ab-b560-db0182e57205_js,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_js,
c284751f-d3d5-4a49-90a7-1786cedf951a_js,
b688a717-f384-445f-a01e-81d6729c1b16_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=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
9f24c597-9428-48f7-82c0-54bef8109399_js,
ab7ef486-4382-4e3c-9436-e81372b1791a_js,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_js,
689ce941-b964-4248-98af-2ca5a24e06fe_js,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_js
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_js,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_js,
d052da24-bb9b-4e23-9a19-74172f96c9f3_js,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_js,
759b6820-1f15-49a2-88dc-5fdedc00222e_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=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_js,
fe70b923-a206-4127-a628-4604f6e6d1c3_js,
0c3287cb-f64c-480d-93d8-96273ea64e19_js,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_js,
ed7e595a-d635-4336-968f-6a9b405276d0_js
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
a58e9ddb-d732-4545-90a3-d35ace999f4f_js,
f1f7e315-bad6-4c05-85ee-ab121a223ebb_js,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64_js,
95d00574-70e7-43f2-8418-327685f9e1e3_js,
701a5795-8be0-47ad-ae4d-47be3c533e13_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=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_js,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_js,
24f16af8-d55c-477a-b9a5-3684da77e4a9_js,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_js,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_js
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same first party:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_js,
069cbeba-1a60-4873-8ac2-61702e957905_js,
886f1482-9db2-419b-95c6-31e8d3dc6795_js,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_js,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_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:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5,
acc290ab-86e1-4a65-a011-a419f7d03e19,
bb09f7dd-321e-44c0-acf2-035c497a8cf1,
b61e453f-87c4-4046-8412-86cc64f47f26,
ab0e3118-dd5d-42c5-9360-1498d215c6db
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:
3cd048f1-6d76-4501-ae18-a282f31e1a9b,
2d8d4644-59cc-49ab-b560-db0182e57205,
2f9f24ff-a8b2-4a2f-b508-2ac351011514,
c284751f-d3d5-4a49-90a7-1786cedf951a,
b688a717-f384-445f-a01e-81d6729c1b16
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:
9f24c597-9428-48f7-82c0-54bef8109399,
ab7ef486-4382-4e3c-9436-e81372b1791a,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355,
689ce941-b964-4248-98af-2ca5a24e06fe,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e
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:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c,
4f2fbebf-113b-4615-a05f-36b43c2f43f3,
d052da24-bb9b-4e23-9a19-74172f96c9f3,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e,
759b6820-1f15-49a2-88dc-5fdedc00222e
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:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0,
fe70b923-a206-4127-a628-4604f6e6d1c3,
0c3287cb-f64c-480d-93d8-96273ea64e19,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a,
ed7e595a-d635-4336-968f-6a9b405276d0
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:
a58e9ddb-d732-4545-90a3-d35ace999f4f,
f1f7e315-bad6-4c05-85ee-ab121a223ebb,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64,
95d00574-70e7-43f2-8418-327685f9e1e3,
701a5795-8be0-47ad-ae4d-47be3c533e13
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:
81c7bbbe-cae5-449c-8360-ca12f40eb74e,
0d523e04-9b00-4dd9-8f9b-307a98482fb2,
24f16af8-d55c-477a-b9a5-3684da77e4a9,
792a94b6-513d-4d69-90dc-d0f5883bdaa1,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d
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:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009,
069cbeba-1a60-4873-8ac2-61702e957905,
886f1482-9db2-419b-95c6-31e8d3dc6795,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a
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_28956393716472384,
fake_5399127314481376,
fake_5476711882704401,
fake_3239272773085766,
fake_14868842696890172
result, different first party:
fake_07923733227445195,
fake_4839183142068906,
fake_8892756876120245,
fake_4551363953270755,
fake_2598228419153654
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_21163419380658732,
fake_22599536122075747,
fake_8884231744083171,
fake_25068918738918056,
fake_5585784726703824
result, different first party:
fake_026798754370058075,
fake_7312199713937308,
fake_5901867897491258,
fake_29270430571288686,
fake_6926311556360902
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_10803857964949382,
fake_8558266418947131,
fake_7951274876549412,
fake_39132403071562605,
fake_6417480374775568
result, different first party:
fake_49911995540311715,
fake_2494828520461323,
fake_3380835636080388,
fake_5035715615588903,
fake_2759386945142943
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_3045141394386337,
fake_6290362506762432,
fake_12560565318335715,
fake_46771083334963914,
fake_8429239789437439
result, different first party:
fake_24873369689040303,
fake_6757355781854844,
fake_9125910872707967,
fake_022249133233595453,
fake_4795181215204074
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_8369318001210202,
fake_49798056382358324,
fake_1523877470545978,
fake_7897928959675069,
fake_2152794786833565
result, different first party:
fake_2578035630567108,
fake_03182633796878864,
fake_13702762160957715,
fake_203536595426129,
fake_42222267783166734
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_3360475034245287,
fake_5906436590695232,
fake_618035628536395,
fake_9397415682421315,
fake_41226204391973487
result, different first party:
fake_8165121683948258,
fake_5557534040693324,
fake_21546172046345435,
fake_4282959630734062,
fake_3227428810428534
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_3430557678090149,
fake_2706995537328811,
fake_25675808474791517,
fake_3760223535796734,
fake_5503091282880093
result, different first party:
fake_6140177804506577,
fake_6541654274084283,
fake_889270867111883,
fake_5799038128584362,
fake_18363783655986876
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_22444962131724555,
fake_35234528258213693,
fake_8504777328602435,
fake_8881318336143516,
fake_9233508028091661
result, different first party:
fake_463605060848598,
fake_9808807519228093,
fake_8524098197222643,
fake_5831009873137911,
fake_9293373844240378
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.
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
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
Unsupported
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:
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: (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
Unsupported
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:
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
Unsupported
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:
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: (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
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
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, 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
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: 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
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, 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, 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, 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, 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, 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, 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, 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, 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
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:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5,
acc290ab-86e1-4a65-a011-a419f7d03e19,
bb09f7dd-321e-44c0-acf2-035c497a8cf1,
b61e453f-87c4-4046-8412-86cc64f47f26,
ab0e3118-dd5d-42c5-9360-1498d215c6db
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:
3cd048f1-6d76-4501-ae18-a282f31e1a9b,
2d8d4644-59cc-49ab-b560-db0182e57205,
2f9f24ff-a8b2-4a2f-b508-2ac351011514,
c284751f-d3d5-4a49-90a7-1786cedf951a,
b688a717-f384-445f-a01e-81d6729c1b16
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:
9f24c597-9428-48f7-82c0-54bef8109399,
ab7ef486-4382-4e3c-9436-e81372b1791a,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355,
689ce941-b964-4248-98af-2ca5a24e06fe,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e
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:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c,
4f2fbebf-113b-4615-a05f-36b43c2f43f3,
d052da24-bb9b-4e23-9a19-74172f96c9f3,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e,
759b6820-1f15-49a2-88dc-5fdedc00222e
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:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0,
fe70b923-a206-4127-a628-4604f6e6d1c3,
0c3287cb-f64c-480d-93d8-96273ea64e19,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a,
ed7e595a-d635-4336-968f-6a9b405276d0
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:
81c7bbbe-cae5-449c-8360-ca12f40eb74e,
0d523e04-9b00-4dd9-8f9b-307a98482fb2,
24f16af8-d55c-477a-b9a5-3684da77e4a9,
792a94b6-513d-4d69-90dc-d0f5883bdaa1,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d
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:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009,
069cbeba-1a60-4873-8ac2-61702e957905,
886f1482-9db2-419b-95c6-31e8d3dc6795,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a
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=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h1.privacytests2.org:8901/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5,
acc290ab-86e1-4a65-a011-a419f7d03e19,
bb09f7dd-321e-44c0-acf2-035c497a8cf1,
b61e453f-87c4-4046-8412-86cc64f47f26,
ab0e3118-dd5d-42c5-9360-1498d215c6db
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${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: , , , ,
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: undefined
test failed: true, true, true, true, true
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h1.privacytests2.org:8901/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
9f24c597-9428-48f7-82c0-54bef8109399,
ab7ef486-4382-4e3c-9436-e81372b1791a,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355,
689ce941-b964-4248-98af-2ca5a24e06fe,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${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: , , , ,
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: undefined
test failed: true, true, true, true, true
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h1.privacytests2.org:8901/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0,
fe70b923-a206-4127-a628-4604f6e6d1c3,
0c3287cb-f64c-480d-93d8-96273ea64e19,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a,
ed7e595a-d635-4336-968f-6a9b405276d0
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${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:
a58e9ddb-d732-4545-90a3-d35ace999f4f,
f1f7e315-bad6-4c05-85ee-ab121a223ebb,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64,
95d00574-70e7-43f2-8418-327685f9e1e3,
701a5795-8be0-47ad-ae4d-47be3c533e13
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=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h1.privacytests2.org:8901/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
81c7bbbe-cae5-449c-8360-ca12f40eb74e,
0d523e04-9b00-4dd9-8f9b-307a98482fb2,
24f16af8-d55c-477a-b9a5-3684da77e4a9,
792a94b6-513d-4d69-90dc-d0f5883bdaa1,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${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: , , , ,
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: undefined
test failed: true, true, true, true, true
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=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h2.privacytests2.org:8902/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5,
acc290ab-86e1-4a65-a011-a419f7d03e19,
bb09f7dd-321e-44c0-acf2-035c497a8cf1,
b61e453f-87c4-4046-8412-86cc64f47f26,
ab0e3118-dd5d-42c5-9360-1498d215c6db
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${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:
3cd048f1-6d76-4501-ae18-a282f31e1a9b,
2d8d4644-59cc-49ab-b560-db0182e57205,
2f9f24ff-a8b2-4a2f-b508-2ac351011514,
c284751f-d3d5-4a49-90a7-1786cedf951a,
b688a717-f384-445f-a01e-81d6729c1b16
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=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h2.privacytests2.org:8902/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
9f24c597-9428-48f7-82c0-54bef8109399,
ab7ef486-4382-4e3c-9436-e81372b1791a,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355,
689ce941-b964-4248-98af-2ca5a24e06fe,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${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:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c,
4f2fbebf-113b-4615-a05f-36b43c2f43f3,
d052da24-bb9b-4e23-9a19-74172f96c9f3,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e,
759b6820-1f15-49a2-88dc-5fdedc00222e
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=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h2.privacytests2.org:8902/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0,
fe70b923-a206-4127-a628-4604f6e6d1c3,
0c3287cb-f64c-480d-93d8-96273ea64e19,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a,
ed7e595a-d635-4336-968f-6a9b405276d0
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${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:
a58e9ddb-d732-4545-90a3-d35ace999f4f,
f1f7e315-bad6-4c05-85ee-ab121a223ebb,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64,
95d00574-70e7-43f2-8418-327685f9e1e3,
701a5795-8be0-47ad-ae4d-47be3c533e13
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=${secret}`, { cache: 'no-store' });
      }
read: async () => {
        const response = await fetch('https://h2.privacytests2.org:8902/?mode=read', { cache: 'no-store' });
        return await response.text();
      }
result, same first party:
81c7bbbe-cae5-449c-8360-ca12f40eb74e,
0d523e04-9b00-4dd9-8f9b-307a98482fb2,
24f16af8-d55c-477a-b9a5-3684da77e4a9,
792a94b6-513d-4d69-90dc-d0f5883bdaa1,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Passed
write: async (secret) => {
        await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${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:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009,
069cbeba-1a60-4873-8ac2-61702e957905,
886f1482-9db2-419b-95c6-31e8d3dc6795,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a
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:
423c91367e77f346f4ea0943f13dcbaf,
b16b3b5ccfe871c5418fac01798faa90,
cf6b369c63ce5dc19d769cf804e64f57,
43a003b0c678f5d122f76a0773a206e3,
149ba5b2fdcf49954bf1002e6013fa11
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:
7e66807af53a384641be586fa26e0e8c,
250ae55e7a523018becf2880b130de86,
395d6e4bbf6b080fd8040c5eabe4b0c0,
f69d189845f031044b3bad0c57edce4a,
0f46737287514eeae7fefa6bee6d290d
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:
5839dc5e16647aaf1f0902ba0f3471eb,
f9b7de9d8122c349e14169bd7d446117,
67c88d260f1732d68a7ff376121c3330,
8bdbcde0c342cdebfe01be379bacfae1,
37e14c241013b937dab22b331a1e4c68
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:
755c3e095ad2238457e2877897a60143,
9a9bc32705495e4a127370a183118d03,
4ce77d09f6b9e622e9dd984b147357b9,
53374399d1b5c08f47e96f7294cd74ab,
d39eabe550591efe660bacbba86ade21
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:
317fc0e7cda86858819cab934249d542,
dc92f18c2390b6c325f3d260d6fa3632,
1221a0086706a7f55181595d56c1156d,
0211b28372722ef187484c7730735ade,
b5533511b7ac97ba577bdcbfdccbb307
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:
9a32378cfd17303b4cdaf9d9e57ef137,
7d5f175d604c96ec10d74e9c3b611334,
70644d4c038a0874987adf9c5325bce1,
ad3870b00546a965f692e8eb7851e7d7,
fcecb83074fce4885c77ee0d4ae85f18
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:
fef46b9cb952b3f90efb7e7bc54ac9af,
b18ae75d09ca1690e52c4e0bbc263f1d,
9dac451bc3a58b2df11bbd7171cd9d3f,
2efa8d4516b2ece4978e28acfa316e1d,
78b190a0b1d3659c1cf201b1cfc7b42f
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
The HTTP Strict-Transport-Security response header allows a website to signal that it should only be accessed via HTTPS. The browser remembers this directive in a database, but if this database is not partitioned, then it can be used to track users across websites."
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
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
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
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
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
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
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
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
HSTS cache (fetch)
The HTTP Strict-Transport-Security response header allows a website to signal that it should only be accessed via HTTPS. The browser remembers this directive in a database, but if this database is not partitioned, then it can be used to track users across websites."
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
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
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
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
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
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
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
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
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, 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
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, 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, 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, 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, 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, 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, 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, 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, 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
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:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5,
acc290ab-86e1-4a65-a011-a419f7d03e19,
bb09f7dd-321e-44c0-acf2-035c497a8cf1,
b61e453f-87c4-4046-8412-86cc64f47f26,
ab0e3118-dd5d-42c5-9360-1498d215c6db
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:
3cd048f1-6d76-4501-ae18-a282f31e1a9b,
2d8d4644-59cc-49ab-b560-db0182e57205,
2f9f24ff-a8b2-4a2f-b508-2ac351011514,
c284751f-d3d5-4a49-90a7-1786cedf951a,
b688a717-f384-445f-a01e-81d6729c1b16
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:
9f24c597-9428-48f7-82c0-54bef8109399,
ab7ef486-4382-4e3c-9436-e81372b1791a,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355,
689ce941-b964-4248-98af-2ca5a24e06fe,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e
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:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c,
4f2fbebf-113b-4615-a05f-36b43c2f43f3,
d052da24-bb9b-4e23-9a19-74172f96c9f3,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e,
759b6820-1f15-49a2-88dc-5fdedc00222e
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:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0,
fe70b923-a206-4127-a628-4604f6e6d1c3,
0c3287cb-f64c-480d-93d8-96273ea64e19,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a,
ed7e595a-d635-4336-968f-6a9b405276d0
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:
a58e9ddb-d732-4545-90a3-d35ace999f4f,
f1f7e315-bad6-4c05-85ee-ab121a223ebb,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64,
95d00574-70e7-43f2-8418-327685f9e1e3,
701a5795-8be0-47ad-ae4d-47be3c533e13
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:
81c7bbbe-cae5-449c-8360-ca12f40eb74e,
0d523e04-9b00-4dd9-8f9b-307a98482fb2,
24f16af8-d55c-477a-b9a5-3684da77e4a9,
792a94b6-513d-4d69-90dc-d0f5883bdaa1,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d
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:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009,
069cbeba-1a60-4873-8ac2-61702e957905,
886f1482-9db2-419b-95c6-31e8d3dc6795,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a
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:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5,
acc290ab-86e1-4a65-a011-a419f7d03e19,
bb09f7dd-321e-44c0-acf2-035c497a8cf1,
b61e453f-87c4-4046-8412-86cc64f47f26,
ab0e3118-dd5d-42c5-9360-1498d215c6db
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:
3cd048f1-6d76-4501-ae18-a282f31e1a9b,
2d8d4644-59cc-49ab-b560-db0182e57205,
2f9f24ff-a8b2-4a2f-b508-2ac351011514,
c284751f-d3d5-4a49-90a7-1786cedf951a,
b688a717-f384-445f-a01e-81d6729c1b16
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:
9f24c597-9428-48f7-82c0-54bef8109399,
ab7ef486-4382-4e3c-9436-e81372b1791a,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355,
689ce941-b964-4248-98af-2ca5a24e06fe,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e
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:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c,
4f2fbebf-113b-4615-a05f-36b43c2f43f3,
d052da24-bb9b-4e23-9a19-74172f96c9f3,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e,
759b6820-1f15-49a2-88dc-5fdedc00222e
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:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0,
fe70b923-a206-4127-a628-4604f6e6d1c3,
0c3287cb-f64c-480d-93d8-96273ea64e19,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a,
ed7e595a-d635-4336-968f-6a9b405276d0
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:
a58e9ddb-d732-4545-90a3-d35ace999f4f,
f1f7e315-bad6-4c05-85ee-ab121a223ebb,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64,
95d00574-70e7-43f2-8418-327685f9e1e3,
701a5795-8be0-47ad-ae4d-47be3c533e13
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:
81c7bbbe-cae5-449c-8360-ca12f40eb74e,
0d523e04-9b00-4dd9-8f9b-307a98482fb2,
24f16af8-d55c-477a-b9a5-3684da77e4a9,
792a94b6-513d-4d69-90dc-d0f5883bdaa1,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d
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:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009,
069cbeba-1a60-4873-8ac2-61702e957905,
886f1482-9db2-419b-95c6-31e8d3dc6795,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a
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:
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')
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: undefined
test failed: true, true, true, true, true
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:
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')
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: undefined
test failed: true, true, true, true, true
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:
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')
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: undefined
test failed: true, true, true, true, true
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:
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')
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: undefined
test failed: true, true, true, true, true
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:
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')
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: undefined
test failed: true, true, true, true, true
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:
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')
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: undefined
test failed: true, true, true, true, true
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:
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')
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: undefined
test failed: true, true, true, true, true
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:
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')
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: undefined
test failed: true, true, true, true, true
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.
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
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
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
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
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
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
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
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
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, 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, 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, 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, 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, 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, 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, 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, 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
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.
Unsupported
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:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
result, different first party: none, none, none, none, none
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
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:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
result, different first party: none, none, none, none, none
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
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:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
result, different first party: none, none, none, none, none
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
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:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
result, different first party: none, none, none, none, none
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
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:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
result, different first party: none, none, none, none, none
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
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:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
result, different first party: none, none, none, none, none
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
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:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
result, different first party: none, none, none, none, none
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
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:
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported
result, different first party: none, none, none, none, none
unsupported: true, true, true, true, true
passed: undefined
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:
64db882abfc1cba6dc01ed0f4c5c9883becd4eca51529eb3724fd71322be7163,
33f8df20ba496b255fd0c2961e6082c5ece7ba1fba516e000983350de258651a,
0ac8405be33f250a625a1cfd10675e174cf6527cb2aa9fb57b937e3c5fe15c3a,
67579beaa5484921e90a439de715350d90a54a1ff9b1c8df461a887947d707c4,
9603dbdf55aaa9df437f6ecd682fb8ceb07649bae3fd56b80a4daa2b34a23818
result, different first party:
f885a04d72a85bd2a19fd5920d1a7ed2e85ec36139b75c8157802369408e923c,
e4dd8032aa174cc3f473232e3e54496209f5b309457c95d12ea27caf9ef8c9a2,
eb30e9429caf37d7faea28f394ca50cfa90ddce5bf2194031be628b83c77045e,
173ad739f6f1779e58938e44165790b7db4d9779fa21f4fdacece8668fe8d3c0,
f6278b5605501f745b8076607a370d585a46580b2c9a2b56c4b69f26f020f8d1
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:
26f0d7f12e78e53a606476f01aa5d9e41e0937d892312d7d6302d7954113323b,
041f2bd00995b5fe2f05ce58f2ddf974158f55f43620bded23dbffe14ae888b3,
613ef1bd83ccc5e58588534474e332e25bfb8ebb61967c6b5b82ff1f9354408b,
4036f1e00372aaf1ed669c5bb103879a0cee1a6eade154c25580aa012c9273cb,
0a57d256a2e3233e8c8a00f6e5f9d442b16e7b79daea856945e64f4afcea1e1f
result, different first party:
0750dcb9c88e56f1079ef03426a40b6a1ad55ea08f6d56f260057fa767abb8f9,
6b7129fd9aea1f1467719ca2d54b8921f48414f8c0dbcbb8356eccc4e6ba19ba,
c8d233c718f7a8ce06a47106157ca1aca20407bfa1945afa62d41509c51bda9b,
8b05bee7525cb760373d19c77306cdf65c200e65d981bb7098fd779d563926e3,
d182644f27d7b15eef51ba2ca494f01a52b7db25081a41a9286de0d89ab16c3f
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:
a3ab72407fb45f79ed8cca806cbb772f832f4324878b1863f893bad901962b26,
f175b20e1f239cf0839e82baff0ca47d2c26d8f3e595a76ae8a38ac4e44b0812,
35a5cda5bdb8e3c6ecff5694f0a706d1094b010b86cdd867933b7cb1f982ddfd,
456003e1351bf6ab7b676235f31c8c52b07ddd052a72bc3e6466721e1627adeb,
0b51bf204a6293d0fd59152e5b87ca59df17b588379b703cae0b66c8b52060ce
result, different first party:
4efdae2425cd34d31c93fce7d5433970f5276218979dd63de6a2eb78a532da74,
d45012e049e9f6e7bf0c2e8b5e774cd0fc2f5ad36c7a8ad4dd9826974d116bdf,
b373739c752e271105a9b399cd63f062e34c243062f7f0495c2e3d7fe159db56,
703636a3329f519f5e9f0bd64d3be3c8c4c7d99ab70baa82c7b7f4892c0013e9,
3a392c54a5d4f3fa88152b6884b1daf15c354505b3f4972b488bd1e0e60750b4
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:
e00ac5d5022e846a2638c960b8654e120cf126a3a58b07f06e3708d401795e5d,
3d5018f70a5155fb91298d5c5abd5ad001d5ad5362cabbbe8f568cb121ba00db,
77cad302ac19f7bcafdeccc59d528b60823b6e330c7c25422e53dcbcfdb35d01,
3c15d4da6ab9b831c65d3ae949480f51dd3c3a8a1a5eccf68bb9745f68d1c140,
5f1a9e40c00cc9dcff2f2051011b6b3e05477bd1b36c48d147b5976a73f834ce
result, different first party:
045cf5b1412c3e7637fe19aed64ae96bcb03a47c8d34366be34576e8e071ac41,
d19308ccbfb7416f95038a8b228b42566ae88ab29c8dc59b1648eff6e1e1c920,
6ba4e8b2bb75123aa25ec349b1fc0270015626512edd6bd3b0f8abe8201090a4,
2a11ea350b8d94dfdd370d35a7f89dc138965cf26202a39999c32c8320da755c,
4a7ebc4259df3c6000a86d505b76c30b8b22de3061febf02775627fec448a438
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:
93f34eb3682db5e37934729f7cc24cc798ee28397f538e4f5ec6c1e5a494e1bc,
2bd20cf06b2062aa08e8e88c05fc0bd356ef8eda08925abe3793c431d781c6f2,
1f6f6e458f45021d3c60fe5f2670505692d5849c2094b23f0afc28d62e4dc865,
7327f2c5278a7289af9cebdf55fc256e8e49c8e1f77285ac5513cf5f9a694bba,
cdfeccbc48a984bb993922d92541e87d5a4f1917de9160629af45b17a72b8447
result, different first party:
cdc629f9d6cae83a9e10cda77a1d0f12a8feb614660fc41c685f30534bc1fe63,
a3cf423d832541d2119d7b285481d455815b57536a21d202a65eed509f3c6930,
74ff76129ac5fc00b75b8b26c4f238cdb80c8fafe83ac156004122c5dc11d9cc,
0d6cc7d2a84b7d3a56bffa4400557e1b7bd448677b998158d6f06acd0de386b9,
0e3b0fbafaffd7d9efc41784641d54e2cfc013b9b5c9f94c7b0539a7ddb60d98
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:
0f7c3571631b19b463c61f9850b0ce5245af35e0513786da16efbc0e19014d4e,
81440f43ff4c3e05ad7e21a63fbf072410b88b1933e02551070009fdad20dd9b,
64a51df771a51dad56b7ff1f11f1fb74bbb56de11eab34d08b58d1778e7b5a06,
e70d8648210b8a44168d9385d32c62fe3959375f072992e74355719c57c2cc4d,
c663426b2bf55c9b5adc5c048c3c49dc9b69aa927e369ac8f5f3fcc7b384d5f8
result, different first party:
c91f682e943824d72fa94762b75b368bc815d9d25fc738a621e62a3a1d1c69af,
3bd78ad4a67066ecd548df39c51a0b9c0cd7f4e203bc775448b6e420dbfddb0e,
1ce85533ea434dbc255b67400950fd1bc653a5ddb7d6e540f98d450d73a89cd5,
b07d13625f94dba528968020aa6400e3eb47a25851d34e0b5c6ae118b8eb0d75,
1982eeae257583120632bd460ba86c6cc6b51f9a1ecad3e7efc4aab496c3d932
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:
319f5c971597635a2d3bb7b999156e32df8226a1ad7354aabc3b5343482169ff,
11c1e928222b462b443382dd9b452bcfbf46e6d592a763857ea43eca2d7a1d40,
e0102769d008d5639d32fb7ac8fe9d52589d0e68558090a45285e2afbe539961,
2079cbe993d4f895b330654079ef5757002e1a5575ded29b7f8e35f7486f1ce2,
f35f82a15420542aebe2653fe9299b5eef95096d83a53cea2201e438b229cb82
result, different first party:
1e0c78b3682f3c4205612f48c78edfdc1b1c60d35410e2246cfab5efadbf89e1,
8920d46b2a87b713abec9ac63551e37fd193b37dbd3b44680fccc6417632a50a,
a38b2ac780c45d6943ef5293fdfb477a2ce4279bd539c9437f70ee5c4bf91a72,
34fdda6b7a523b95907f42374626db413ff2b7217901fbbab97780fcf40e50ca,
4ea12bc34c9b023b76e077d70bf68bece9fb5c1dbf4bbfa9f6478f05fa761c21
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:
657982c7f9934153f6d4ebc1d78c467da708b770f5350e5fa24b5b6c74bec080,
da1463016a51f1ca4598d8edd6e1c22476a2269840fe598314d1a52d65679772,
464872f94417065543dc70590dbfbe95306c82829fe2af181ce38f8d8959a170,
5ae78901303352172689324e0fad08bdf664ae4bac745b9720aa893ee7c2be91,
16ac013e5cebb153b056d45a105b2c09964846fa4c9b48a2682ff5584ee33bac
result, different first party:
52a2f07dcacd54dc95477ed4eed12f59acd3465593246aca8f20b59a7e3f3a94,
b14aeefafae1dcfc5457b5f203f003eea95a9a5ece286dd571c5538bc344c4b3,
37836d45a535f420a5eec3efb0716438c1f5d382fd15fd7790fd3ba0ca45001a,
61c09cd1cb3dbdae574157a55c09a9d6da9962de6337371259292641231edf82,
9ed161ef7e58090ced6e163d20f74d90709f93aba5566da7f492e6a5b535919f
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, 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
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/,
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
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:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5,
acc290ab-86e1-4a65-a011-a419f7d03e19,
bb09f7dd-321e-44c0-acf2-035c497a8cf1,
b61e453f-87c4-4046-8412-86cc64f47f26,
ab0e3118-dd5d-42c5-9360-1498d215c6db
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:
3cd048f1-6d76-4501-ae18-a282f31e1a9b,
2d8d4644-59cc-49ab-b560-db0182e57205,
2f9f24ff-a8b2-4a2f-b508-2ac351011514,
c284751f-d3d5-4a49-90a7-1786cedf951a,
b688a717-f384-445f-a01e-81d6729c1b16
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:
9f24c597-9428-48f7-82c0-54bef8109399,
ab7ef486-4382-4e3c-9436-e81372b1791a,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355,
689ce941-b964-4248-98af-2ca5a24e06fe,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e
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:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c,
4f2fbebf-113b-4615-a05f-36b43c2f43f3,
d052da24-bb9b-4e23-9a19-74172f96c9f3,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e,
759b6820-1f15-49a2-88dc-5fdedc00222e
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:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0,
fe70b923-a206-4127-a628-4604f6e6d1c3,
0c3287cb-f64c-480d-93d8-96273ea64e19,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a,
ed7e595a-d635-4336-968f-6a9b405276d0
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:
a58e9ddb-d732-4545-90a3-d35ace999f4f,
f1f7e315-bad6-4c05-85ee-ab121a223ebb,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64,
95d00574-70e7-43f2-8418-327685f9e1e3,
701a5795-8be0-47ad-ae4d-47be3c533e13
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:
81c7bbbe-cae5-449c-8360-ca12f40eb74e,
0d523e04-9b00-4dd9-8f9b-307a98482fb2,
24f16af8-d55c-477a-b9a5-3684da77e4a9,
792a94b6-513d-4d69-90dc-d0f5883bdaa1,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d
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:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009,
069cbeba-1a60-4873-8ac2-61702e957905,
886f1482-9db2-419b-95c6-31e8d3dc6795,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a
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_b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5,
name_acc290ab-86e1-4a65-a011-a419f7d03e19,
name_bb09f7dd-321e-44c0-acf2-035c497a8cf1,
name_b61e453f-87c4-4046-8412-86cc64f47f26,
name_ab0e3118-dd5d-42c5-9360-1498d215c6db
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.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_3cd048f1-6d76-4501-ae18-a282f31e1a9b,
name_2d8d4644-59cc-49ab-b560-db0182e57205,
name_2f9f24ff-a8b2-4a2f-b508-2ac351011514,
name_c284751f-d3d5-4a49-90a7-1786cedf951a,
name_b688a717-f384-445f-a01e-81d6729c1b16
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.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_9f24c597-9428-48f7-82c0-54bef8109399,
name_ab7ef486-4382-4e3c-9436-e81372b1791a,
name_8eb02738-3cdc-46a0-8d64-d2b08f0f0355,
name_689ce941-b964-4248-98af-2ca5a24e06fe,
name_f878fb83-b1dd-49b2-bd6e-2115809eaf4e
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.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c,
name_4f2fbebf-113b-4615-a05f-36b43c2f43f3,
name_d052da24-bb9b-4e23-9a19-74172f96c9f3,
name_bac9b718-8a5f-4a5c-920f-ca26a2eae38e,
name_759b6820-1f15-49a2-88dc-5fdedc00222e
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.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_eeb01fa8-ffd5-462c-aae7-51ded204c3d0,
name_fe70b923-a206-4127-a628-4604f6e6d1c3,
name_0c3287cb-f64c-480d-93d8-96273ea64e19,
name_beaeefb7-187f-4cc4-89e7-3dd14de2aa5a,
name_ed7e595a-d635-4336-968f-6a9b405276d0
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.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_a58e9ddb-d732-4545-90a3-d35ace999f4f,
name_f1f7e315-bad6-4c05-85ee-ab121a223ebb,
name_9e7f96f7-8e43-4692-a68e-6e7c4b84bf64,
name_95d00574-70e7-43f2-8418-327685f9e1e3,
name_701a5795-8be0-47ad-ae4d-47be3c533e13
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.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_81c7bbbe-cae5-449c-8360-ca12f40eb74e,
name_0d523e04-9b00-4dd9-8f9b-307a98482fb2,
name_24f16af8-d55c-477a-b9a5-3684da77e4a9,
name_792a94b6-513d-4d69-90dc-d0f5883bdaa1,
name_f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d
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.name = 'name_' + secret; }
read: () => window.name
result, same first party:
name_6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009,
name_069cbeba-1a60-4873-8ac2-61702e957905,
name_886f1482-9db2-419b-95c6-31e8d3dc6795,
name_c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5,
name_5eaf40aa-32b5-42c7-b95d-0b1fa780b33a
result, different first party: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
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
Checks to see if the browser stops loading an insecure website and warns the user before giving them the option to continue. Known as HTTPS-Only Mode in some browsers.
Failed
passed: false, false, false, false, false
result:
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded
Failed
passed: false, false, false, false, false
result:
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded
Failed
passed: false, false, false, false, false
result:
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded
Failed
passed: false, false, false, false, false
result:
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded
Failed
passed: false, false, false, false, false
result:
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded
Failed
passed: false, false, false, false, false
result:
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded
Failed
passed: false, false, false, false, false
result:
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded
Failed
passed: false, false, false, false, false
result:
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website loaded,
Insecure website 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, true
passed: true, true, true, true, true
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
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, true
passed: true, true, true, true, true
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
Passed
upgraded: true, true, true, true, true
passed: true, true, true, true, true
Failed
upgraded: false, false, false, false, false
passed: false, false, false, false, false
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, 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
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, 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: 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: 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: blocked, blocked, blocked, blocked, blocked
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.
Failed
SNI_status: plaintext
passed: false, false, false, false, false
Failed
SNI_status: plaintext
passed: false, false, false, false, false
Failed
SNI_status: plaintext
passed: false, false, false, false, false
Failed
SNI_status: plaintext
passed: false, false, false, false, false
Failed
SNI_status: plaintext
passed: false, false, false, false, false
Failed
SNI_status: plaintext
passed: false, false, false, false, false
Failed
SNI_status: plaintext
passed: false, false, false, false, false
Failed
SNI_status: plaintext
passed: false, false, false, false, false
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.
Failed
header value: undefined
passed: false, false, false, false, false
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
Failed
header value: undefined
passed: false, false, false, false, false
Failed
header value: undefined
passed: false, false, false, false, false
Failed
header value: undefined
passed: false, false, false, false, false
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.
Failed
passed: false, false, false, false, false
Failed
passed: false, false, false, false, false
Failed
passed: false, false, false, false, false
Failed
passed: false, false, false, false, false
Failed
passed: false, false, false, false, false
Failed
passed: false, false, false, false, false
Failed
passed: false, false, false, false, false
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, false, false, false, false
Failed
passed: false, false, false, false, false
Failed
passed: false, false, false, false, false
Failed
passed: false, false, false, false, false
Failed
passed: false, false, false, false, false
Failed
passed: false, false, false, false, false
Failed
passed: false, false, false, false, false
Failed
passed: false, false, false, false, false
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, 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
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
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
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
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, false
passed: false, false, 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
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
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
Failed
IsTorExit: false, false, false, false, false
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, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
__hssc
HubSpot tracking parameter
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
__hstc
HubSpot tracking parameter
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
__s
Drip.com email address tracking parameter
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
_hsenc
HubSpot tracking parameter
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
_openstat
Yandex tracking parameter
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
dclid
DoubleClick Click ID (Google)
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
fbclid
Facebook Click Identifier
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
gclid
Google Click Identifier
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
hsCtaTracking
HubSpot tracking parameter
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
mc_eid
Mailchimp Email ID (email recipient's address)
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
mkt_tok
Adobe Marketo tracking parameter
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
ml_subscriber
MailerLite email tracking
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
ml_subscriber_hash
MailerLite email tracking
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
msclkid
Microsoft Click ID
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
oly_anon_id
Omeda marketing 'anonymous' customer id
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
oly_enc_id
Omeda marketing 'known' customer id
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
rb_clickid
Unknown high-entropy tracking parameter
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
s_cid
Adobe Site Catalyst tracking parameter
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
vero_conv
Vero tracking parameter
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
vero_id
Vero tracking parameter
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
wickedid
Wicked Reports e-commerce tracking
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
yclid
Yandex Click ID
Passed
passed: true, true, true, true, true
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
passed: false, false, false, false, false
Failed
value: 5389367206986753
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, 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
Failed
url: https://munchkin.marketo.net/munchkin.js
passed: , false
Failed
url: https://munchkin.marketo.net/munchkin.js
passed: false, 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
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, true
Failed
url: https://dpm.demdex.net/ibs
passed: false, false, 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, false, false, false
Failed
url: https://dpm.demdex.net/ibs
passed: false, false, 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, false, false
Failed
url: https://dpm.demdex.net/ibs
passed: false, false, 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, true
Failed
url: https://s.amazon-adsystem.com/dcm
passed: false, false, false, false, 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, false
Failed
url: https://s.amazon-adsystem.com/dcm
passed: false, false, false, false, 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
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, true
Failed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: false, false, 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, false, false
Failed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: false, false, 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, 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, true
Failed
url: https://bat.bing.com/bat.js
passed: false, false, false, false, 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, false, false, false, false
Failed
url: https://bat.bing.com/bat.js
passed: false, false, false, false, false
Passed
url: https://bat.bing.com/bat.js
Failed
url: https://bat.bing.com/bat.js
passed: false, false, false, false
Failed
url: https://bat.bing.com/bat.js
passed: false, false, 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, 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
Failed
url: https://static.chartbeat.com/js/chartbeat.js
passed: false, false, 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
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, true
Failed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: false, false, false, false, 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, false
Failed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: false, false, false, false, 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
Failed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: false, false, 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, 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
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
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, true
Failed
url: https://connect.facebook.net/en_US/fbevents.js
passed: false, false, 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
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
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, 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/
Passed
url: https://www.google.com/pagead/1p-user-list/
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: , false
Passed
url: https://www.google.com/pagead/1p-user-list/
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, true
Passed
url: https://google-analytics.com/urchin.js
Passed
url: https://google-analytics.com/urchin.js
passed: true, true, true, true, true
Passed
url: https://google-analytics.com/urchin.js
Passed
url: https://google-analytics.com/urchin.js
Passed
url: https://google-analytics.com/urchin.js
passed: true, true, true, true, true
Passed
url: https://google-analytics.com/urchin.js
Passed
url: https://google-analytics.com/urchin.js
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, true
Passed
url: 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, true
Passed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
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, false, false, false
Failed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: , 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, true
Failed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: , false
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
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
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, true
Failed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: false, false, 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, false
Failed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: false, false, 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, false
Failed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: false, 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
Failed
url: https://pixel.quantserve.com/pixel
passed: false, false, false, false
Passed
url: https://pixel.quantserve.com/pixel
passed: true, true, true, true, true
Failed
url: https://pixel.quantserve.com/pixel
passed: false, false, false, false, false
Failed
url: https://pixel.quantserve.com/pixel
passed: false, false, false, false, false
Passed
url: https://pixel.quantserve.com/pixel
passed: true, true, true, true, true
Failed
url: https://pixel.quantserve.com/pixel
passed: false, false, false, false
Failed
url: https://pixel.quantserve.com/pixel
passed: false, false, false, false, false
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, 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
Failed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: false, false, false
Failed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: false
Passed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: true, true, true, true, true
Failed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: false, 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, true
Failed
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
passed: false, false, 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, false, 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
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, true
Failed
url: https://t.co/i/adsct
passed: false, false, false, false
Passed
url: https://t.co/i/adsct
passed: true, true, true, true, true
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
Passed
url: https://t.co/i/adsct
Failed
url: https://t.co/i/adsct
passed: 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, 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
Failed
url: https://yandex.ru/ads/system/header-bidding.js
passed: false, false, false, false, false
Passed
url: https://yandex.ru/ads/system/header-bidding.js
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
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.
Failed
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: h3, h3, h3, h3, h3
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
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: h3, h3, h3, h3, h3
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
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: h3, h3, h3, h3, h3
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
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: h3, h3, h3, h3, h3
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
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: h3, h3, h3, h3, h3
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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
Failed
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: h3, h3, h3, h3, h3
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
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: h3, h3, h3, h3, h3
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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.
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_1p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_1p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_1p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_1p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_1p
result, different session:
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_1p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_1p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_1p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_1p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${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:
3896d4ce-c55d-4bf1-ae02-9cee2145850c_1p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_1p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_1p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_1p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_1p
result, different session:
3896d4ce-c55d-4bf1-ae02-9cee2145850c_1p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_1p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_1p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_1p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
5f0f614c-43fc-420e-944b-4f0a0da990bf_1p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_1p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_1p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_1p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_1p
result, different session:
5f0f614c-43fc-420e-944b-4f0a0da990bf_1p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_1p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_1p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_1p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${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:
c30feb74-0688-4e93-a1ee-945a342e2e51_1p,
c30feb74-0688-4e93-a1ee-945a342e2e51_1p,
c30feb74-0688-4e93-a1ee-945a342e2e51_1p,
c30feb74-0688-4e93-a1ee-945a342e2e51_1p,
c30feb74-0688-4e93-a1ee-945a342e2e51_1p
result, different session:
c30feb74-0688-4e93-a1ee-945a342e2e51_1p,
c30feb74-0688-4e93-a1ee-945a342e2e51_1p,
c30feb74-0688-4e93-a1ee-945a342e2e51_1p,
c30feb74-0688-4e93-a1ee-945a342e2e51_1p,
c30feb74-0688-4e93-a1ee-945a342e2e51_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
a3efc9cf-e003-4db6-b541-110fd75a7184_1p,
a3efc9cf-e003-4db6-b541-110fd75a7184_1p,
a3efc9cf-e003-4db6-b541-110fd75a7184_1p,
a3efc9cf-e003-4db6-b541-110fd75a7184_1p,
a3efc9cf-e003-4db6-b541-110fd75a7184_1p
result, different session:
a3efc9cf-e003-4db6-b541-110fd75a7184_1p,
a3efc9cf-e003-4db6-b541-110fd75a7184_1p,
a3efc9cf-e003-4db6-b541-110fd75a7184_1p,
a3efc9cf-e003-4db6-b541-110fd75a7184_1p,
a3efc9cf-e003-4db6-b541-110fd75a7184_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Unsupported
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${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: 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')
result, different session:
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: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
4301548a-9fe6-46c1-bab3-6eca1e419c61_1p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_1p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_1p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_1p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_1p
result, different session:
4301548a-9fe6-46c1-bab3-6eca1e419c61_1p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_1p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_1p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_1p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${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:
e2799d44-532c-43fe-aee3-305e020ebb55_1p,
e2799d44-532c-43fe-aee3-305e020ebb55_1p,
e2799d44-532c-43fe-aee3-305e020ebb55_1p,
e2799d44-532c-43fe-aee3-305e020ebb55_1p,
e2799d44-532c-43fe-aee3-305e020ebb55_1p
result, different session:
e2799d44-532c-43fe-aee3-305e020ebb55_1p,
e2799d44-532c-43fe-aee3-305e020ebb55_1p,
e2799d44-532c-43fe-aee3-305e020ebb55_1p,
e2799d44-532c-43fe-aee3-305e020ebb55_1p,
e2799d44-532c-43fe-aee3-305e020ebb55_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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.
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(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_1p_http,
acc290ab-86e1-4a65-a011-a419f7d03e19_1p_http,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_1p_http,
b61e453f-87c4-4046-8412-86cc64f47f26_1p_http,
ab0e3118-dd5d-42c5-9360-1498d215c6db_1p_http
result, different session:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_1p_http,
acc290ab-86e1-4a65-a011-a419f7d03e19_1p_http,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_1p_http,
b61e453f-87c4-4046-8412-86cc64f47f26_1p_http,
ab0e3118-dd5d-42c5-9360-1498d215c6db_1p_http
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${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:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_1p_http,
2d8d4644-59cc-49ab-b560-db0182e57205_1p_http,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_1p_http,
c284751f-d3d5-4a49-90a7-1786cedf951a_1p_http,
b688a717-f384-445f-a01e-81d6729c1b16_1p_http
result, different session:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_1p_http,
2d8d4644-59cc-49ab-b560-db0182e57205_1p_http,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_1p_http,
c284751f-d3d5-4a49-90a7-1786cedf951a_1p_http,
b688a717-f384-445f-a01e-81d6729c1b16_1p_http
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, 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(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
9f24c597-9428-48f7-82c0-54bef8109399_1p_http,
ab7ef486-4382-4e3c-9436-e81372b1791a_1p_http,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_1p_http,
689ce941-b964-4248-98af-2ca5a24e06fe_1p_http,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_1p_http
result, different session:
9f24c597-9428-48f7-82c0-54bef8109399_1p_http,
ab7ef486-4382-4e3c-9436-e81372b1791a_1p_http,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_1p_http,
689ce941-b964-4248-98af-2ca5a24e06fe_1p_http,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_1p_http
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${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:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_1p_http,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_1p_http,
d052da24-bb9b-4e23-9a19-74172f96c9f3_1p_http,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_1p_http,
759b6820-1f15-49a2-88dc-5fdedc00222e_1p_http
result, different session:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_1p_http,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_1p_http,
d052da24-bb9b-4e23-9a19-74172f96c9f3_1p_http,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_1p_http,
759b6820-1f15-49a2-88dc-5fdedc00222e_1p_http
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, 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(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_1p_http,
fe70b923-a206-4127-a628-4604f6e6d1c3_1p_http,
0c3287cb-f64c-480d-93d8-96273ea64e19_1p_http,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_1p_http,
ed7e595a-d635-4336-968f-6a9b405276d0_1p_http
result, different session:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_1p_http,
fe70b923-a206-4127-a628-4604f6e6d1c3_1p_http,
0c3287cb-f64c-480d-93d8-96273ea64e19_1p_http,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_1p_http,
ed7e595a-d635-4336-968f-6a9b405276d0_1p_http
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${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:
a58e9ddb-d732-4545-90a3-d35ace999f4f_1p_http,
f1f7e315-bad6-4c05-85ee-ab121a223ebb_1p_http,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64_1p_http,
95d00574-70e7-43f2-8418-327685f9e1e3_1p_http,
701a5795-8be0-47ad-ae4d-47be3c533e13_1p_http
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, 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(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_1p_http,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_1p_http,
24f16af8-d55c-477a-b9a5-3684da77e4a9_1p_http,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_1p_http,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_1p_http
result, different session:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_1p_http,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_1p_http,
24f16af8-d55c-477a-b9a5-3684da77e4a9_1p_http,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_1p_http,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_1p_http
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${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:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_1p_http,
069cbeba-1a60-4873-8ac2-61702e957905_1p_http,
886f1482-9db2-419b-95c6-31e8d3dc6795_1p_http,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_1p_http,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_1p_http
result, different session:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_1p_http,
069cbeba-1a60-4873-8ac2-61702e957905_1p_http,
886f1482-9db2-419b-95c6-31e8d3dc6795_1p_http,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_1p_http,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_1p_http
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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.
Failed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_1p_js,
acc290ab-86e1-4a65-a011-a419f7d03e19_1p_js,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_1p_js,
b61e453f-87c4-4046-8412-86cc64f47f26_1p_js,
ab0e3118-dd5d-42c5-9360-1498d215c6db_1p_js
result, different session:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_1p_js,
acc290ab-86e1-4a65-a011-a419f7d03e19_1p_js,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_1p_js,
b61e453f-87c4-4046-8412-86cc64f47f26_1p_js,
ab0e3118-dd5d-42c5-9360-1498d215c6db_1p_js
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_1p_js,
2d8d4644-59cc-49ab-b560-db0182e57205_1p_js,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_1p_js,
c284751f-d3d5-4a49-90a7-1786cedf951a_1p_js,
b688a717-f384-445f-a01e-81d6729c1b16_1p_js
result, different session:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_1p_js,
2d8d4644-59cc-49ab-b560-db0182e57205_1p_js,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_1p_js,
c284751f-d3d5-4a49-90a7-1786cedf951a_1p_js,
b688a717-f384-445f-a01e-81d6729c1b16_1p_js
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
9f24c597-9428-48f7-82c0-54bef8109399_1p_js,
ab7ef486-4382-4e3c-9436-e81372b1791a_1p_js,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_1p_js,
689ce941-b964-4248-98af-2ca5a24e06fe_1p_js,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_1p_js
result, different session:
9f24c597-9428-48f7-82c0-54bef8109399_1p_js,
ab7ef486-4382-4e3c-9436-e81372b1791a_1p_js,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_1p_js,
689ce941-b964-4248-98af-2ca5a24e06fe_1p_js,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_1p_js
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_1p_js,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_1p_js,
d052da24-bb9b-4e23-9a19-74172f96c9f3_1p_js,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_1p_js,
759b6820-1f15-49a2-88dc-5fdedc00222e_1p_js
result, different session:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_1p_js,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_1p_js,
d052da24-bb9b-4e23-9a19-74172f96c9f3_1p_js,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_1p_js,
759b6820-1f15-49a2-88dc-5fdedc00222e_1p_js
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_1p_js,
fe70b923-a206-4127-a628-4604f6e6d1c3_1p_js,
0c3287cb-f64c-480d-93d8-96273ea64e19_1p_js,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_1p_js,
ed7e595a-d635-4336-968f-6a9b405276d0_1p_js
result, different session:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_1p_js,
fe70b923-a206-4127-a628-4604f6e6d1c3_1p_js,
0c3287cb-f64c-480d-93d8-96273ea64e19_1p_js,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_1p_js,
ed7e595a-d635-4336-968f-6a9b405276d0_1p_js
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Passed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
a58e9ddb-d732-4545-90a3-d35ace999f4f_1p_js,
f1f7e315-bad6-4c05-85ee-ab121a223ebb_1p_js,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64_1p_js,
95d00574-70e7-43f2-8418-327685f9e1e3_1p_js,
701a5795-8be0-47ad-ae4d-47be3c533e13_1p_js
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_1p_js,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_1p_js,
24f16af8-d55c-477a-b9a5-3684da77e4a9_1p_js,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_1p_js,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_1p_js
result, different session:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_1p_js,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_1p_js,
24f16af8-d55c-477a-b9a5-3684da77e4a9_1p_js,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_1p_js,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_1p_js
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => {
        document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_1p_js,
069cbeba-1a60-4873-8ac2-61702e957905_1p_js,
886f1482-9db2-419b-95c6-31e8d3dc6795_1p_js,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_1p_js,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_1p_js
result, different session:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_1p_js,
069cbeba-1a60-4873-8ac2-61702e957905_1p_js,
886f1482-9db2-419b-95c6-31e8d3dc6795_1p_js,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_1p_js,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_1p_js
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
CookieStore
The Cookie Store API is an alternative asynchronous API for managing cookies, supported by some browsers.
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:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_1p,
acc290ab-86e1-4a65-a011-a419f7d03e19_1p,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_1p,
b61e453f-87c4-4046-8412-86cc64f47f26_1p,
ab0e3118-dd5d-42c5-9360-1498d215c6db_1p
result, different session:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_1p,
acc290ab-86e1-4a65-a011-a419f7d03e19_1p,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_1p,
b61e453f-87c4-4046-8412-86cc64f47f26_1p,
ab0e3118-dd5d-42c5-9360-1498d215c6db_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, 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:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_1p,
2d8d4644-59cc-49ab-b560-db0182e57205_1p,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_1p,
c284751f-d3d5-4a49-90a7-1786cedf951a_1p,
b688a717-f384-445f-a01e-81d6729c1b16_1p
result, different session:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_1p,
2d8d4644-59cc-49ab-b560-db0182e57205_1p,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_1p,
c284751f-d3d5-4a49-90a7-1786cedf951a_1p,
b688a717-f384-445f-a01e-81d6729c1b16_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, 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:
9f24c597-9428-48f7-82c0-54bef8109399_1p,
ab7ef486-4382-4e3c-9436-e81372b1791a_1p,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_1p,
689ce941-b964-4248-98af-2ca5a24e06fe_1p,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_1p
result, different session:
9f24c597-9428-48f7-82c0-54bef8109399_1p,
ab7ef486-4382-4e3c-9436-e81372b1791a_1p,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_1p,
689ce941-b964-4248-98af-2ca5a24e06fe_1p,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, 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:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_1p,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_1p,
d052da24-bb9b-4e23-9a19-74172f96c9f3_1p,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_1p,
759b6820-1f15-49a2-88dc-5fdedc00222e_1p
result, different session:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_1p,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_1p,
d052da24-bb9b-4e23-9a19-74172f96c9f3_1p,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_1p,
759b6820-1f15-49a2-88dc-5fdedc00222e_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, 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:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_1p,
fe70b923-a206-4127-a628-4604f6e6d1c3_1p,
0c3287cb-f64c-480d-93d8-96273ea64e19_1p,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_1p,
ed7e595a-d635-4336-968f-6a9b405276d0_1p
result, different session:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_1p,
fe70b923-a206-4127-a628-4604f6e6d1c3_1p,
0c3287cb-f64c-480d-93d8-96273ea64e19_1p,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_1p,
ed7e595a-d635-4336-968f-6a9b405276d0_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:
a58e9ddb-d732-4545-90a3-d35ace999f4f_1p,
f1f7e315-bad6-4c05-85ee-ab121a223ebb_1p,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64_1p,
95d00574-70e7-43f2-8418-327685f9e1e3_1p,
701a5795-8be0-47ad-ae4d-47be3c533e13_1p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, 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:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_1p,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_1p,
24f16af8-d55c-477a-b9a5-3684da77e4a9_1p,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_1p,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_1p
result, different session:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_1p,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_1p,
24f16af8-d55c-477a-b9a5-3684da77e4a9_1p,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_1p,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, 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:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_1p,
069cbeba-1a60-4873-8ac2-61702e957905_1p,
886f1482-9db2-419b-95c6-31e8d3dc6795_1p,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_1p,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_1p
result, different session:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_1p,
069cbeba-1a60-4873-8ac2-61702e957905_1p,
886f1482-9db2-419b-95c6-31e8d3dc6795_1p,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_1p,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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.
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_7078645243197115,
fake_31247745765343304,
fake_2896447889067577,
fake_9101027924151659,
fake_613041679530522
result, different session:
fake_7078645243197115,
fake_31247745765343304,
fake_2896447889067577,
fake_9101027924151659,
fake_613041679530522
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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 session:
fake_017906655026360463,
fake_4571168010605957,
fake_570565107530201,
fake_6443523344359752,
fake_4979881321019761
result, different session:
fake_017906655026360463,
fake_4571168010605957,
fake_570565107530201,
fake_6443523344359752,
fake_4979881321019761
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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 session:
fake_7614779163363639,
fake_9812129716633473,
fake_9057270554343761,
fake_5421753415968018,
fake_409117809052818
result, different session:
fake_7614779163363639,
fake_9812129716633473,
fake_9057270554343761,
fake_5421753415968018,
fake_409117809052818
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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 session:
fake_8230389346279201,
fake_6340574879810947,
fake_32087022073564886,
fake_20222438955887378,
fake_13248315646325848
result, different session:
fake_8230389346279201,
fake_6340574879810947,
fake_32087022073564886,
fake_20222438955887378,
fake_13248315646325848
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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 session:
fake_6738653237181871,
fake_29021897011036035,
fake_9749958240566696,
fake_28233513933166066,
fake_8261626241248508
result, different session:
fake_6738653237181871,
fake_29021897011036035,
fake_9749958240566696,
fake_28233513933166066,
fake_8261626241248508
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_33589443901415583,
fake_5438178385764239,
fake_8714954190304296,
fake_9751084701308241,
fake_42690710219627803
result, different session:
fake_3016765620292374,
fake_8810095079910705,
fake_25159631623733136,
fake_421908934643044,
fake_7210909923334885
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 session:
fake_48495106623079365,
fake_16552876374830094,
fake_4765497192846768,
fake_2175449219060297,
fake_44056753076734867
result, different session:
fake_48495106623079365,
fake_16552876374830094,
fake_4765497192846768,
fake_2175449219060297,
fake_44056753076734867
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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 session:
fake_01320020430347113,
fake_4428177753485394,
fake_7767867381999751,
fake_9276286041645923,
fake_01976539800714283
result, different session:
fake_01320020430347113,
fake_4428177753485394,
fake_7767867381999751,
fake_9276286041645923,
fake_01976539800714283
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.
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
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
Unsupported
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:
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
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
Unsupported
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:
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
Unsupported
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:
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
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
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
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.
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
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
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
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
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: 2, 2, 2, 2, 2
result, different session: 3, 3, 3, 3, 3
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, 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
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
font cache
Web fonts are sometimes stored in their own cache, which is vulnerable to being abused for cross-site tracking.
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
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
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
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
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, 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
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
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
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.
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
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
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
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
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, 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
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
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
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.
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
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
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
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
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, 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
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
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
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.
Failed
write: async (secret) => {
        try {
          return await IdbKeyVal.set('secret', secret);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: () => IdbKeyVal.get('secret')
result, same session:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_1p,
acc290ab-86e1-4a65-a011-a419f7d03e19_1p,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_1p,
b61e453f-87c4-4046-8412-86cc64f47f26_1p,
ab0e3118-dd5d-42c5-9360-1498d215c6db_1p
result, different session:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_1p,
acc290ab-86e1-4a65-a011-a419f7d03e19_1p,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_1p,
b61e453f-87c4-4046-8412-86cc64f47f26_1p,
ab0e3118-dd5d-42c5-9360-1498d215c6db_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, 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:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_1p,
2d8d4644-59cc-49ab-b560-db0182e57205_1p,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_1p,
c284751f-d3d5-4a49-90a7-1786cedf951a_1p,
b688a717-f384-445f-a01e-81d6729c1b16_1p
result, different session:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_1p,
2d8d4644-59cc-49ab-b560-db0182e57205_1p,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_1p,
c284751f-d3d5-4a49-90a7-1786cedf951a_1p,
b688a717-f384-445f-a01e-81d6729c1b16_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, 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:
9f24c597-9428-48f7-82c0-54bef8109399_1p,
ab7ef486-4382-4e3c-9436-e81372b1791a_1p,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_1p,
689ce941-b964-4248-98af-2ca5a24e06fe_1p,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_1p
result, different session:
9f24c597-9428-48f7-82c0-54bef8109399_1p,
ab7ef486-4382-4e3c-9436-e81372b1791a_1p,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_1p,
689ce941-b964-4248-98af-2ca5a24e06fe_1p,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, 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:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_1p,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_1p,
d052da24-bb9b-4e23-9a19-74172f96c9f3_1p,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_1p,
759b6820-1f15-49a2-88dc-5fdedc00222e_1p
result, different session:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_1p,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_1p,
d052da24-bb9b-4e23-9a19-74172f96c9f3_1p,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_1p,
759b6820-1f15-49a2-88dc-5fdedc00222e_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, 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:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_1p,
fe70b923-a206-4127-a628-4604f6e6d1c3_1p,
0c3287cb-f64c-480d-93d8-96273ea64e19_1p,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_1p,
ed7e595a-d635-4336-968f-6a9b405276d0_1p
result, different session:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_1p,
fe70b923-a206-4127-a628-4604f6e6d1c3_1p,
0c3287cb-f64c-480d-93d8-96273ea64e19_1p,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_1p,
ed7e595a-d635-4336-968f-6a9b405276d0_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:
a58e9ddb-d732-4545-90a3-d35ace999f4f_1p,
f1f7e315-bad6-4c05-85ee-ab121a223ebb_1p,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64_1p,
95d00574-70e7-43f2-8418-327685f9e1e3_1p,
701a5795-8be0-47ad-ae4d-47be3c533e13_1p
result, different session: undefined
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, 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:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_1p,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_1p,
24f16af8-d55c-477a-b9a5-3684da77e4a9_1p,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_1p,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_1p
result, different session:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_1p,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_1p,
24f16af8-d55c-477a-b9a5-3684da77e4a9_1p,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_1p,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, 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:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_1p,
069cbeba-1a60-4873-8ac2-61702e957905_1p,
886f1482-9db2-419b-95c6-31e8d3dc6795_1p,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_1p,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_1p
result, different session:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_1p,
069cbeba-1a60-4873-8ac2-61702e957905_1p,
886f1482-9db2-419b-95c6-31e8d3dc6795_1p,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_1p,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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.
Failed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_1p,
acc290ab-86e1-4a65-a011-a419f7d03e19_1p,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_1p,
b61e453f-87c4-4046-8412-86cc64f47f26_1p,
ab0e3118-dd5d-42c5-9360-1498d215c6db_1p
result, different session:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_1p,
acc290ab-86e1-4a65-a011-a419f7d03e19_1p,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_1p,
b61e453f-87c4-4046-8412-86cc64f47f26_1p,
ab0e3118-dd5d-42c5-9360-1498d215c6db_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_1p,
2d8d4644-59cc-49ab-b560-db0182e57205_1p,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_1p,
c284751f-d3d5-4a49-90a7-1786cedf951a_1p,
b688a717-f384-445f-a01e-81d6729c1b16_1p
result, different session:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_1p,
2d8d4644-59cc-49ab-b560-db0182e57205_1p,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_1p,
c284751f-d3d5-4a49-90a7-1786cedf951a_1p,
b688a717-f384-445f-a01e-81d6729c1b16_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
9f24c597-9428-48f7-82c0-54bef8109399_1p,
ab7ef486-4382-4e3c-9436-e81372b1791a_1p,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_1p,
689ce941-b964-4248-98af-2ca5a24e06fe_1p,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_1p
result, different session:
9f24c597-9428-48f7-82c0-54bef8109399_1p,
ab7ef486-4382-4e3c-9436-e81372b1791a_1p,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_1p,
689ce941-b964-4248-98af-2ca5a24e06fe_1p,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_1p,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_1p,
d052da24-bb9b-4e23-9a19-74172f96c9f3_1p,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_1p,
759b6820-1f15-49a2-88dc-5fdedc00222e_1p
result, different session:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_1p,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_1p,
d052da24-bb9b-4e23-9a19-74172f96c9f3_1p,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_1p,
759b6820-1f15-49a2-88dc-5fdedc00222e_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_1p,
fe70b923-a206-4127-a628-4604f6e6d1c3_1p,
0c3287cb-f64c-480d-93d8-96273ea64e19_1p,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_1p,
ed7e595a-d635-4336-968f-6a9b405276d0_1p
result, different session:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_1p,
fe70b923-a206-4127-a628-4604f6e6d1c3_1p,
0c3287cb-f64c-480d-93d8-96273ea64e19_1p,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_1p,
ed7e595a-d635-4336-968f-6a9b405276d0_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:
a58e9ddb-d732-4545-90a3-d35ace999f4f_1p,
f1f7e315-bad6-4c05-85ee-ab121a223ebb_1p,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64_1p,
95d00574-70e7-43f2-8418-327685f9e1e3_1p,
701a5795-8be0-47ad-ae4d-47be3c533e13_1p
result, different session: , , , ,
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, false, false, false
Failed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_1p,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_1p,
24f16af8-d55c-477a-b9a5-3684da77e4a9_1p,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_1p,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_1p
result, different session:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_1p,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_1p,
24f16af8-d55c-477a-b9a5-3684da77e4a9_1p,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_1p,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: (secret) => { window.localStorage.setItem('secret', secret); }
read: () => window.localStorage.getItem('secret')
result, same session:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_1p,
069cbeba-1a60-4873-8ac2-61702e957905_1p,
886f1482-9db2-419b-95c6-31e8d3dc6795_1p,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_1p,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_1p
result, different session:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_1p,
069cbeba-1a60-4873-8ac2-61702e957905_1p,
886f1482-9db2-419b-95c6-31e8d3dc6795_1p,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_1p,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_1p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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.
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
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
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
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
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
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
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
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
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.
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
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
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
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
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, 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
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
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
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.
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
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
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
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
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, 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
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
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
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.
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
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
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
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
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
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
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
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
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.
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_3p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_3p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_3p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_3p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_3p
result, different session:
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_3p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_3p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_3p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_3p,
0b3fbdeb-137d-44c4-a93b-4ab8c9ae4f56_3p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${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:
3896d4ce-c55d-4bf1-ae02-9cee2145850c_3p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_3p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_3p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_3p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_3p
result, different session:
3896d4ce-c55d-4bf1-ae02-9cee2145850c_3p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_3p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_3p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_3p,
3896d4ce-c55d-4bf1-ae02-9cee2145850c_3p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
5f0f614c-43fc-420e-944b-4f0a0da990bf_3p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_3p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_3p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_3p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_3p
result, different session:
5f0f614c-43fc-420e-944b-4f0a0da990bf_3p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_3p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_3p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_3p,
5f0f614c-43fc-420e-944b-4f0a0da990bf_3p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${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:
c30feb74-0688-4e93-a1ee-945a342e2e51_3p,
c30feb74-0688-4e93-a1ee-945a342e2e51_3p,
c30feb74-0688-4e93-a1ee-945a342e2e51_3p,
c30feb74-0688-4e93-a1ee-945a342e2e51_3p,
c30feb74-0688-4e93-a1ee-945a342e2e51_3p
result, different session:
c30feb74-0688-4e93-a1ee-945a342e2e51_3p,
c30feb74-0688-4e93-a1ee-945a342e2e51_3p,
c30feb74-0688-4e93-a1ee-945a342e2e51_3p,
c30feb74-0688-4e93-a1ee-945a342e2e51_3p,
c30feb74-0688-4e93-a1ee-945a342e2e51_3p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
a3efc9cf-e003-4db6-b541-110fd75a7184_3p,
a3efc9cf-e003-4db6-b541-110fd75a7184_3p,
a3efc9cf-e003-4db6-b541-110fd75a7184_3p,
a3efc9cf-e003-4db6-b541-110fd75a7184_3p,
a3efc9cf-e003-4db6-b541-110fd75a7184_3p
result, different session:
a3efc9cf-e003-4db6-b541-110fd75a7184_3p,
a3efc9cf-e003-4db6-b541-110fd75a7184_3p,
a3efc9cf-e003-4db6-b541-110fd75a7184_3p,
a3efc9cf-e003-4db6-b541-110fd75a7184_3p,
a3efc9cf-e003-4db6-b541-110fd75a7184_3p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Unsupported
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${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: 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')
result, different session:
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: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${key}`]);
        } catch (e) {
          throw new Error('Unsupported');
        }
      }
read: async () => {
        const cache = await window.caches.open('supercookies');
        const cacheKeys = await cache.keys();
        const url = cacheKeys[0].url;
        return (new URL(url)).searchParams.get('key');
      }
result, same session:
4301548a-9fe6-46c1-bab3-6eca1e419c61_3p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_3p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_3p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_3p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_3p
result, different session:
4301548a-9fe6-46c1-bab3-6eca1e419c61_3p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_3p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_3p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_3p,
4301548a-9fe6-46c1-bab3-6eca1e419c61_3p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
test failed: false, false, false, false, false
Failed
write: async (key) => {
        try {
          const cache = await window.caches.open('supercookies');
          cache.addAll([`test.css?key=${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:
e2799d44-532c-43fe-aee3-305e020ebb55_3p,
e2799d44-532c-43fe-aee3-305e020ebb55_3p,
e2799d44-532c-43fe-aee3-305e020ebb55_3p,
e2799d44-532c-43fe-aee3-305e020ebb55_3p,
e2799d44-532c-43fe-aee3-305e020ebb55_3p
result, different session:
e2799d44-532c-43fe-aee3-305e020ebb55_3p,
e2799d44-532c-43fe-aee3-305e020ebb55_3p,
e2799d44-532c-43fe-aee3-305e020ebb55_3p,
e2799d44-532c-43fe-aee3-305e020ebb55_3p,
e2799d44-532c-43fe-aee3-305e020ebb55_3p
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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.
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(`${baseURI}headers`);
        const cookie = (await response.json()).cookie;
        return cookie ? cookie.match(/secret=([\w-]+)/)[1] : null;
      }
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
        await fetch(`${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
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.
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=${secret}_js; max-age=3600; SameSite=None; Secure`;
      }
read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null
result, same session: , , , ,
result, different session: , , , ,
unsupported: true, true, true, true, true
passed: undefined
test failed: false, false, false, false, false
Unsupported
write: (secret) => {
        document.cookie = `secret=${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
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.
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
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:
Error: Type error,
Error: Type error,
Error: Type error,
Error: Type error,
Error: Type error
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.
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_6368837825409912,
fake_8934422896715528,
fake_18494665079170458,
fake_2860340455275736,
fake_34155817520032783
result, different session:
fake_6368837825409912,
fake_8934422896715528,
fake_18494665079170458,
fake_2860340455275736,
fake_34155817520032783
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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 session:
fake_2532703772794669,
fake_9357573854762358,
fake_46577514367256145,
fake_7128817409239456,
fake_16280808665474966
result, different session:
fake_2532703772794669,
fake_9357573854762358,
fake_46577514367256145,
fake_7128817409239456,
fake_16280808665474966
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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 session:
fake_5722498469079442,
fake_32419996170462984,
fake_22299102043777008,
fake_932839022973079,
fake_45478669376071523
result, different session:
fake_5722498469079442,
fake_32419996170462984,
fake_22299102043777008,
fake_932839022973079,
fake_45478669376071523
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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 session:
fake_034368733522216255,
fake_9732098198211458,
fake_5175887465031916,
fake_5737773730156712,
fake_1383416361647427
result, different session:
fake_034368733522216255,
fake_9732098198211458,
fake_5175887465031916,
fake_5737773730156712,
fake_1383416361647427
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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 session:
fake_8669613427128708,
fake_3300043515624491,
fake_09095037648773996,
fake_5119203259327476,
fake_7982649064273268
result, different session:
fake_8669613427128708,
fake_3300043515624491,
fake_09095037648773996,
fake_5119203259327476,
fake_7982649064273268
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_6869896441905794,
fake_900884423832645,
fake_5532612400629329,
fake_48089128974045137,
fake_3298553300465752
result, different session:
fake_4500543517444713,
fake_8106560298370538,
fake_2518123475860745,
fake_24886521560054908,
fake_4963560431088092
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 session:
fake_30534896716732174,
fake_9048032633242191,
fake_5284497953685032,
fake_28287504117926354,
fake_4472655399779719
result, different session:
fake_30534896716732174,
fake_9048032633242191,
fake_5284497953685032,
fake_28287504117926354,
fake_4472655399779719
unsupported: false, false, false, false, false
passed: false, false, false, false, false
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 session:
fake_8541922376989233,
fake_4805586975545333,
fake_3407124230381584,
fake_7649213335936047,
fake_027489858174121418
result, different session:
fake_8541922376989233,
fake_4805586975545333,
fake_3407124230381584,
fake_7649213335936047,
fake_027489858174121418
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.
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
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
Unsupported
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:
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
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
Unsupported
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:
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
Unsupported
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:
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
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
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
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.
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
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
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
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
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: 2, 2, 2, 2, 2
result, different session: 3, 3, 3, 3, 3
unsupported: false, false, false, false, false
passed: true, true, true, true, true
test failed: false, false, 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
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
font cache
Web fonts are sometimes stored in their own cache, which is vulnerable to being abused for cross-site tracking.
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
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
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
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
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, 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
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
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
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.
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
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
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
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
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, 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
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
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
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.
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
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
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
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
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, 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
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
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
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:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_3p,
acc290ab-86e1-4a65-a011-a419f7d03e19_3p,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_3p,
b61e453f-87c4-4046-8412-86cc64f47f26_3p,
ab0e3118-dd5d-42c5-9360-1498d215c6db_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:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_3p,
2d8d4644-59cc-49ab-b560-db0182e57205_3p,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_3p,
c284751f-d3d5-4a49-90a7-1786cedf951a_3p,
b688a717-f384-445f-a01e-81d6729c1b16_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:
9f24c597-9428-48f7-82c0-54bef8109399_3p,
ab7ef486-4382-4e3c-9436-e81372b1791a_3p,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_3p,
689ce941-b964-4248-98af-2ca5a24e06fe_3p,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_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:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_3p,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_3p,
d052da24-bb9b-4e23-9a19-74172f96c9f3_3p,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_3p,
759b6820-1f15-49a2-88dc-5fdedc00222e_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:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_3p,
fe70b923-a206-4127-a628-4604f6e6d1c3_3p,
0c3287cb-f64c-480d-93d8-96273ea64e19_3p,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_3p,
ed7e595a-d635-4336-968f-6a9b405276d0_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:
a58e9ddb-d732-4545-90a3-d35ace999f4f_3p,
f1f7e315-bad6-4c05-85ee-ab121a223ebb_3p,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64_3p,
95d00574-70e7-43f2-8418-327685f9e1e3_3p,
701a5795-8be0-47ad-ae4d-47be3c533e13_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:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_3p,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_3p,
24f16af8-d55c-477a-b9a5-3684da77e4a9_3p,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_3p,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_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:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_3p,
069cbeba-1a60-4873-8ac2-61702e957905_3p,
886f1482-9db2-419b-95c6-31e8d3dc6795_3p,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_3p,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_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:
b5b6f8b5-a16c-4a4d-b4ec-004ea97797d5_3p,
acc290ab-86e1-4a65-a011-a419f7d03e19_3p,
bb09f7dd-321e-44c0-acf2-035c497a8cf1_3p,
b61e453f-87c4-4046-8412-86cc64f47f26_3p,
ab0e3118-dd5d-42c5-9360-1498d215c6db_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:
3cd048f1-6d76-4501-ae18-a282f31e1a9b_3p,
2d8d4644-59cc-49ab-b560-db0182e57205_3p,
2f9f24ff-a8b2-4a2f-b508-2ac351011514_3p,
c284751f-d3d5-4a49-90a7-1786cedf951a_3p,
b688a717-f384-445f-a01e-81d6729c1b16_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:
9f24c597-9428-48f7-82c0-54bef8109399_3p,
ab7ef486-4382-4e3c-9436-e81372b1791a_3p,
8eb02738-3cdc-46a0-8d64-d2b08f0f0355_3p,
689ce941-b964-4248-98af-2ca5a24e06fe_3p,
f878fb83-b1dd-49b2-bd6e-2115809eaf4e_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:
7bbb3c9d-751e-4faf-8688-c7ea3ba2bb1c_3p,
4f2fbebf-113b-4615-a05f-36b43c2f43f3_3p,
d052da24-bb9b-4e23-9a19-74172f96c9f3_3p,
bac9b718-8a5f-4a5c-920f-ca26a2eae38e_3p,
759b6820-1f15-49a2-88dc-5fdedc00222e_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:
eeb01fa8-ffd5-462c-aae7-51ded204c3d0_3p,
fe70b923-a206-4127-a628-4604f6e6d1c3_3p,
0c3287cb-f64c-480d-93d8-96273ea64e19_3p,
beaeefb7-187f-4cc4-89e7-3dd14de2aa5a_3p,
ed7e595a-d635-4336-968f-6a9b405276d0_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:
a58e9ddb-d732-4545-90a3-d35ace999f4f_3p,
f1f7e315-bad6-4c05-85ee-ab121a223ebb_3p,
9e7f96f7-8e43-4692-a68e-6e7c4b84bf64_3p,
95d00574-70e7-43f2-8418-327685f9e1e3_3p,
701a5795-8be0-47ad-ae4d-47be3c533e13_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:
81c7bbbe-cae5-449c-8360-ca12f40eb74e_3p,
0d523e04-9b00-4dd9-8f9b-307a98482fb2_3p,
24f16af8-d55c-477a-b9a5-3684da77e4a9_3p,
792a94b6-513d-4d69-90dc-d0f5883bdaa1_3p,
f527fe34-7eaa-4b3e-92f7-aa48d3a5f73d_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:
6ce96ad2-b2d2-41e4-a6e2-699bbaf3d009_3p,
069cbeba-1a60-4873-8ac2-61702e957905_3p,
886f1482-9db2-419b-95c6-31e8d3dc6795_3p,
c70cb40d-8c55-4e3b-ae79-10fbdf6a7da5_3p,
5eaf40aa-32b5-42c7-b95d-0b1fa780b33a_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.
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
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
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
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
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
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
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
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
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.
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
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
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
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
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, 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
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
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
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.
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
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
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
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
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, 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
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
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