Android Browsers

(default settings)
brave logo
brave
1.61
chrome logo
chrome
120.0
duckduckgo logo
duckduckgo
5.183
edge logo
edge
120.0
firefox logo
firefox
121.1
focus logo
focus
121.1
mull logo
mull
121.0
opera logo
opera
79.5
samsung logo
samsung
23.0
tor logo
tor
115.2
vivaldi logo
vivaldi
6.5
yandex logo
yandex
23.11
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(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same first party: h3, h3, h3, h3, h3

result, different first party: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
      let responseText = "";
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/clear");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after clear:", responseText);
      // Store "h3" state in Alt-Svc cache
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/set");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after set:", responseText);
    }

read: async () => {
      const protocol = await fetchText(altSvcOrigin + "/protocol");
      if ((new URL(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same first party: h3, h3, h3, h3, h3

result, different first party: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
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(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same first party: h3, h3, h3, h3, h3

result, different first party: h3, h3, h3, h3, h3

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same first party: h3, h3, h3, h3, h3

result, different first party: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
      let responseText = "";
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/clear");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after clear:", responseText);
      // Store "h3" state in Alt-Svc cache
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/set");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after set:", responseText);
    }

read: async () => {
      const protocol = await fetchText(altSvcOrigin + "/protocol");
      if ((new URL(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same first party: h3, h3, h3, h3, h3

result, different first party: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
      let responseText = "";
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/clear");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after clear:", responseText);
      // Store "h3" state in Alt-Svc cache
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/set");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after set:", responseText);
    }

read: async () => {
      const protocol = await fetchText(altSvcOrigin + "/protocol");
      if ((new URL(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same first party: h3, h3, h3, h3, h3

result, different first party: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
      let responseText = "";
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/clear");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after clear:", responseText);
      // Store "h3" state in Alt-Svc cache
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/set");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after set:", responseText);
    }

read: async () => {
      const protocol = await fetchText(altSvcOrigin + "/protocol");
      if ((new URL(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same first party: h3, h3, h3, h3

result, different first party: h2, h2, h2, h2

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
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(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same first party: h3, h3, h3, h3, h3

result, different first party: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Unsupported
write: async () => {
      // Clear Alt-Svc caching first.
      let responseText = "";
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/clear");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after clear:", responseText);
      // Store "h3" state in Alt-Svc cache
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/set");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after set:", responseText);
    }

read: async () => {
      const protocol = await fetchText(altSvcOrigin + "/protocol");
      if ((new URL(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
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(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same first party: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

result, different first party: h2, h2, h2

unsupported: true, true, true

passed: undefined

test failed: false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
      let responseText = "";
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/clear");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after clear:", responseText);
      // Store "h3" state in Alt-Svc cache
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/set");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after set:", responseText);
    }

read: async () => {
      const protocol = await fetchText(altSvcOrigin + "/protocol");
      if ((new URL(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same first party: h3, h3, h3, h3, h3

result, different first party: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
      let responseText = "";
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/clear");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after clear:", responseText);
      // Store "h3" state in Alt-Svc cache
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/set");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after set:", responseText);
    }

read: async () => {
      const protocol = await fetchText(altSvcOrigin + "/protocol");
      if ((new URL(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same first party: h3, h3, h3, h3, h3

result, different first party: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
blob
A 'blob URL' is a local reference to some raw data. Trackers can use a blob URL to share data between websites.
              
Passed
write: (secret) => {
      try {
        let 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) => {
      let response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
      let result = await response.json();
      let blobUrl = decodeURIComponent(result.blobUrl);
      let blobResponse = await fetch(blobUrl);
      return blobResponse.text();
    }

result, same first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

result, different first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: (secret) => {
      try {
        let 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) => {
      let response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
      let result = await response.json();
      let blobUrl = decodeURIComponent(result.blobUrl);
      let blobResponse = await fetch(blobUrl);
      return blobResponse.text();
    }

result, same first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

result, different first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: (secret) => {
      try {
        let 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) => {
      let response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
      let result = await response.json();
      let blobUrl = decodeURIComponent(result.blobUrl);
      let blobResponse = await fetch(blobUrl);
      return blobResponse.text();
    }

result, same first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

result, different first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: (secret) => {
      try {
        let 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) => {
      let response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
      let result = await response.json();
      let blobUrl = decodeURIComponent(result.blobUrl);
      let blobResponse = await fetch(blobUrl);
      return blobResponse.text();
    }

result, same first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

result, different first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: (secret) => {
      try {
        let 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) => {
      let response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
      let result = await response.json();
      let blobUrl = decodeURIComponent(result.blobUrl);
      let blobResponse = await fetch(blobUrl);
      return blobResponse.text();
    }

result, same first party: 
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.

result, different first party: 
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: (secret) => {
      try {
        let 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) => {
      let response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
      let result = await response.json();
      let blobUrl = decodeURIComponent(result.blobUrl);
      let blobResponse = await fetch(blobUrl);
      return blobResponse.text();
    }

result, same first party: 
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.

result, different first party: 
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: (secret) => {
      try {
        let 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) => {
      let response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
      let result = await response.json();
      let blobUrl = decodeURIComponent(result.blobUrl);
      let blobResponse = await fetch(blobUrl);
      return blobResponse.text();
    }

result, same first party: 
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.

result, different first party: 
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.

unsupported: false, false, false, false

passed: undefined

test failed: true, true, true, true
Passed
write: (secret) => {
      try {
        let 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) => {
      let response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
      let result = await response.json();
      let blobUrl = decodeURIComponent(result.blobUrl);
      let blobResponse = await fetch(blobUrl);
      return blobResponse.text();
    }

result, same first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

result, different first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: (secret) => {
      try {
        let 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) => {
      let response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
      let result = await response.json();
      let blobUrl = decodeURIComponent(result.blobUrl);
      let blobResponse = await fetch(blobUrl);
      return blobResponse.text();
    }

result, same first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

result, different first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: (secret) => {
      try {
        let 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) => {
      let response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
      let result = await response.json();
      let blobUrl = decodeURIComponent(result.blobUrl);
      let blobResponse = await fetch(blobUrl);
      return blobResponse.text();
    }

result, same first party: 
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.

result, different first party: 
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.,
Error: NetworkError when attempting to fetch resource.

unsupported: false, false, false

passed: undefined

test failed: true, true, true
Passed
write: (secret) => {
      try {
        let 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) => {
      let response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
      let result = await response.json();
      let blobUrl = decodeURIComponent(result.blobUrl);
      let blobResponse = await fetch(blobUrl);
      return blobResponse.text();
    }

result, same first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

result, different first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: (secret) => {
      try {
        let 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) => {
      let response = await fetch(`${baseURI}blob?mode=read&key=${secret}`);
      let result = await response.json();
      let blobUrl = decodeURIComponent(result.blobUrl);
      let blobResponse = await fetch(blobUrl);
      return blobResponse.text();
    }

result, same first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

result, different first party: 
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch,
Error: Failed to fetch

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
BroadcastChannel
A BroadcastChannel is designed to send messages between tabs. In some browsers it can be used for cross-site communication and tracking.
              
Passed
write: (secret) => {
      try {
        let 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) => {
        let bc = new BroadcastChannel("secrets");
        bc.onmessage = (event) => {
          if (event.data !== "request") {
            resolve(event.data);
          }
        };
        bc.postMessage("request");
        setTimeout(() => reject({message: "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 {
        let 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) => {
        let bc = new BroadcastChannel("secrets");
        bc.onmessage = (event) => {
          if (event.data !== "request") {
            resolve(event.data);
          }
        };
        bc.postMessage("request");
        setTimeout(() => reject({message: "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 {
        let 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) => {
        let bc = new BroadcastChannel("secrets");
        bc.onmessage = (event) => {
          if (event.data !== "request") {
            resolve(event.data);
          }
        };
        bc.postMessage("request");
        setTimeout(() => reject({message: "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 {
        let 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) => {
        let bc = new BroadcastChannel("secrets");
        bc.onmessage = (event) => {
          if (event.data !== "request") {
            resolve(event.data);
          }
        };
        bc.postMessage("request");
        setTimeout(() => reject({message: "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 {
        let 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) => {
        let bc = new BroadcastChannel("secrets");
        bc.onmessage = (event) => {
          if (event.data !== "request") {
            resolve(event.data);
          }
        };
        bc.postMessage("request");
        setTimeout(() => reject({message: "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 {
        let 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) => {
        let bc = new BroadcastChannel("secrets");
        bc.onmessage = (event) => {
          if (event.data !== "request") {
            resolve(event.data);
          }
        };
        bc.postMessage("request");
        setTimeout(() => reject({message: "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 {
        let 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) => {
        let bc = new BroadcastChannel("secrets");
        bc.onmessage = (event) => {
          if (event.data !== "request") {
            resolve(event.data);
          }
        };
        bc.postMessage("request");
        setTimeout(() => reject({message: "no BroadcastChannel message"}), 3000);
      })

result, same first party: 
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

unsupported: false, false, false, false

passed: undefined

test failed: true, true, true, true
Passed
write: (secret) => {
      try {
        let 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) => {
        let bc = new BroadcastChannel("secrets");
        bc.onmessage = (event) => {
          if (event.data !== "request") {
            resolve(event.data);
          }
        };
        bc.postMessage("request");
        setTimeout(() => reject({message: "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 {
        let 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) => {
        let bc = new BroadcastChannel("secrets");
        bc.onmessage = (event) => {
          if (event.data !== "request") {
            resolve(event.data);
          }
        };
        bc.postMessage("request");
        setTimeout(() => reject({message: "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 {
        let 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) => {
        let bc = new BroadcastChannel("secrets");
        bc.onmessage = (event) => {
          if (event.data !== "request") {
            resolve(event.data);
          }
        };
        bc.postMessage("request");
        setTimeout(() => reject({message: "no BroadcastChannel message"}), 3000);
      })

result, same first party: 
Error: no BroadcastChannel message,
Error: no BroadcastChannel message,
Error: no BroadcastChannel message

result, different first party: 
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.

unsupported: false, false, false

passed: undefined

test failed: true, true, true
Passed
write: (secret) => {
      try {
        let 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) => {
        let bc = new BroadcastChannel("secrets");
        bc.onmessage = (event) => {
          if (event.data !== "request") {
            resolve(event.data);
          }
        };
        bc.postMessage("request");
        setTimeout(() => reject({message: "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 {
        let 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) => {
        let bc = new BroadcastChannel("secrets");
        bc.onmessage = (event) => {
          if (event.data !== "request") {
            resolve(event.data);
          }
        };
        bc.postMessage("request");
        setTimeout(() => reject({message: "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 {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same first party: 
143d61f8-2894-4529-ad80-0a53e9ebc6cc,
143d61f8-2894-4529-ad80-0a53e9ebc6cc,
143d61f8-2894-4529-ad80-0a53e9ebc6cc,
143d61f8-2894-4529-ad80-0a53e9ebc6cc,
143d61f8-2894-4529-ad80-0a53e9ebc6cc

result, different first party: 
Error: Failed to execute 'open' on 'CacheStorage': An attempt was made to break through the security policy of the user agent.,
Error: Failed to execute 'open' on 'CacheStorage': An attempt was made to break through the security policy of the user agent.,
Error: Failed to execute 'open' on 'CacheStorage': An attempt was made to break through the security policy of the user agent.,
Error: Failed to execute 'open' on 'CacheStorage': An attempt was made to break through the security policy of the user agent.,
Error: Failed to execute 'open' on 'CacheStorage': An attempt was made to break through the security policy of the user agent.

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same first party: 
c745bf91-cf98-4e5f-8375-d1de83cf19d5,
c745bf91-cf98-4e5f-8375-d1de83cf19d5,
c745bf91-cf98-4e5f-8375-d1de83cf19d5,
c745bf91-cf98-4e5f-8375-d1de83cf19d5,
c745bf91-cf98-4e5f-8375-d1de83cf19d5

result, different first party: 
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same first party: 
1a5b5a6f-5aeb-49ba-8577-c852ce8b48e5_3p,
1a5b5a6f-5aeb-49ba-8577-c852ce8b48e5_3p,
1a5b5a6f-5aeb-49ba-8577-c852ce8b48e5_3p,
1a5b5a6f-5aeb-49ba-8577-c852ce8b48e5_3p,
1a5b5a6f-5aeb-49ba-8577-c852ce8b48e5_3p

result, different first party: 
1a5b5a6f-5aeb-49ba-8577-c852ce8b48e5_3p,
1a5b5a6f-5aeb-49ba-8577-c852ce8b48e5_3p,
1a5b5a6f-5aeb-49ba-8577-c852ce8b48e5_3p,
1a5b5a6f-5aeb-49ba-8577-c852ce8b48e5_3p,
1a5b5a6f-5aeb-49ba-8577-c852ce8b48e5_3p

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same first party: 
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0,
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0,
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0,
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0,
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0

result, different first party: 
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same first party: 
39122539-ac2b-4685-b7fc-0e032c9e090b,
39122539-ac2b-4685-b7fc-0e032c9e090b,
39122539-ac2b-4685-b7fc-0e032c9e090b,
39122539-ac2b-4685-b7fc-0e032c9e090b,
39122539-ac2b-4685-b7fc-0e032c9e090b

result, different first party: 
Error: cacheKeys[0] is undefined,
Error: cacheKeys[0] is undefined,
Error: cacheKeys[0] is undefined,
Error: cacheKeys[0] is undefined,
Error: cacheKeys[0] is undefined

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Unsupported
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same first party: 
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.

result, different first party: 
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.

unsupported: true, true, true, true, true

passed: undefined

test failed: false, false, false, false, false
Passed
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same first party: 
ec60fada-f7df-4f1e-b11a-25a5811cf11f,
ec60fada-f7df-4f1e-b11a-25a5811cf11f,
ec60fada-f7df-4f1e-b11a-25a5811cf11f,
ec60fada-f7df-4f1e-b11a-25a5811cf11f

result, different first party: 
Error: cacheKeys[0] is undefined,
Error: cacheKeys[0] is undefined,
Error: cacheKeys[0] is undefined,
Error: cacheKeys[0] is undefined

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same first party: 
c97b5d06-2396-4bb1-9f7d-6fde65072b04,
c97b5d06-2396-4bb1-9f7d-6fde65072b04,
c97b5d06-2396-4bb1-9f7d-6fde65072b04,
c97b5d06-2396-4bb1-9f7d-6fde65072b04,
c97b5d06-2396-4bb1-9f7d-6fde65072b04

result, different first party: 
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same first party: 
a31f089a-366d-46aa-8a3d-39c59eae3ef3_3p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_3p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_3p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_3p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_3p

result, different first party: 
a31f089a-366d-46aa-8a3d-39c59eae3ef3_3p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_3p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_3p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_3p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_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 {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same first party: 
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.

result, different first party: 
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.

unsupported: true, true, true

passed: undefined

test failed: false, false, false
Passed
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same first party: 
1af58a1e-55c5-4125-ba6b-5729d21fd23c,
1af58a1e-55c5-4125-ba6b-5729d21fd23c,
1af58a1e-55c5-4125-ba6b-5729d21fd23c,
1af58a1e-55c5-4125-ba6b-5729d21fd23c,
1af58a1e-55c5-4125-ba6b-5729d21fd23c

result, different first party: 
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url'),
Error: Cannot read properties of undefined (reading 'url')

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same first party: 
4f69eb13-b603-4269-81bb-78ce896b6e33_3p,
4f69eb13-b603-4269-81bb-78ce896b6e33_3p,
4f69eb13-b603-4269-81bb-78ce896b6e33_3p,
4f69eb13-b603-4269-81bb-78ce896b6e33_3p,
4f69eb13-b603-4269-81bb-78ce896b6e33_3p

result, different first party: 
4f69eb13-b603-4269-81bb-78ce896b6e33_3p,
4f69eb13-b603-4269-81bb-78ce896b6e33_3p,
4f69eb13-b603-4269-81bb-78ce896b6e33_3p,
4f69eb13-b603-4269-81bb-78ce896b6e33_3p,
4f69eb13-b603-4269-81bb-78ce896b6e33_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.
              
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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same first party: 
7458e015-b20f-4696-982b-aff57b0a74d4_http,
233e87ca-b8aa-436e-b680-817d86c6acc6_http,
93c14173-842d-44ed-a4ff-63e04b54c399_http,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058_http,
0fffef3e-f7ec-4b63-96e1-3579877405b9_http

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: 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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same first party: 
a532c74b-ccca-4515-a333-acc0a246685e_http,
101607a1-97bb-463f-a9d1-90092abd8d32_http,
8db0833d-7b52-46e6-b332-55ab54a0a865_http,
a349e1c6-758d-4877-aabd-0c7631135118_http,
d64967c1-e520-4790-8fb7-45ad567e909b_http

result, different first party: 
a532c74b-ccca-4515-a333-acc0a246685e_http,
101607a1-97bb-463f-a9d1-90092abd8d32_http,
8db0833d-7b52-46e6-b332-55ab54a0a865_http,
a349e1c6-758d-4877-aabd-0c7631135118_http,
d64967c1-e520-4790-8fb7-45ad567e909b_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b_http,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2_http,
03b9d753-12c6-4473-b06d-b8373a015a62_http,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f_http,
04fae689-670b-4d64-9966-eb064fc485e2_http

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: 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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same first party: 
e8304637-cd9b-4058-bcea-626aab9e6c48_http,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b_http,
358302cc-de3c-4795-9b0b-887befc03092_http,
4baa56df-63a7-4df0-ae5c-40889f396f9b_http,
e1def859-9956-483d-a3e7-968b58011edd_http

result, different first party: 
e8304637-cd9b-4058-bcea-626aab9e6c48_http,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b_http,
358302cc-de3c-4795-9b0b-887befc03092_http,
4baa56df-63a7-4df0-ae5c-40889f396f9b_http,
e1def859-9956-483d-a3e7-968b58011edd_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same first party: 
1493eeef-c081-44cb-8d2a-f4ab9af6a92e_http,
16ced892-e431-42ab-9017-da51b0a252c4_http,
b123e636-13a4-400d-9ee2-2c169a0139aa_http,
c697e0c1-9995-42a9-ba16-79646dbb7080_http,
5bf95fd8-3c2f-45c7-8f72-f3d86b122801_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same first party: 
9c2e169f-8427-4aef-a5d9-aae49dd17a75_http,
93048464-dce7-4a11-bd17-e6d2a9f351ae_http,
a0218bc8-aa46-4824-814a-e196a157d9ba_http,
8bb72ef9-2ce9-4c9b-8cc4-3ada65a3c885_http,
7dcd2a99-0b83-48d4-8de2-36ea2e2e15fa_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same first party: 
c0c1c677-f40a-4384-a88c-e68592da8028_http,
8611fa70-4e3c-419c-bf1c-14efadf3bf65_http,
c9d39f37-3482-42a2-8c78-eae8ac064794_http,
dfcafb86-c9a6-4426-adf1-7e4f52e6c84e_http

result, different first party: , , , 

unsupported: false, false, false, false

passed: true, true, true, true

test failed: 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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same first party: 
14e75fa4-a0d5-4431-9cba-1a4091496414_http,
d2c62f48-b023-4b69-9342-2c559c33e3e1_http,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71_http,
ab020566-d8a9-41af-aec5-58a457f3429a_http,
7d693c08-ae49-4855-88a9-ca684c95c567_http

result, different first party: 
14e75fa4-a0d5-4431-9cba-1a4091496414_http,
d2c62f48-b023-4b69-9342-2c559c33e3e1_http,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71_http,
ab020566-d8a9-41af-aec5-58a457f3429a_http,
7d693c08-ae49-4855-88a9-ca684c95c567_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476_http,
eb0669e8-a477-4269-b334-0f6368e23739_http,
309203c0-e03c-48c7-8048-dff552ec9f26_http,
e390a75c-c1da-4107-b6ea-2796a43ee590_http,
2274f6cd-be7d-4901-8463-5dbcfd05cce5_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same first party: 
05da0cf3-c3f1-456e-9131-51fd4bb8933d_http,
e12f334e-76b0-4ebc-aa46-96e6aa14c022_http,
39960fb8-e89f-4bf8-99a2-136a8909aa1c_http

result, different first party: , , 

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Failed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
      await fetch(`${baseURI}cookie?secret=${secret}_http`);
    }

read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same first party: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c_http,
1407c508-f609-441d-9532-18e2ab87cff2_http,
983896b9-fb6d-4759-a274-c1e36cfa3a67_http,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb_http,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7_http

result, different first party: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c_http,
1407c508-f609-441d-9532-18e2ab87cff2_http,
983896b9-fb6d-4759-a274-c1e36cfa3a67_http,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb_http,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same first party: 
55443143-31e2-4079-87ff-2d3d1f51065a_http,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5_http,
736e1b37-65cf-48c4-82c4-eec3a005803b_http,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda_http,
2983da41-73b8-41fc-a719-30cc15f4f8f7_http

result, different first party: 
55443143-31e2-4079-87ff-2d3d1f51065a_http,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5_http,
736e1b37-65cf-48c4-82c4-eec3a005803b_http,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda_http,
2983da41-73b8-41fc-a719-30cc15f4f8f7_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.
              
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: 
7458e015-b20f-4696-982b-aff57b0a74d4_js,
233e87ca-b8aa-436e-b680-817d86c6acc6_js,
93c14173-842d-44ed-a4ff-63e04b54c399_js,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058_js,
0fffef3e-f7ec-4b63-96e1-3579877405b9_js

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (secret) => {
      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: 
a532c74b-ccca-4515-a333-acc0a246685e_js,
101607a1-97bb-463f-a9d1-90092abd8d32_js,
8db0833d-7b52-46e6-b332-55ab54a0a865_js,
a349e1c6-758d-4877-aabd-0c7631135118_js,
d64967c1-e520-4790-8fb7-45ad567e909b_js

result, different first party: 
a532c74b-ccca-4515-a333-acc0a246685e_js,
101607a1-97bb-463f-a9d1-90092abd8d32_js,
8db0833d-7b52-46e6-b332-55ab54a0a865_js,
a349e1c6-758d-4877-aabd-0c7631135118_js,
d64967c1-e520-4790-8fb7-45ad567e909b_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 first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b_js,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2_js,
03b9d753-12c6-4473-b06d-b8373a015a62_js,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f_js,
04fae689-670b-4d64-9966-eb064fc485e2_js

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (secret) => {
      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: 
e8304637-cd9b-4058-bcea-626aab9e6c48_js,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b_js,
358302cc-de3c-4795-9b0b-887befc03092_js,
4baa56df-63a7-4df0-ae5c-40889f396f9b_js,
e1def859-9956-483d-a3e7-968b58011edd_js

result, different first party: 
e8304637-cd9b-4058-bcea-626aab9e6c48_js,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b_js,
358302cc-de3c-4795-9b0b-887befc03092_js,
4baa56df-63a7-4df0-ae5c-40889f396f9b_js,
e1def859-9956-483d-a3e7-968b58011edd_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 first party: 
1493eeef-c081-44cb-8d2a-f4ab9af6a92e_js,
16ced892-e431-42ab-9017-da51b0a252c4_js,
b123e636-13a4-400d-9ee2-2c169a0139aa_js,
c697e0c1-9995-42a9-ba16-79646dbb7080_js,
5bf95fd8-3c2f-45c7-8f72-f3d86b122801_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: 
9c2e169f-8427-4aef-a5d9-aae49dd17a75_js,
93048464-dce7-4a11-bd17-e6d2a9f351ae_js,
a0218bc8-aa46-4824-814a-e196a157d9ba_js,
8bb72ef9-2ce9-4c9b-8cc4-3ada65a3c885_js,
7dcd2a99-0b83-48d4-8de2-36ea2e2e15fa_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: 
c0c1c677-f40a-4384-a88c-e68592da8028_js,
8611fa70-4e3c-419c-bf1c-14efadf3bf65_js,
c9d39f37-3482-42a2-8c78-eae8ac064794_js,
dfcafb86-c9a6-4426-adf1-7e4f52e6c84e_js

result, different first party: , , , 

unsupported: false, false, false, false

passed: true, true, true, true

test failed: 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 first party: 
14e75fa4-a0d5-4431-9cba-1a4091496414_js,
d2c62f48-b023-4b69-9342-2c559c33e3e1_js,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71_js,
ab020566-d8a9-41af-aec5-58a457f3429a_js,
7d693c08-ae49-4855-88a9-ca684c95c567_js

result, different first party: 
14e75fa4-a0d5-4431-9cba-1a4091496414_js,
d2c62f48-b023-4b69-9342-2c559c33e3e1_js,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71_js,
ab020566-d8a9-41af-aec5-58a457f3429a_js,
7d693c08-ae49-4855-88a9-ca684c95c567_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 first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476_js,
eb0669e8-a477-4269-b334-0f6368e23739_js,
309203c0-e03c-48c7-8048-dff552ec9f26_js,
e390a75c-c1da-4107-b6ea-2796a43ee590_js,
2274f6cd-be7d-4901-8463-5dbcfd05cce5_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: 
05da0cf3-c3f1-456e-9131-51fd4bb8933d_js,
e12f334e-76b0-4ebc-aa46-96e6aa14c022_js,
39960fb8-e89f-4bf8-99a2-136a8909aa1c_js

result, different first party: , , 

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Failed
write: (secret) => {
      document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
    }

read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null

result, same first party: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c_js,
1407c508-f609-441d-9532-18e2ab87cff2_js,
983896b9-fb6d-4759-a274-c1e36cfa3a67_js,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb_js,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7_js

result, different first party: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c_js,
1407c508-f609-441d-9532-18e2ab87cff2_js,
983896b9-fb6d-4759-a274-c1e36cfa3a67_js,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb_js,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7_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 first party: 
55443143-31e2-4079-87ff-2d3d1f51065a_js,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5_js,
736e1b37-65cf-48c4-82c4-eec3a005803b_js,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda_js,
2983da41-73b8-41fc-a719-30cc15f4f8f7_js

result, different first party: 
55443143-31e2-4079-87ff-2d3d1f51065a_js,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5_js,
736e1b37-65cf-48c4-82c4-eec3a005803b_js,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda_js,
2983da41-73b8-41fc-a719-30cc15f4f8f7_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.
              
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: 
7458e015-b20f-4696-982b-aff57b0a74d4,
233e87ca-b8aa-436e-b680-817d86c6acc6,
93c14173-842d-44ed-a4ff-63e04b54c399,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058,
0fffef3e-f7ec-4b63-96e1-3579877405b9

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (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: 
a532c74b-ccca-4515-a333-acc0a246685e,
101607a1-97bb-463f-a9d1-90092abd8d32,
8db0833d-7b52-46e6-b332-55ab54a0a865,
a349e1c6-758d-4877-aabd-0c7631135118,
d64967c1-e520-4790-8fb7-45ad567e909b

result, different first party: 
a532c74b-ccca-4515-a333-acc0a246685e,
101607a1-97bb-463f-a9d1-90092abd8d32,
8db0833d-7b52-46e6-b332-55ab54a0a865,
a349e1c6-758d-4877-aabd-0c7631135118,
d64967c1-e520-4790-8fb7-45ad567e909b

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 first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
03b9d753-12c6-4473-b06d-b8373a015a62,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
04fae689-670b-4d64-9966-eb064fc485e2

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (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: 
e8304637-cd9b-4058-bcea-626aab9e6c48,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b,
358302cc-de3c-4795-9b0b-887befc03092,
4baa56df-63a7-4df0-ae5c-40889f396f9b,
e1def859-9956-483d-a3e7-968b58011edd

result, different first party: 
e8304637-cd9b-4058-bcea-626aab9e6c48,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b,
358302cc-de3c-4795-9b0b-887befc03092,
4baa56df-63a7-4df0-ae5c-40889f396f9b,
e1def859-9956-483d-a3e7-968b58011edd

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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 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
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 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
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 first party: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

result, different first party: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

unsupported: true, true, true, true

passed: undefined

test failed: 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 first party: 
14e75fa4-a0d5-4431-9cba-1a4091496414,
d2c62f48-b023-4b69-9342-2c559c33e3e1,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71,
ab020566-d8a9-41af-aec5-58a457f3429a,
7d693c08-ae49-4855-88a9-ca684c95c567

result, different first party: 
14e75fa4-a0d5-4431-9cba-1a4091496414,
d2c62f48-b023-4b69-9342-2c559c33e3e1,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71,
ab020566-d8a9-41af-aec5-58a457f3429a,
7d693c08-ae49-4855-88a9-ca684c95c567

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 first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

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: (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: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

result, different first party: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

unsupported: true, true, true

passed: undefined

test failed: false, false, false
Failed
write: (data) => {
      const msPerHour = 60 * 60 * 1000;
      if (!window.cookieStore) {
        throw new Error("Unsupported");
      }
      window.cookieStore.set({
        name: "partition_test",
        value: data,
        expires: Date.now() + msPerHour,
        sameSite: "none"
      });
    }

read: async () => {
      if (!window.cookieStore) {
        throw new Error("Unsupported");
      }
      const cookie = await window.cookieStore.get("partition_test");
      if (!cookie) {
        return null;
      }
      return cookie.value;
    }

result, same first party: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c,
1407c508-f609-441d-9532-18e2ab87cff2,
983896b9-fb6d-4759-a274-c1e36cfa3a67,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7

result, different first party: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c,
1407c508-f609-441d-9532-18e2ab87cff2,
983896b9-fb6d-4759-a274-c1e36cfa3a67,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7

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 first party: 
55443143-31e2-4079-87ff-2d3d1f51065a,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
736e1b37-65cf-48c4-82c4-eec3a005803b,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
2983da41-73b8-41fc-a719-30cc15f4f8f7

result, different first party: 
55443143-31e2-4079-87ff-2d3d1f51065a,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
736e1b37-65cf-48c4-82c4-eec3a005803b,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
2983da41-73b8-41fc-a719-30cc15f4f8f7

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.
              
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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same first party: 
fake_1882106209481471,
fake_07142064658695157,
fake_5196099218343826,
fake_4225150497580872,
fake_12212018128466928

result, different first party: 
fake_3314592758044672,
fake_27933511551001655,
fake_4072580478409793,
fake_6877057552145425,
fake_8453636931731368

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same first party: 
fake_597042620499064,
fake_14708823022373618,
fake_9220917288838206,
fake_7862893020730497,
fake_32921727237944354

result, different first party: 
fake_6067895402908647,
fake_1072534656164339,
fake_2291056137416565,
fake_5235777700563262,
fake_8897059633685451

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same first party: 
fake_10964265596208822,
fake_0665445205206916,
fake_6158914749924838,
fake_6356273998588351,
fake_4644380785864872

result, different first party: 
fake_10964265596208822,
fake_0665445205206916,
fake_6158914749924838,
fake_6356273998588351,
fake_4644380785864872

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same first party: 
fake_8588047577081401,
fake_07024898981108474,
fake_009219195218375775,
fake_7457896198203144,
fake_8008201837216822

result, different first party: 
fake_261635751646508,
fake_16606904201866768,
fake_008535392937464303,
fake_5072246784087304,
fake_6106401096144776

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same first party: 
fake_6754389766096482,
fake_1158426251003204,
fake_7426368720577412,
fake_3767364497095085,
fake_41965205090089275

result, different first party: 
fake_2813158275729035,
fake_20517834803573365,
fake_3825861726709736,
fake_06492755926031113,
fake_8449394066799076

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same first party: 
fake_8624394795886194,
fake_629800225731193,
fake_9720976906257983,
fake_7916784384418096,
fake_6693946444348955

result, different first party: 
fake_12387376059127009,
fake_9026692966429555,
fake_9155557917055839,
fake_47160507294124865,
fake_590236304838951

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same first party: 
fake_8568611483585771,
fake_30094512376748606,
fake_5016243455014144,
fake_9897699590735565

result, different first party: 
fake_9266673469513336,
fake_9508171362223459,
fake_18360616408577068,
fake_5420094103618391

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: async (key) => {
      const href = testURI("resource", "css", key);
      const head = document.getElementsByTagName("head")[0];
      head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
      const testElement = document.querySelector("#css");
      let fontFamily;
      while (true) {
        await sleepMs(100);
        fontFamily = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same first party: 
fake_03760864841554734,
fake_05697950419802944,
fake_8317931884892802,
fake_7704262825104633,
fake_6849992045536115

result, different first party: 
fake_034765228375315704,
fake_612203186924489,
fake_6765443645854357,
fake_09482405995128018,
fake_9931275593052415

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same first party: 
fake_776766326535681,
fake_6027002088579185,
fake_89604477182882,
fake_8991445189097773,
fake_6394927465859479

result, different first party: 
fake_776766326535681,
fake_6027002088579185,
fake_89604477182882,
fake_8991445189097773,
fake_6394927465859479

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same first party: 
fake_45350076601686284,
fake_303031359304494,
fake_16408129641634162

result, different first party: 
fake_044834183127311356,
fake_17896262748628522,
fake_9995927196246372

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Passed
write: async (key) => {
      const href = testURI("resource", "css", key);
      const head = document.getElementsByTagName("head")[0];
      head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
      const testElement = document.querySelector("#css");
      let fontFamily;
      while (true) {
        await sleepMs(100);
        fontFamily = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same first party: 
fake_3099325432905249,
fake_9628502799898755,
fake_41084337347758226,
fake_7738338781072549,
fake_17604631137750504

result, different first party: 
fake_03986365096311206,
fake_6043331919096318,
fake_6971350491410735,
fake_23914698445451243,
fake_9858613082914143

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same first party: 
fake_821519374588646,
fake_5047097148475035,
fake_8554446731316845,
fake_49104126676300464,
fake_5985429064220715

result, different first party: 
fake_9927513403449404,
fake_24029202834476382,
fake_9330062264509047,
fake_49104126676300464,
fake_5985429064220715

unsupported: false, false, false, false, false

passed: true, true, true, false, false

test failed: false, false, false, false, false
favicon cache
A favicon is an icon that represents a website, typically shown in browser tab and bookmarks menu. If the favicon cache is not partitioned, it can be used to track users across websites.
              
Passed
write: (key) => key

read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
      await sleepMs(2000);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let count = (await response.text()).trim();
      if (count === "0") {
        throw new Error("No requests received");
      }
      return count;
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: (key) => key

read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
      await sleepMs(2000);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let count = (await response.text()).trim();
      if (count === "0") {
        throw new Error("No requests received");
      }
      return count;
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 1, 1, 1, 1, 1

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: (key) => key

read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
      await sleepMs(2000);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let count = (await response.text()).trim();
      if (count === "0") {
        throw new Error("No requests received");
      }
      return count;
    }

result, same first party: 1, 1, 1, 1

result, different first party: 1, 1, 1, 1

unsupported: false, false, false, false

passed: false, false, false, false

test failed: false, false, false, false
Unsupported
write: (key) => key

read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
      await sleepMs(2000);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let count = (await response.text()).trim();
      if (count === "0") {
        throw new Error("No requests received");
      }
      return count;
    }

result, same first party: 1, 1, 1

result, different first party: 1, 1, 1

unsupported: false, false, false

passed: false, false, false

test failed: false, false, false
Passed
write: (key) => key

read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
      await sleepMs(2000);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let count = (await response.text()).trim();
      if (count === "0") {
        throw new Error("No requests received");
      }
      return count;
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: (key) => key

read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
      await sleepMs(2000);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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
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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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
Failed
write: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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: 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let countResponse = await fetch(testURI("ctr", "fetch", key),
                                      {cache: "reload"});
      return (await countResponse.text()).trim();
    }

result, same first party: 1, 1, 1, 1

result, different first party: 2, 2, 2, 2

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let countResponse = await fetch(testURI("ctr", "fetch", key),
                                      {cache: "reload"});
      return (await countResponse.text()).trim();
    }

result, same first party: 1, 1, 1

result, different first party: 2, 2, 2

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Passed
write: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let response = await fetch(
        testURI("ctr", "font", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (key) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let response = await fetch(
        testURI("ctr", "font", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 1, 1, 1, 1, 1

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: async (key) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let response = await fetch(
        testURI("ctr", "font", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1

result, different first party: 2, 2, 2, 2

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: async (key) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let response = await fetch(
        testURI("ctr", "font", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (key) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let response = await fetch(
        testURI("ctr", "font", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 1, 1, 1, 1, 1

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: async (key) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let response = await fetch(
        testURI("ctr", "font", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1

result, different first party: 2, 2, 2

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Passed
write: async (key) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let response = await fetch(
        testURI("ctr", "font", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (key) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let response = await fetch(
        testURI("ctr", "font", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 1, 1, 2, 1, 1

unsupported: false, false, false, false, false

passed: false, false, true, false, false

test failed: false, false, false, false, false
getDirectory
navigator.storage.getDirectory exposes a location for storing files to web content. In some cases, these files may be shared across tabs.
              
Passed
write: async (secret) => {
      try {
        const root = await navigator.storage.getDirectory();
        const fileHandle = await root.getFileHandle("secret.txt", { create: true });
        const stream = await fileHandle.createWritable();
        await stream.write(secret);
        await stream.close();
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      try {
        const root = await navigator.storage.getDirectory();
        const fileHandle = await root.getFileHandle("secret.txt");
        const file = await fileHandle.getFile();
        return file.text();
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

result, same first party: 
7458e015-b20f-4696-982b-aff57b0a74d4,
233e87ca-b8aa-436e-b680-817d86c6acc6,
93c14173-842d-44ed-a4ff-63e04b54c399,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058,
0fffef3e-f7ec-4b63-96e1-3579877405b9

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: 
a532c74b-ccca-4515-a333-acc0a246685e,
101607a1-97bb-463f-a9d1-90092abd8d32,
8db0833d-7b52-46e6-b332-55ab54a0a865,
a349e1c6-758d-4877-aabd-0c7631135118,
d64967c1-e520-4790-8fb7-45ad567e909b

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
Failed
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: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
03b9d753-12c6-4473-b06d-b8373a015a62,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
04fae689-670b-4d64-9966-eb064fc485e2

result, different first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
03b9d753-12c6-4473-b06d-b8373a015a62,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
04fae689-670b-4d64-9966-eb064fc485e2

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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: 
e8304637-cd9b-4058-bcea-626aab9e6c48,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b,
358302cc-de3c-4795-9b0b-887befc03092,
4baa56df-63a7-4df0-ae5c-40889f396f9b,
e1def859-9956-483d-a3e7-968b58011edd

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: 
1493eeef-c081-44cb-8d2a-f4ab9af6a92e,
16ced892-e431-42ab-9017-da51b0a252c4,
b123e636-13a4-400d-9ee2-2c169a0139aa,
c697e0c1-9995-42a9-ba16-79646dbb7080,
5bf95fd8-3c2f-45c7-8f72-f3d86b122801

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: 
c0c1c677-f40a-4384-a88c-e68592da8028,
8611fa70-4e3c-419c-bf1c-14efadf3bf65,
c9d39f37-3482-42a2-8c78-eae8ac064794,
dfcafb86-c9a6-4426-adf1-7e4f52e6c84e

result, different first party: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: async (secret) => {
      try {
        const root = await navigator.storage.getDirectory();
        const fileHandle = await root.getFileHandle("secret.txt", { create: true });
        const stream = await fileHandle.createWritable();
        await stream.write(secret);
        await stream.close();
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      try {
        const root = await navigator.storage.getDirectory();
        const fileHandle = await root.getFileHandle("secret.txt");
        const file = await fileHandle.getFile();
        return file.text();
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

result, same first party: 
14e75fa4-a0d5-4431-9cba-1a4091496414,
d2c62f48-b023-4b69-9342-2c559c33e3e1,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71,
ab020566-d8a9-41af-aec5-58a457f3429a,
7d693c08-ae49-4855-88a9-ca684c95c567

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
Failed
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: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

result, different first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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

result, different first party: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

unsupported: true, true, true

passed: undefined

test failed: false, false, false
Passed
write: async (secret) => {
      try {
        const root = await navigator.storage.getDirectory();
        const fileHandle = await root.getFileHandle("secret.txt", { create: true });
        const stream = await fileHandle.createWritable();
        await stream.write(secret);
        await stream.close();
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      try {
        const root = await navigator.storage.getDirectory();
        const fileHandle = await root.getFileHandle("secret.txt");
        const file = await fileHandle.getFile();
        return file.text();
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

result, same first party: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c,
1407c508-f609-441d-9532-18e2ab87cff2,
983896b9-fb6d-4759-a274-c1e36cfa3a67,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7

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
Failed
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: 
55443143-31e2-4079-87ff-2d3d1f51065a,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
736e1b37-65cf-48c4-82c4-eec3a005803b,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
2983da41-73b8-41fc-a719-30cc15f4f8f7

result, different first party: 
55443143-31e2-4079-87ff-2d3d1f51065a,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
736e1b37-65cf-48c4-82c4-eec3a005803b,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
2983da41-73b8-41fc-a719-30cc15f4f8f7

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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 () => {
      let response = await fetch(`https://h1.privacytests2.org:8901/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
7458e015-b20f-4696-982b-aff57b0a74d4,
233e87ca-b8aa-436e-b680-817d86c6acc6,
93c14173-842d-44ed-a4ff-63e04b54c399,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058,
0fffef3e-f7ec-4b63-96e1-3579877405b9

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 () => {
      let response = await fetch(`https://h1.privacytests2.org:8901/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
a532c74b-ccca-4515-a333-acc0a246685e,
101607a1-97bb-463f-a9d1-90092abd8d32,
8db0833d-7b52-46e6-b332-55ab54a0a865,
a349e1c6-758d-4877-aabd-0c7631135118,
d64967c1-e520-4790-8fb7-45ad567e909b

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (secret) => {
      await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, {cache: "no-store"});
    }

read: async () => {
      let response = await fetch(`https://h1.privacytests2.org:8901/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
03b9d753-12c6-4473-b06d-b8373a015a62,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
04fae689-670b-4d64-9966-eb064fc485e2

result, different first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
03b9d753-12c6-4473-b06d-b8373a015a62,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
04fae689-670b-4d64-9966-eb064fc485e2

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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 () => {
      let response = await fetch(`https://h1.privacytests2.org:8901/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
e8304637-cd9b-4058-bcea-626aab9e6c48,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b,
358302cc-de3c-4795-9b0b-887befc03092,
4baa56df-63a7-4df0-ae5c-40889f396f9b,
e1def859-9956-483d-a3e7-968b58011edd

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 () => {
      let response = await fetch(`https://h1.privacytests2.org:8901/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
1493eeef-c081-44cb-8d2a-f4ab9af6a92e,
16ced892-e431-42ab-9017-da51b0a252c4,
b123e636-13a4-400d-9ee2-2c169a0139aa,
c697e0c1-9995-42a9-ba16-79646dbb7080,
5bf95fd8-3c2f-45c7-8f72-f3d86b122801

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 () => {
      let response = await fetch(`https://h1.privacytests2.org:8901/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
9c2e169f-8427-4aef-a5d9-aae49dd17a75,
93048464-dce7-4a11-bd17-e6d2a9f351ae,
a0218bc8-aa46-4824-814a-e196a157d9ba,
8bb72ef9-2ce9-4c9b-8cc4-3ada65a3c885,
7dcd2a99-0b83-48d4-8de2-36ea2e2e15fa

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 () => {
      let response = await fetch(`https://h1.privacytests2.org:8901/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
c0c1c677-f40a-4384-a88c-e68592da8028,
8611fa70-4e3c-419c-bf1c-14efadf3bf65,
c9d39f37-3482-42a2-8c78-eae8ac064794,
dfcafb86-c9a6-4426-adf1-7e4f52e6c84e

result, different first party: , , , 

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: async (secret) => {
      await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, {cache: "no-store"});
    }

read: async () => {
      let response = await fetch(`https://h1.privacytests2.org:8901/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
14e75fa4-a0d5-4431-9cba-1a4091496414,
d2c62f48-b023-4b69-9342-2c559c33e3e1,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71,
ab020566-d8a9-41af-aec5-58a457f3429a,
7d693c08-ae49-4855-88a9-ca684c95c567

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (secret) => {
      await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, {cache: "no-store"});
    }

read: async () => {
      let response = await fetch(`https://h1.privacytests2.org:8901/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

result, different first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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 () => {
      let response = await fetch(`https://h1.privacytests2.org:8901/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
05da0cf3-c3f1-456e-9131-51fd4bb8933d,
e12f334e-76b0-4ebc-aa46-96e6aa14c022,
39960fb8-e89f-4bf8-99a2-136a8909aa1c

result, different first party: , , 

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Passed
write: async (secret) => {
      await fetch(`https://h1.privacytests2.org:8901/?mode=write&secret=${secret}`, {cache: "no-store"});
    }

read: async () => {
      let response = await fetch(`https://h1.privacytests2.org:8901/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c,
1407c508-f609-441d-9532-18e2ab87cff2,
983896b9-fb6d-4759-a274-c1e36cfa3a67,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7

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 () => {
      let response = await fetch(`https://h1.privacytests2.org:8901/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
55443143-31e2-4079-87ff-2d3d1f51065a,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
736e1b37-65cf-48c4-82c4-eec3a005803b,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
2983da41-73b8-41fc-a719-30cc15f4f8f7

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
H2 connection
HTTP/2 is a web connection protocol introduced in 2015. Some browsers re-use HTTP/2 connections across websites and can thus be used to track users.
              
Passed
write: async (secret) => {
      await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, {cache: "no-store"});
    }

read: async () => {
      let response = await fetch(`https://h2.privacytests2.org:8902/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
7458e015-b20f-4696-982b-aff57b0a74d4,
233e87ca-b8aa-436e-b680-817d86c6acc6,
93c14173-842d-44ed-a4ff-63e04b54c399,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058,
0fffef3e-f7ec-4b63-96e1-3579877405b9

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 () => {
      let response = await fetch(`https://h2.privacytests2.org:8902/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
a532c74b-ccca-4515-a333-acc0a246685e,
101607a1-97bb-463f-a9d1-90092abd8d32,
8db0833d-7b52-46e6-b332-55ab54a0a865,
a349e1c6-758d-4877-aabd-0c7631135118,
d64967c1-e520-4790-8fb7-45ad567e909b

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (secret) => {
      await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, {cache: "no-store"});
    }

read: async () => {
      let response = await fetch(`https://h2.privacytests2.org:8902/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
03b9d753-12c6-4473-b06d-b8373a015a62,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
04fae689-670b-4d64-9966-eb064fc485e2

result, different first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
03b9d753-12c6-4473-b06d-b8373a015a62,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
04fae689-670b-4d64-9966-eb064fc485e2

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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 () => {
      let response = await fetch(`https://h2.privacytests2.org:8902/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
e8304637-cd9b-4058-bcea-626aab9e6c48,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b,
358302cc-de3c-4795-9b0b-887befc03092,
4baa56df-63a7-4df0-ae5c-40889f396f9b,
e1def859-9956-483d-a3e7-968b58011edd

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 () => {
      let response = await fetch(`https://h2.privacytests2.org:8902/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
1493eeef-c081-44cb-8d2a-f4ab9af6a92e,
16ced892-e431-42ab-9017-da51b0a252c4,
b123e636-13a4-400d-9ee2-2c169a0139aa,
c697e0c1-9995-42a9-ba16-79646dbb7080,
5bf95fd8-3c2f-45c7-8f72-f3d86b122801

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 () => {
      let response = await fetch(`https://h2.privacytests2.org:8902/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
9c2e169f-8427-4aef-a5d9-aae49dd17a75,
93048464-dce7-4a11-bd17-e6d2a9f351ae,
a0218bc8-aa46-4824-814a-e196a157d9ba,
8bb72ef9-2ce9-4c9b-8cc4-3ada65a3c885,
7dcd2a99-0b83-48d4-8de2-36ea2e2e15fa

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 () => {
      let response = await fetch(`https://h2.privacytests2.org:8902/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
c0c1c677-f40a-4384-a88c-e68592da8028,
8611fa70-4e3c-419c-bf1c-14efadf3bf65,
c9d39f37-3482-42a2-8c78-eae8ac064794,
dfcafb86-c9a6-4426-adf1-7e4f52e6c84e

result, different first party: , , , 

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: async (secret) => {
      await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, {cache: "no-store"});
    }

read: async () => {
      let response = await fetch(`https://h2.privacytests2.org:8902/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
14e75fa4-a0d5-4431-9cba-1a4091496414,
d2c62f48-b023-4b69-9342-2c559c33e3e1,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71,
ab020566-d8a9-41af-aec5-58a457f3429a,
7d693c08-ae49-4855-88a9-ca684c95c567

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (secret) => {
      await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, {cache: "no-store"});
    }

read: async () => {
      let response = await fetch(`https://h2.privacytests2.org:8902/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

result, different first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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 () => {
      let response = await fetch(`https://h2.privacytests2.org:8902/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
05da0cf3-c3f1-456e-9131-51fd4bb8933d,
e12f334e-76b0-4ebc-aa46-96e6aa14c022,
39960fb8-e89f-4bf8-99a2-136a8909aa1c

result, different first party: , , 

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Passed
write: async (secret) => {
      await fetch(`https://h2.privacytests2.org:8902/?mode=write&secret=${secret}`, {cache: "no-store"});
    }

read: async () => {
      let response = await fetch(`https://h2.privacytests2.org:8902/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c,
1407c508-f609-441d-9532-18e2ab87cff2,
983896b9-fb6d-4759-a274-c1e36cfa3a67,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7

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 () => {
      let response = await fetch(`https://h2.privacytests2.org:8902/?mode=read`, {cache: "no-store"});
      return await response.text();
    }

result, same first party: 
55443143-31e2-4079-87ff-2d3d1f51065a,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
736e1b37-65cf-48c4-82c4-eec3a005803b,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
2983da41-73b8-41fc-a719-30cc15f4f8f7

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?
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`, {cache: "no-store"});
      let text = await response.text();
      // Empty response text indicates we are not connecting over h3:
      if (text.trim() === "") {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`);
      return await response.text();
    }

result, same first party: 
cf6b75468e2411279a1a1a9286e3c562,
d0c4ed8299093c579ed47b9b641720b4,
d8c4907ec08738bb37a6e51e6ae1e47c,
cb6cbc20b0366522fdebcb5e142fb301,
de10ab40ccd84867d738310c2080b3ff

result, different first party: 
ea27910a285a72a42edf1544a48e0dbd,
a108b9bbd14bb943e9fd24a965318494,
a209c9065849e4172280818b33008f24,
258c9db31fc00bf8265b73cf42911c04,
762035835f383dacf6ce0423ae72b12d

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?
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`, {cache: "no-store"});
      let text = await response.text();
      // Empty response text indicates we are not connecting over h3:
      if (text.trim() === "") {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`);
      return await response.text();
    }

result, same first party: 
292719128a9a1bcb6ebfbbf0fa799103,
17938237f427638dc029d804afc77165,
95846a6eb2c09e658341821f86ee6b62,
f64a267d8364eb369fbecaf4233906da,
b12ac5b62c3d043c82e4f3ebee64ec7a

result, different first party: 
b5cbde78c96a56c63a8440d43c32e797,
c779b19b0e18c39297166b21c851e1cf,
c80384669e3b37e66e2a41704a2e7c7a,
0f4292e0dca9c3867378eec449f35503,
91108f19f6fdf92cb8f640698fb836a9

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
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?
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`, {cache: "no-store"});
      let text = await response.text();
      // Empty response text indicates we are not connecting over h3:
      if (text.trim() === "") {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`);
      return await response.text();
    }

result, same first party: 
85bfb40852d67855ce208a175ca8ca7a,
a11e9c859ff7d0c0cd8c6bbb50fe07e0,
45619a534533f52d87a6fb326a1fa9c5,
ca63bb2a3169962ea7a1105470444ae9,
56674ee70244644badf12f01a24a5958

result, different first party: 
85bfb40852d67855ce208a175ca8ca7a,
a11e9c859ff7d0c0cd8c6bbb50fe07e0,
45619a534533f52d87a6fb326a1fa9c5,
ca63bb2a3169962ea7a1105470444ae9,
56674ee70244644badf12f01a24a5958

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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?
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`, {cache: "no-store"});
      let text = await response.text();
      // Empty response text indicates we are not connecting over h3:
      if (text.trim() === "") {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`);
      return await response.text();
    }

result, same first party: 
dad622405067a05a812c684ec8c75cd6,
eeba0be767bd82f18b8c6c6322e5b9db,
4ea2f41a526a2b2a90249d995d2e949b,
f80120cbc9ec52afbd41b7b7e86dae5b,
6147249dd5587c0a7b6cb8c825bb3ba4

result, different first party: 
61c489255192e7fe3988150d7e424d0e,
08a235790b107f260ae57b11aec9ff5d,
1b1f7ad3e8e9fa7e7a39cf7858240e2f,
6cb34c24af2b5a25ef54c3fd3b5ed7c8,
25d9906228bfe079880a93253def098a

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?
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`, {cache: "no-store"});
      let text = await response.text();
      // Empty response text indicates we are not connecting over h3:
      if (text.trim() === "") {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`);
      return await response.text();
    }

result, same first party: 
9a557806011776a531bfc4f8646c7778,
a9b79177ecbc346b4928a2458a539f76,
207e5a8a220b0cf21c39766a5ded3cf1,
252c7b4f5fe0621e3373ce6834df8f45,
dee29e3dcc54cd3df4677906af3e22f4

result, different first party: 
21fbcc88e918f072e035cc919f6aafe6,
bd5fbe1248770dc1b9bed8ebf3533f99,
4248ea6ac845deacb263c6f2d5fe7d87,
9e0a3e231170f6c73d324669ac400e64,
43c4745cff26002e5650c5b45e3a4cb6

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?
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`, {cache: "no-store"});
      let text = await response.text();
      // Empty response text indicates we are not connecting over h3:
      if (text.trim() === "") {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`);
      return await response.text();
    }

result, same first party: 
124cd020116423d148e41afc0313eb9d,
d326de139136637328c66439ff56e1e8,
6b4f540a2c59f21abcdcee68f33fe92c,
f7c2ff93b8d95825682afcbd0bd65eb5,
bf46b4b3425ef7c79be9ab2dad49fcb8

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?
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`, {cache: "no-store"});
      let text = await response.text();
      // Empty response text indicates we are not connecting over h3:
      if (text.trim() === "") {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`);
      return await response.text();
    }

result, same first party: 
a3d4d199b60d99e36430105aefc3df0a,
a6dfab197f628eb1e06b55795339d1e1,
5a06994d286ef972475f586159f1f134,
6a6060dd9e0ba3544068b85b4680715e

result, different first party: , 33a3ae83d9d52c76aaea0e4c0c6bdcee, 34aad371a1c9da00f13bb83fc6635d81, 4d9e64183ca369dee92a96637e54906c

unsupported: false, false, false, false

passed: true, true, true, true

test failed: 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?
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`, {cache: "no-store"});
      let text = await response.text();
      // Empty response text indicates we are not connecting over h3:
      if (text.trim() === "") {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`);
      return await response.text();
    }

result, same first party: 
abda37d7764b5657c82c86040a278114,
7311bf05b05ebf7fc136b6adad59e8ab,
2f76ecf1a7e0d721308515025527fc47,
126e6689d69769a86740412ddab3d025,
48cc4ca6afeef8a696454c20868af783

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?
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`, {cache: "no-store"});
      let text = await response.text();
      // Empty response text indicates we are not connecting over h3:
      if (text.trim() === "") {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let 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
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?
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`, {cache: "no-store"});
      let text = await response.text();
      // Empty response text indicates we are not connecting over h3:
      if (text.trim() === "") {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let 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

passed: undefined

test failed: false, false, false
Passed
write: async (secret) => {
      // Ensure that we can switch over to h3 via alt-svc:
      for (let i = 0; i<3; ++i) {
        await fetch(`https://h3.privacytests2.org:4434/connection_id`, {cache: "no-store"});
        await sleepMs(500);
      }
      // Are we now connecting over h3?
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`, {cache: "no-store"});
      let text = await response.text();
      // Empty response text indicates we are not connecting over h3:
      if (text.trim() === "") {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`);
      return await response.text();
    }

result, same first party: 
c0505ae45f1f7e57b6a92c55d426f066,
cdc678baf071038470b8f8adc87aaa3d,
c18993de4aab89ee46679d7670dfcbde,
68ce3717fb2ad9ae13a68530a3192d88,
9cfd36509173725c4b07312f2d6be4a8

result, different first party: 
a5f38a9883cc08f3819853f95c642fad,
e954ce7078c4f8776dd6f5468b9f1880,
8a79aab20d5b01b0fc64f2131cdc3c27,
d76b03b211b2baf84c38b21ac430d0b8,
1b2942fe6c36e08b5117f09c98192b32

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?
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`, {cache: "no-store"});
      let text = await response.text();
      // Empty response text indicates we are not connecting over h3:
      if (text.trim() === "") {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let response = await fetch(`https://h3.privacytests2.org:4434/connection_id`);
      return await response.text();
    }

result, same first party: 
3d1aee3789fa045f88c4bebf554de9e4,
4f8f44316dafb8274f9886e2bb5e4075,
4a09d0290f31a2ad18b6b77bee222e97,
6f6b615780145e7be950929cfb380223,
57fe2e9aad4a9c9f9cd4494c71adbcf1

result, different first party: , a82737347a92b99d503b93ec2ce669c1, b41c3bf621b9a23a01fd8a894c415dc8, 0ed835e4801553e18d5ab1bd0d2ed072, c0890ee7c64166957f7b45a6ba9fc4ff

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."
              
Passed
write: set HSTS flag

read: read HSTS flag

result, same first party: not tested, not tested, not tested, not tested, not tested

result, different first party: Used http, Used http, Used http, Used http, Used http

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
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
Passed
write: set HSTS flag

read: read HSTS flag

result, same first party: not tested, not tested, not tested, not tested, not tested

result, different first party: Used http, Used http, Used http, Used http, Used http

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: null

read: null

result, same first party: , , , , 

result, different first party: 
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected

unsupported: , , , , 

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: null

read: null

result, same first party: , , , 

result, different first party: 
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected

unsupported: , , , 

passed: true, true, true, true

test failed: 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
Passed
write: null

read: null

result, same first party: , , 

result, different first party: 
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected

unsupported: , , 

passed: true, true, true

test failed: false, false, false
Failed
write: set HSTS flag

read: read HSTS flag

result, same first party: not tested, not tested, not tested, not tested, not tested

result, different first party: 
Upgraded to https,
Upgraded to https,
Upgraded to https,
Upgraded to https,
Upgraded to https

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
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."
              
Passed
write: set HSTS flag

read: read HSTS flag

result, same first party: not tested, not tested, not tested, not tested, not tested

result, different first party: Used http, Used http, Used http, Used http, Used http

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
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
Passed
write: set HSTS flag

read: read HSTS flag

result, same first party: not tested, not tested, not tested, not tested, not tested

result, different first party: Used http, Used http, Used http, Used http, Used http

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: null

read: null

result, same first party: , , , , 

result, different first party: 
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected

unsupported: , , , , 

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: null

read: null

result, same first party: , , , 

result, different first party: 
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected

unsupported: , , , 

passed: true, true, true, true

test failed: 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
Passed
write: null

read: null

result, same first party: , , 

result, different first party: 
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected,
HTTPS used by default; no HSTS cache issue expected

unsupported: , , 

passed: true, true, true

test failed: false, false, false
Failed
write: set HSTS flag

read: read HSTS flag

result, same first party: not tested, not tested, not tested, not tested, not tested

result, different first party: 
Upgraded to https,
Upgraded to https,
Upgraded to https,
Upgraded to https,
Upgraded to https

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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
Failed
write: (key) => new Promise((resolve, reject) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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: 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let response = await fetch(
        testURI("ctr", "page", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1

result, different first party: 2, 2, 2, 2

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let response = await fetch(
        testURI("ctr", "page", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1

result, different first party: 2, 2, 2

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let response = await fetch(
        testURI("ctr", "image", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let response = await fetch(
        testURI("ctr", "image", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 1, 1, 1, 1, 1

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let response = await fetch(
        testURI("ctr", "image", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1

result, different first party: 2, 2, 2, 2

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let response = await fetch(
        testURI("ctr", "image", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let response = await fetch(
        testURI("ctr", "image", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 1, 1, 1, 1, 1

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let response = await fetch(
        testURI("ctr", "image", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1

result, different first party: 2, 2, 2

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Passed
write: (key) => new Promise((resolve, reject) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let response = await fetch(
        testURI("ctr", "image", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let response = await fetch(
        testURI("ctr", "image", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 1, 1, 2, 1, 1

unsupported: false, false, false, false, false

passed: false, false, true, false, false

test failed: false, false, false, false, false
indexedDB
The IndexedDB API exposes a transactional database to web pages. That database can be used to track users across websites, unless it is partitioned.
              
Passed
write: async (secret) => {
      try {
        return await IdbKeyVal.set("secret", secret);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: () => IdbKeyVal.get("secret")

result, same first party: 
7458e015-b20f-4696-982b-aff57b0a74d4,
233e87ca-b8aa-436e-b680-817d86c6acc6,
93c14173-842d-44ed-a4ff-63e04b54c399,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058,
0fffef3e-f7ec-4b63-96e1-3579877405b9

result, different first party: 
Error: The user denied permission to access the database.,
Error: The user denied permission to access the database.,
Error: The user denied permission to access the database.,
Error: The user denied permission to access the database.,
Error: The user denied permission to access the database.

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: 
a532c74b-ccca-4515-a333-acc0a246685e,
101607a1-97bb-463f-a9d1-90092abd8d32,
8db0833d-7b52-46e6-b332-55ab54a0a865,
a349e1c6-758d-4877-aabd-0c7631135118,
d64967c1-e520-4790-8fb7-45ad567e909b

result, different first party: 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 first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
03b9d753-12c6-4473-b06d-b8373a015a62,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
04fae689-670b-4d64-9966-eb064fc485e2

result, different first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
03b9d753-12c6-4473-b06d-b8373a015a62,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
04fae689-670b-4d64-9966-eb064fc485e2

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 first party: 
e8304637-cd9b-4058-bcea-626aab9e6c48,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b,
358302cc-de3c-4795-9b0b-887befc03092,
4baa56df-63a7-4df0-ae5c-40889f396f9b,
e1def859-9956-483d-a3e7-968b58011edd

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: 
1493eeef-c081-44cb-8d2a-f4ab9af6a92e,
16ced892-e431-42ab-9017-da51b0a252c4,
b123e636-13a4-400d-9ee2-2c169a0139aa,
c697e0c1-9995-42a9-ba16-79646dbb7080,
5bf95fd8-3c2f-45c7-8f72-f3d86b122801

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: 
9c2e169f-8427-4aef-a5d9-aae49dd17a75,
93048464-dce7-4a11-bd17-e6d2a9f351ae,
a0218bc8-aa46-4824-814a-e196a157d9ba,
8bb72ef9-2ce9-4c9b-8cc4-3ada65a3c885,
7dcd2a99-0b83-48d4-8de2-36ea2e2e15fa

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: 
c0c1c677-f40a-4384-a88c-e68592da8028,
8611fa70-4e3c-419c-bf1c-14efadf3bf65,
c9d39f37-3482-42a2-8c78-eae8ac064794,
dfcafb86-c9a6-4426-adf1-7e4f52e6c84e

result, different first party: undefined

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: async (secret) => {
      try {
        return await IdbKeyVal.set("secret", secret);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: () => IdbKeyVal.get("secret")

result, same first party: 
14e75fa4-a0d5-4431-9cba-1a4091496414,
d2c62f48-b023-4b69-9342-2c559c33e3e1,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71,
ab020566-d8a9-41af-aec5-58a457f3429a,
7d693c08-ae49-4855-88a9-ca684c95c567

result, different first party: 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 first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

result, different first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

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 first party: 
05da0cf3-c3f1-456e-9131-51fd4bb8933d,
e12f334e-76b0-4ebc-aa46-96e6aa14c022,
39960fb8-e89f-4bf8-99a2-136a8909aa1c

result, different first party: 
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Passed
write: async (secret) => {
      try {
        return await IdbKeyVal.set("secret", secret);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: () => IdbKeyVal.get("secret")

result, same first party: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c,
1407c508-f609-441d-9532-18e2ab87cff2,
983896b9-fb6d-4759-a274-c1e36cfa3a67,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7

result, different first party: 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 first party: 
55443143-31e2-4079-87ff-2d3d1f51065a,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
736e1b37-65cf-48c4-82c4-eec3a005803b,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
2983da41-73b8-41fc-a719-30cc15f4f8f7

result, different first party: 
55443143-31e2-4079-87ff-2d3d1f51065a,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
736e1b37-65cf-48c4-82c4-eec3a005803b,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
2983da41-73b8-41fc-a719-30cc15f4f8f7

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.
              
Passed
write: (secret) => localStorage.setItem("secret", secret)

read: () => localStorage.getItem("secret")

result, same first party: 
7458e015-b20f-4696-982b-aff57b0a74d4,
233e87ca-b8aa-436e-b680-817d86c6acc6,
93c14173-842d-44ed-a4ff-63e04b54c399,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058,
0fffef3e-f7ec-4b63-96e1-3579877405b9

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) => localStorage.setItem("secret", secret)

read: () => localStorage.getItem("secret")

result, same first party: 
a532c74b-ccca-4515-a333-acc0a246685e,
101607a1-97bb-463f-a9d1-90092abd8d32,
8db0833d-7b52-46e6-b332-55ab54a0a865,
a349e1c6-758d-4877-aabd-0c7631135118,
d64967c1-e520-4790-8fb7-45ad567e909b

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (secret) => localStorage.setItem("secret", secret)

read: () => localStorage.getItem("secret")

result, same first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
03b9d753-12c6-4473-b06d-b8373a015a62,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
04fae689-670b-4d64-9966-eb064fc485e2

result, different first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
03b9d753-12c6-4473-b06d-b8373a015a62,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
04fae689-670b-4d64-9966-eb064fc485e2

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: (secret) => localStorage.setItem("secret", secret)

read: () => localStorage.getItem("secret")

result, same first party: 
e8304637-cd9b-4058-bcea-626aab9e6c48,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b,
358302cc-de3c-4795-9b0b-887befc03092,
4baa56df-63a7-4df0-ae5c-40889f396f9b,
e1def859-9956-483d-a3e7-968b58011edd

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) => localStorage.setItem("secret", secret)

read: () => localStorage.getItem("secret")

result, same first party: 
1493eeef-c081-44cb-8d2a-f4ab9af6a92e,
16ced892-e431-42ab-9017-da51b0a252c4,
b123e636-13a4-400d-9ee2-2c169a0139aa,
c697e0c1-9995-42a9-ba16-79646dbb7080,
5bf95fd8-3c2f-45c7-8f72-f3d86b122801

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) => localStorage.setItem("secret", secret)

read: () => localStorage.getItem("secret")

result, same first party: 
9c2e169f-8427-4aef-a5d9-aae49dd17a75,
93048464-dce7-4a11-bd17-e6d2a9f351ae,
a0218bc8-aa46-4824-814a-e196a157d9ba,
8bb72ef9-2ce9-4c9b-8cc4-3ada65a3c885,
7dcd2a99-0b83-48d4-8de2-36ea2e2e15fa

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) => localStorage.setItem("secret", secret)

read: () => localStorage.getItem("secret")

result, same first party: 
c0c1c677-f40a-4384-a88c-e68592da8028,
8611fa70-4e3c-419c-bf1c-14efadf3bf65,
c9d39f37-3482-42a2-8c78-eae8ac064794,
dfcafb86-c9a6-4426-adf1-7e4f52e6c84e

result, different first party: , , , 

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: (secret) => localStorage.setItem("secret", secret)

read: () => localStorage.getItem("secret")

result, same first party: 
14e75fa4-a0d5-4431-9cba-1a4091496414,
d2c62f48-b023-4b69-9342-2c559c33e3e1,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71,
ab020566-d8a9-41af-aec5-58a457f3429a,
7d693c08-ae49-4855-88a9-ca684c95c567

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (secret) => localStorage.setItem("secret", secret)

read: () => localStorage.getItem("secret")

result, same first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

result, different first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: (secret) => localStorage.setItem("secret", secret)

read: () => localStorage.getItem("secret")

result, same first party: 
05da0cf3-c3f1-456e-9131-51fd4bb8933d,
e12f334e-76b0-4ebc-aa46-96e6aa14c022,
39960fb8-e89f-4bf8-99a2-136a8909aa1c

result, different first party: 
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Passed
write: (secret) => localStorage.setItem("secret", secret)

read: () => localStorage.getItem("secret")

result, same first party: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c,
1407c508-f609-441d-9532-18e2ab87cff2,
983896b9-fb6d-4759-a274-c1e36cfa3a67,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (secret) => localStorage.setItem("secret", secret)

read: () => localStorage.getItem("secret")

result, same first party: 
55443143-31e2-4079-87ff-2d3d1f51065a,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
736e1b37-65cf-48c4-82c4-eec3a005803b,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
2983da41-73b8-41fc-a719-30cc15f4f8f7

result, different first party: 
55443143-31e2-4079-87ff-2d3d1f51065a,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
736e1b37-65cf-48c4-82c4-eec3a005803b,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
2983da41-73b8-41fc-a719-30cc15f4f8f7

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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((f,r) => {}));
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].clientId;
      } else {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      if (navigator.locks) {
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].name;
      }
    }

result, same first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

result, different first party: 
Error: The request was denied.,
Error: The request was denied.,
Error: The request was denied.,
Error: The request was denied.,
Error: The request was denied.

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((f,r) => {}));
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].clientId;
      } else {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      if (navigator.locks) {
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].name;
      }
    }

result, same first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

result, different first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (navigator.locks) {
        navigator.locks.request(key, lock => new Promise((f,r) => {}));
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].clientId;
      } else {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      if (navigator.locks) {
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].name;
      }
    }

result, same first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

result, different first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (navigator.locks) {
        navigator.locks.request(key, lock => new Promise((f,r) => {}));
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].clientId;
      } else {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      if (navigator.locks) {
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].name;
      }
    }

result, same first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

result, different first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (navigator.locks) {
        navigator.locks.request(key, lock => new Promise((f,r) => {}));
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].clientId;
      } else {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      if (navigator.locks) {
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].name;
      }
    }

result, same first party: 
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined

result, different first party: 
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (navigator.locks) {
        navigator.locks.request(key, lock => new Promise((f,r) => {}));
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].clientId;
      } else {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      if (navigator.locks) {
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].name;
      }
    }

result, same first party: 
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined

result, different first party: 
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (navigator.locks) {
        navigator.locks.request(key, lock => new Promise((f,r) => {}));
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].clientId;
      } else {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      if (navigator.locks) {
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].name;
      }
    }

result, same first party: 
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined

result, different first party: 
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined

unsupported: false, false, false, false

passed: undefined

test failed: true, true, true, true
Passed
write: async (key) => {
      if (navigator.locks) {
        navigator.locks.request(key, lock => new Promise((f,r) => {}));
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].clientId;
      } else {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      if (navigator.locks) {
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].name;
      }
    }

result, same first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

result, different first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (navigator.locks) {
        navigator.locks.request(key, lock => new Promise((f,r) => {}));
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].clientId;
      } else {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      if (navigator.locks) {
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].name;
      }
    }

result, same first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

result, different first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (navigator.locks) {
        navigator.locks.request(key, lock => new Promise((f,r) => {}));
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].clientId;
      } else {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      if (navigator.locks) {
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].name;
      }
    }

result, same first party: 
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined,
Error: queryResult.held[0] is undefined

result, different first party: 
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context,
Error: LockManager.query: query() is not allowed in this context

unsupported: false, false, false

passed: undefined

test failed: true, true, true
Passed
write: async (key) => {
      if (navigator.locks) {
        navigator.locks.request(key, lock => new Promise((f,r) => {}));
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].clientId;
      } else {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      if (navigator.locks) {
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].name;
      }
    }

result, same first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

result, different first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (navigator.locks) {
        navigator.locks.request(key, lock => new Promise((f,r) => {}));
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].clientId;
      } else {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      if (navigator.locks) {
        let queryResult = await navigator.locks.query();
        return queryResult.held[0].name;
      }
    }

result, same first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

result, different first party: 
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name'),
Error: Cannot read properties of undefined (reading 'name')

unsupported: false, false, false, false, false

passed: 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.
              
Passed
write: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      return key;
    }

read: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      await sleepMs(500);
      let response = await fetch(
        testURI("ctr", "prefetch", key), {"cache": "reload"});
      let countString = (await response.text()).trim();
      if (parseInt(countString) === 0) {
        throw new Error("No requests received");
      }
      return countString;
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      return key;
    }

read: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      await sleepMs(500);
      let response = await fetch(
        testURI("ctr", "prefetch", key), {"cache": "reload"});
      let countString = (await response.text()).trim();
      if (parseInt(countString) === 0) {
        throw new Error("No requests received");
      }
      return countString;
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      return key;
    }

read: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      await sleepMs(500);
      let response = await fetch(
        testURI("ctr", "prefetch", key), {"cache": "reload"});
      let countString = (await response.text()).trim();
      if (parseInt(countString) === 0) {
        throw new Error("No requests received");
      }
      return countString;
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 1, 1, 1, 1, 1

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      return key;
    }

read: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      await sleepMs(500);
      let response = await fetch(
        testURI("ctr", "prefetch", key), {"cache": "reload"});
      let countString = (await response.text()).trim();
      if (parseInt(countString) === 0) {
        throw new Error("No requests received");
      }
      return countString;
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      return key;
    }

read: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      await sleepMs(500);
      let response = await fetch(
        testURI("ctr", "prefetch", key), {"cache": "reload"});
      let countString = (await response.text()).trim();
      if (parseInt(countString) === 0) {
        throw new Error("No requests received");
      }
      return countString;
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      return key;
    }

read: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      await sleepMs(500);
      let response = await fetch(
        testURI("ctr", "prefetch", key), {"cache": "reload"});
      let countString = (await response.text()).trim();
      if (parseInt(countString) === 0) {
        throw new Error("No requests received");
      }
      return countString;
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Unsupported
write: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      return key;
    }

read: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      await sleepMs(500);
      let response = await fetch(
        testURI("ctr", "prefetch", key), {"cache": "reload"});
      let 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

result, different first party: 
Error: No requests received,
Error: No requests received,
Error: No requests received,
Error: No requests received

unsupported: true, true, true, true

passed: undefined

test failed: false, false, false, false
Passed
write: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      return key;
    }

read: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      await sleepMs(500);
      let response = await fetch(
        testURI("ctr", "prefetch", key), {"cache": "reload"});
      let countString = (await response.text()).trim();
      if (parseInt(countString) === 0) {
        throw new Error("No requests received");
      }
      return countString;
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      return key;
    }

read: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      await sleepMs(500);
      let response = await fetch(
        testURI("ctr", "prefetch", key), {"cache": "reload"});
      let countString = (await response.text()).trim();
      if (parseInt(countString) === 0) {
        throw new Error("No requests received");
      }
      return countString;
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 1, 1, 1, 1, 1

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Unsupported
write: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      return key;
    }

read: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      await sleepMs(500);
      let response = await fetch(
        testURI("ctr", "prefetch", key), {"cache": "reload"});
      let 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

result, different first party: 
Error: No requests received,
Error: No requests received,
Error: No requests received

unsupported: true, true, true

passed: undefined

test failed: false, false, false
Passed
write: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      return key;
    }

read: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      await sleepMs(500);
      let response = await fetch(
        testURI("ctr", "prefetch", key), {"cache": "reload"});
      let countString = (await response.text()).trim();
      if (parseInt(countString) === 0) {
        throw new Error("No requests received");
      }
      return countString;
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      return key;
    }

read: async (key) => {
      let link = document.createElement("link");
      link.rel = "prefetch";
      link.href = testURI("resource", "prefetch", key);
      document.getElementsByTagName("head")[0].appendChild(link);
      await sleepMs(500);
      let response = await fetch(
        testURI("ctr", "prefetch", key), {"cache": "reload"});
      let countString = (await response.text()).trim();
      if (parseInt(countString) === 0) {
        throw new Error("No requests received");
      }
      return countString;
    }

result, same first party: 1, 1, 1, 1, 1

result, different first party: 1, 2, 2, 1, 1

unsupported: false, false, false, false, false

passed: false, true, true, false, false

test failed: false, false, false, false, false
ServiceWorker
The ServiceWorker API allows websites to run code in the background and store content in the browser for offline use. If a ServiceWorker can be accessed from multiple websites, it can be abused to track users across sites.
              
Passed
write: async (key) => {
      if (!navigator.serviceWorker) {
        throw new Error("Unsupported");
      }
      let registration = await navigator.serviceWorker.register(
        'serviceWorker.js');
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      await fetch(`serviceworker-write?secret=${key}`);
    }

read: async () => {
      console.log("trying to register the serviceworker now...");
      const registration = await Promise.race([
        navigator.serviceWorker.register('serviceWorker.js'),
        sleepMs(500)
      ]);
      if (registration === undefined) {
        // We timed out or otherwise failed.
        throw new Error("ServiceWorker registration failed");
      }
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      let response = await fetch("serviceworker-read");
      return await response.text();
    }

result, same first party: , , , , 

result, different first party: 
Error: Failed to register a ServiceWorker for scope ('https://test-pages.privacytests2.org/') with script ('https://test-pages.privacytests2.org/serviceWorker.js'): The user denied permission to use Service Worker.,
Error: Failed to register a ServiceWorker for scope ('https://test-pages.privacytests2.org/') with script ('https://test-pages.privacytests2.org/serviceWorker.js'): The user denied permission to use Service Worker.,
Error: Failed to register a ServiceWorker for scope ('https://test-pages.privacytests2.org/') with script ('https://test-pages.privacytests2.org/serviceWorker.js'): The user denied permission to use Service Worker.,
Error: Failed to register a ServiceWorker for scope ('https://test-pages.privacytests2.org/') with script ('https://test-pages.privacytests2.org/serviceWorker.js'): The user denied permission to use Service Worker.,
Error: Failed to register a ServiceWorker for scope ('https://test-pages.privacytests2.org/') with script ('https://test-pages.privacytests2.org/serviceWorker.js'): The user denied permission to use Service Worker.

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (!navigator.serviceWorker) {
        throw new Error("Unsupported");
      }
      let registration = await navigator.serviceWorker.register(
        'serviceWorker.js');
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      await fetch(`serviceworker-write?secret=${key}`);
    }

read: async () => {
      console.log("trying to register the serviceworker now...");
      const registration = await Promise.race([
        navigator.serviceWorker.register('serviceWorker.js'),
        sleepMs(500)
      ]);
      if (registration === undefined) {
        // We timed out or otherwise failed.
        throw new Error("ServiceWorker registration failed");
      }
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      let response = await fetch("serviceworker-read");
      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 (key) => {
      if (!navigator.serviceWorker) {
        throw new Error("Unsupported");
      }
      let registration = await navigator.serviceWorker.register(
        'serviceWorker.js');
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      await fetch(`serviceworker-write?secret=${key}`);
    }

read: async () => {
      console.log("trying to register the serviceworker now...");
      const registration = await Promise.race([
        navigator.serviceWorker.register('serviceWorker.js'),
        sleepMs(500)
      ]);
      if (registration === undefined) {
        // We timed out or otherwise failed.
        throw new Error("ServiceWorker registration failed");
      }
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      let response = await fetch("serviceworker-read");
      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 (key) => {
      if (!navigator.serviceWorker) {
        throw new Error("Unsupported");
      }
      let registration = await navigator.serviceWorker.register(
        'serviceWorker.js');
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      await fetch(`serviceworker-write?secret=${key}`);
    }

read: async () => {
      console.log("trying to register the serviceworker now...");
      const registration = await Promise.race([
        navigator.serviceWorker.register('serviceWorker.js'),
        sleepMs(500)
      ]);
      if (registration === undefined) {
        // We timed out or otherwise failed.
        throw new Error("ServiceWorker registration failed");
      }
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      let response = await fetch("serviceworker-read");
      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 (key) => {
      if (!navigator.serviceWorker) {
        throw new Error("Unsupported");
      }
      let registration = await navigator.serviceWorker.register(
        'serviceWorker.js');
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      await fetch(`serviceworker-write?secret=${key}`);
    }

read: async () => {
      console.log("trying to register the serviceworker now...");
      const registration = await Promise.race([
        navigator.serviceWorker.register('serviceWorker.js'),
        sleepMs(500)
      ]);
      if (registration === undefined) {
        // We timed out or otherwise failed.
        throw new Error("ServiceWorker registration failed");
      }
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      let response = await fetch("serviceworker-read");
      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
Unsupported
write: async (key) => {
      if (!navigator.serviceWorker) {
        throw new Error("Unsupported");
      }
      let registration = await navigator.serviceWorker.register(
        'serviceWorker.js');
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      await fetch(`serviceworker-write?secret=${key}`);
    }

read: async () => {
      console.log("trying to register the serviceworker now...");
      const registration = await Promise.race([
        navigator.serviceWorker.register('serviceWorker.js'),
        sleepMs(500)
      ]);
      if (registration === undefined) {
        // We timed out or otherwise failed.
        throw new Error("ServiceWorker registration failed");
      }
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      let response = await fetch("serviceworker-read");
      return await response.text();
    }

result, same first party: 
Error: navigator.serviceWorker is undefined,
Error: navigator.serviceWorker is undefined,
Error: navigator.serviceWorker is undefined,
Error: navigator.serviceWorker is undefined,
Error: navigator.serviceWorker is undefined

result, different first party: 
Error: navigator.serviceWorker is undefined,
Error: navigator.serviceWorker is undefined,
Error: navigator.serviceWorker is undefined,
Error: navigator.serviceWorker is undefined,
Error: navigator.serviceWorker is undefined

unsupported: true, true, true, true, true

passed: undefined

test failed: false, false, false, false, false
Passed
write: async (key) => {
      if (!navigator.serviceWorker) {
        throw new Error("Unsupported");
      }
      let registration = await navigator.serviceWorker.register(
        'serviceWorker.js');
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      await fetch(`serviceworker-write?secret=${key}`);
    }

read: async () => {
      console.log("trying to register the serviceworker now...");
      const registration = await Promise.race([
        navigator.serviceWorker.register('serviceWorker.js'),
        sleepMs(500)
      ]);
      if (registration === undefined) {
        // We timed out or otherwise failed.
        throw new Error("ServiceWorker registration failed");
      }
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      let response = await fetch("serviceworker-read");
      return await response.text();
    }

result, same first party: , , , 

result, different first party: , , , 

unsupported: false, false, false, false

passed: undefined

test failed: true, true, true, true
Passed
write: async (key) => {
      if (!navigator.serviceWorker) {
        throw new Error("Unsupported");
      }
      let registration = await navigator.serviceWorker.register(
        'serviceWorker.js');
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      await fetch(`serviceworker-write?secret=${key}`);
    }

read: async () => {
      console.log("trying to register the serviceworker now...");
      const registration = await Promise.race([
        navigator.serviceWorker.register('serviceWorker.js'),
        sleepMs(500)
      ]);
      if (registration === undefined) {
        // We timed out or otherwise failed.
        throw new Error("ServiceWorker registration failed");
      }
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      let response = await fetch("serviceworker-read");
      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 (key) => {
      if (!navigator.serviceWorker) {
        throw new Error("Unsupported");
      }
      let registration = await navigator.serviceWorker.register(
        'serviceWorker.js');
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      await fetch(`serviceworker-write?secret=${key}`);
    }

read: async () => {
      console.log("trying to register the serviceworker now...");
      const registration = await Promise.race([
        navigator.serviceWorker.register('serviceWorker.js'),
        sleepMs(500)
      ]);
      if (registration === undefined) {
        // We timed out or otherwise failed.
        throw new Error("ServiceWorker registration failed");
      }
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      let response = await fetch("serviceworker-read");
      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
Unsupported
write: async (key) => {
      if (!navigator.serviceWorker) {
        throw new Error("Unsupported");
      }
      let registration = await navigator.serviceWorker.register(
        'serviceWorker.js');
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      await fetch(`serviceworker-write?secret=${key}`);
    }

read: async () => {
      console.log("trying to register the serviceworker now...");
      const registration = await Promise.race([
        navigator.serviceWorker.register('serviceWorker.js'),
        sleepMs(500)
      ]);
      if (registration === undefined) {
        // We timed out or otherwise failed.
        throw new Error("ServiceWorker registration failed");
      }
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      let response = await fetch("serviceworker-read");
      return await response.text();
    }

result, same first party: 
Error: navigator.serviceWorker is undefined,
Error: navigator.serviceWorker is undefined,
Error: navigator.serviceWorker is undefined

result, different first party: 
Error: navigator.serviceWorker is undefined,
Error: navigator.serviceWorker is undefined,
Error: navigator.serviceWorker is undefined

unsupported: true, true, true

passed: undefined

test failed: false, false, false
Passed
write: async (key) => {
      if (!navigator.serviceWorker) {
        throw new Error("Unsupported");
      }
      let registration = await navigator.serviceWorker.register(
        'serviceWorker.js');
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      await fetch(`serviceworker-write?secret=${key}`);
    }

read: async () => {
      console.log("trying to register the serviceworker now...");
      const registration = await Promise.race([
        navigator.serviceWorker.register('serviceWorker.js'),
        sleepMs(500)
      ]);
      if (registration === undefined) {
        // We timed out or otherwise failed.
        throw new Error("ServiceWorker registration failed");
      }
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      let response = await fetch("serviceworker-read");
      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 (key) => {
      if (!navigator.serviceWorker) {
        throw new Error("Unsupported");
      }
      let registration = await navigator.serviceWorker.register(
        'serviceWorker.js');
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      await fetch(`serviceworker-write?secret=${key}`);
    }

read: async () => {
      console.log("trying to register the serviceworker now...");
      const registration = await Promise.race([
        navigator.serviceWorker.register('serviceWorker.js'),
        sleepMs(500)
      ]);
      if (registration === undefined) {
        // We timed out or otherwise failed.
        throw new Error("ServiceWorker registration failed");
      }
      console.log(registration);
      await navigator.serviceWorker.ready;
      console.log("service worker ready");
      await sleepMs(100);
      let response = await fetch("serviceworker-read");
      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
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 {
        let worker = new 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 () => {
      let worker = new 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 (message === "none") {
        throw new Error("Unsupported");
      }
      return message;
    }

result, same first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

result, different first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

unsupported: true, true, true, true, true

passed: undefined

test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
      try {
        let worker = new 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 () => {
      let worker = new 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 (message === "none") {
        throw new Error("Unsupported");
      }
      return message;
    }

result, same first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

result, different first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

unsupported: true, true, true, true, true

passed: undefined

test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
      try {
        let worker = new 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 () => {
      let worker = new 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 (message === "none") {
        throw new Error("Unsupported");
      }
      return message;
    }

result, same first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

result, different first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

unsupported: true, true, true, true, true

passed: undefined

test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
      try {
        let worker = new 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 () => {
      let worker = new 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 (message === "none") {
        throw new Error("Unsupported");
      }
      return message;
    }

result, same first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

result, different first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

unsupported: true, true, true, true, true

passed: undefined

test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
      try {
        let worker = new 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 () => {
      let worker = new 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 (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: 
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
Unsupported
write: async (secret) => {
      try {
        let worker = new 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 () => {
      let worker = new 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 (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: 
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
Unsupported
write: async (secret) => {
      try {
        let worker = new 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 () => {
      let worker = new 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 (message === "none") {
        throw new Error("Unsupported");
      }
      return message;
    }

result, same first party: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

result, different first party: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

unsupported: true, true, true, true

passed: undefined

test failed: false, false, false, false
Unsupported
write: async (secret) => {
      try {
        let worker = new 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 () => {
      let worker = new 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 (message === "none") {
        throw new Error("Unsupported");
      }
      return message;
    }

result, same first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

result, different first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

unsupported: true, true, true, true, true

passed: undefined

test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
      try {
        let worker = new 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 () => {
      let worker = new 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 (message === "none") {
        throw new Error("Unsupported");
      }
      return message;
    }

result, same first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

result, different first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

unsupported: true, true, true, true, true

passed: undefined

test failed: false, false, false, false, false
Passed
write: async (secret) => {
      try {
        let worker = new 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 () => {
      let worker = new 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 (message === "none") {
        throw new Error("Unsupported");
      }
      return message;
    }

result, same first party: 
Error: no SharedWorker message received,
Error: no SharedWorker message received,
Error: no SharedWorker message received

result, different first party: 
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.

unsupported: false, false, false

passed: undefined

test failed: true, true, true
Unsupported
write: async (secret) => {
      try {
        let worker = new 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 () => {
      let worker = new 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 (message === "none") {
        throw new Error("Unsupported");
      }
      return message;
    }

result, same first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

result, different first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

unsupported: true, true, true, true, true

passed: undefined

test failed: false, false, false, false, false
Unsupported
write: async (secret) => {
      try {
        let worker = new 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 () => {
      let worker = new 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 (message === "none") {
        throw new Error("Unsupported");
      }
      return message;
    }

result, same first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

result, different first party: 
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined,
Error: SharedWorker is not defined

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 () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

read: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

result, same first party: 
3299e8d49aee6349844ab6489a6abd7e468a872b9d187aa18125c7a837915184,
556abe2779a96ac5c0820c30d2b945ea73b91293ea7fc540118b29b8db95a52f,
4995172d3fcc6492cec8983964ef796b6b31be7a795d9899632b845e9a062387,
08c58cda01dddfce2bab0ffa224f6cc10212d49a1aba5776e848e7784246d573,
0c8dbe01e4f927b1f3d98991cb809798365dff64d2a76bafbe412b1638a267f3

result, different first party: 
b1348f9a58a7bb93053cf6880cc7409e5e7a65741642f79d1cc7916ea73b5e35,
74676042e32d584c33fc926478ebbeb979ded619a8834ed19e58e76186f5e7c1,
1ff437e776bfe308e1090305159c8e3238cfc2cbd0a804ff89bcd2d250be85b3,
96e41b741e3b80ed48f24ca27ef2223063769809aa059c3d7cefd09de53e913d,
a35f94142a3b828526ccbec3a5746371d972f3950d0c1f3c55fdffc4b4398d2b

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

read: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

result, same first party: 
5a5a4460706ca9e2a66d8a6f5df3a191753a90d608008891f9f3342addd83b80,
cbd5e2864532b9a78ab0689ca41df824ec7af8d8a8969336d73e35413ff6bbba,
e87268a5e858bb6e825fc8a39548d01a1cd957e4dd16fa1668e44dd9cae13013,
6aa0be55028c3c8be5e9db8792af3ddeffa4512a2f005d4a57306c6b0b997b83,
3d36f50dc1850fdc753c76f977292bccd2d47e1d6208a7d212338727c40b6cc6

result, different first party: 
38bde5258bd2f8fc55d43dcd7e68926f1c3bddbe4230064e22fa0ce728bb047e,
8a19fed33cb1ee19fedac7ec3f4913210ae272699e2f3e1e4f3a0587b1f99e20,
f8e1aea628f33dbf8c92f5c924dc5793d6b9825b9f7cf7af71936f57eb1b9042,
6f739c357c6ced68a19f15943243998c03a87d647daeae63c2ef37016874310a,
2e5068cb6cce4f0062a0231af4520b6fc3d9a42fa0847a175fd977640c670087

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

read: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

result, same first party: 
17e57a147644afa6348e75c00dff4447d06517c4536eb23ffc698b261b648f26,
cf2d33692e92ca27b33943c973802c3dd41a20f079d349f197a7d7e442fa5cff,
5f8fc62fce3f56bb5aa1e236c3706953fa1a3774bf3be0e0263b61937790448d,
47ef8b6a85f8ab5d28bd285f18266a3a7093290b608c6d4daff3b61cc850e43d,
5a755879f1921690dee1c6c44aac140923dd09ed1cf127274418ecf958cb8a91

result, different first party: 
b65b282f6fc8a5f57cb1ff9fa7da47d661565d6d09abb51bd3c9755fa27e3e1c,
9fb15ce52dd9d514d7dc6418d836c84e47d75eca6e21b6df8d259ea7b540d057,
6cbacc8cf2a6c879b1257c71e04270f3cf403969ef098a51380cae2bb1f37a10,
ffa535fb0941646ed9deb17f88b0e10615b7c82d8dd6f6cb79422e9d0d953771,
cdb373d0b681e1adec90d4efab7289ba55a99f2aff0f7f0ec9a1a05d36d629cf

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

read: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

result, same first party: 
6e6e77bda285fb3e990452679ff1a7f44d35bd57bb5084e5d270d8bc3fa3415a,
c73b4d721f9128183c68b71caf8f1f04c9c82a70b817f0c12585fdd980b66aa1,
a2015966439287a5a8300518b559590179881006e8cfd8d056405fb4fad1dd23,
8bccfed9633d7bf886e976fadedf211c723045a6315f51361f96e8ef316362f3,
26cc31bc58b8ceecbde3de477454b428a0864a01c3814c9a43d5db23b009e190

result, different first party: 
f1ffa7e5059f47fc7323e147c811c4132f325f0e4ee70ae54c174018cf0352a9,
475bb641380a74c799cd7c8418ad1465f22df2390f9d5e03ed180689ae1d4356,
737350d948c55f96f92d904902c88dbf850eacc0846f64aeb004acaa96d16d45,
de1095bc47ea35c76159a7e9879516832155294913ea37e1faa3098f84c8e1ca,
8990dd614b12197a953152574c858c32ec48ef19e004ef031721b0edf636257d

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

read: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

result, same first party: 
7413eba309d43e144357a50ece4c571dcb2f26e5a22978332b21f45d8073a52c,
9dce4e1200bbaa9916599a3db5281b5232247ae7265bd1fc822b3154ff4e469e,
4847a662d87a6b27e9d4677734d62f60ee7f57a5a6e25a636f19d7fbf95a1cca,
50c8b6e48d391602d1a35578347fe389d8b2b83103645945305c3d9207a1d03f,
515d4ccd179f4b3b81a737b4c5d52eb98bb2c1b339527a4e634a57bedd26b823

result, different first party: 
904d943fc6650b354ce8414bd4ba0b07c7f9747ad5367379ea17a3acb1585a29,
f4324fd053b5bfd3cad25dba6c68703b6fd91e58272b6eaa98bf45812a158e88,
15a7b5538a6b7769ea0bb0bf0843883ce256e669dea94d4e43b39899de163471,
eebbc80571ceab8b9fa9888e1e9965ebf35cfbfc5add0315ac45020fe64bee5f,
46dbf761615426286b52cb0185b14c64b62ba59915c28562197cd19b9c1f63e6

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

read: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

result, same first party: 
bf353f9950cb935fcc3d89b7657ec9945c6b6ac131253d5f4dceb56a04373d79,
dbae4241cfa275ae283802cbe5079ad5d71cee07695b705f88146ffac8d84755,
b971c5b911a0dc660bcc6c58ec0b8130a23075b644bba95188b426afa8cb0cf2,
0b93736f5e068090a99e09e6582c2c841373187079ed042b7ee05a6f3b89ec32,
14881818f653fdfba4f850f1b0d1a46c851d718ee99e3d776509d7962880a143

result, different first party: 
8bd79db899ecbe6ace96b4e11d73ebf44cc413607d12fc8df3e8f60ba7b5e69d,
b0f980f01ec80a8d547933411944d240d0b3e4cb6cece2826e731f0fb172dad1,
f5617af273419a797238f4eab155507b2d00c1ee7c5d49cac59a00d6ad6d3fe4,
5536673085b6127c46b2c7aae8ae585c1cbc48c49bb709e5ff1d402c94d1051e,
77d7548ac2b6d543bcb27ba47aa6526a1fabeb4c9b9aa564031090c14acaf214

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

read: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

result, same first party: 
30e4c120bf243ae015ec6c7e6a969e51b2502981a73f5db2cdffdcefadc1eb76,
4cfc0c2b4b34f639b827f7e28834dbedfb1545a679ef35baa5c77425c2ae2534,
69d1ce9f84dac94da66d711b6f157f96de30e69dd17a826b6df8fdb4e4c46256,
d3ace3c4cb44adfb5f9aa093f121c402821794a94c8d0176247e9fc78172afdf

result, different first party: 
ba0aa65257286849db326b38a81a1c424477f18e68c7c7a128640319b1a74cbe,
bda1e143c5685e3e36b3fb761179f3e0022d4cd4f10b7aa8f45345dd8a46d010,
b4b4cccf590a95f25940605d4e725255a4722926665b6ed714032e0471d806cd,
a607957f4dbd42525ec843e42d50354f1253c14af732e4cb4f9b2653ba2a9652

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

read: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

result, same first party: 
94a508fd4bf9da505f3d5e69bca5d0505b84b58a4212cdd602f196dcfff56507,
83e7c7b7c3ea67b868c36d759a4b3be18ec3a62f2fc2e40439085148bd747022,
577a290a44725e69d5c653e1e5f7529e0287af982fae7df580523c956c7548e5,
f5e563ede7051f9baef693436e6237b2cecc6eb6bb852c2bc7fd24aee879df2b,
4a6e3e9e952092637b994213bcf31f8582c66eff8dff1b5be0dfd6cdb0005389

result, different first party: 
167035f23621df2716a0b9224e3c492bc340da4669a8874337b50a1556de6227,
68adc851055bf1a52a5ee28a66c78160c3b09e8d02f6a80fe94fd6aaea9cab24,
b43c8920ed5d5465755b11f3a073c31692427195e85c96af8cd6dc31184a1ec4,
710fa52a15026e866d22aaaf6c58a183808e92dd7006b17df228d769434af39d,
f8d9bcef8ed105d0b01b6610af1a6e424fd2fb138e478dcc9abce88d162794c4

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

read: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

result, same first party: 
4e686561fed50edcfe8f23fe6943581133936ad18c105879ce551d18c545c9bb,
fd02830ebd16d827044d61e867e37b399f61b577b8d859666eb20a4dba5e713d,
27bbf2c3c1f3a235bb75fd0be6ef3664796050f5b9b5f74a6a57864ccea58674,
edda5811186e34aaeea49d2bc428cfa5e1d549122de8263903908bdef2dc8bfd,
414e5e9c2e71bc96ad307e0b4b34141f4e404491bc3008c617bd5c2a03af0cef

result, different first party: 
76d386c53b4d3ec9dab45a710e79da64f01de24ec410fc5039c91c499af530f8,
fd2cccc23d56deed4ef0a4d1524cf81ffd649a07039a59aafd0c032ccc93dd9f,
07739bbe11ebad1ab77009c7e37df4aeb51f08f02a4b35d02859ece6abbfd42e,
26ab2a423f0156518996af8d31c75262d1fb2c4cc58d3edd48b6ebf0272f8650,
6a5a8849f398bd66649ac767304f913f8f840dfeca9ab8376ff9f7adf8a3dd2d

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

read: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

result, same first party: 
493d8539561950d574214f4f4516fc95a4611e0e8b5f11b604bc9f2e4ba31aa7,
1c7e017b8f8fb115702793f915d0b2343d1f0a30043830856ca9e7d89b9359fb,
af199da6fda83950dc010ab10fbe2ca1aa004e07eda6f8e6fd0c9a28b7736aae

result, different first party: 
0a347f1b033264e379737f103bb8b4b5425e4779e9ab563139de7093a27d1c16,
f9e251dd9692a075e123d9987c8101132d6a918c9314961d157596449be280eb,
5289d8c85e5a446f93b51fc83fdd2e232ba3fa568016e4f0a3a7a47a2d13f25e

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Passed
write: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

read: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

result, same first party: 
35bb94ea3b0f99ef9d9cba77a5d12091b73fa79ea9da266feb46a318b98ff8d0,
4cefd812a59d6c88e70d8ef13c8123018920b7452c6c90ac284be18b141ad810,
1388430403cce9b0356431f928029ec24e92171a8a3cd9f09b19e8b58b7508ab,
5725ee8df71223f8041b14826cc5c228413accf2c5da3a6eb02323bcf8e22e7d,
d05a83103bccf7116118fa00a35dcbc9c39c5b7934bb17200a4f14ec559e262c

result, different first party: 
c0fefa778ae1d7112a3906646134ff0847abfb5518da0d24da88c3a7abe75afd,
fe7e1ea226845aa7d703577373ecf6629fe50446d811efe6f51185a21599c22e,
b715b1cef5ca6a35c93c4ab9f095c2a0cb8bc0872fccce957b0466d2a0a0246d,
52350d51e5e19c6bbd7c9141dcbd7e03cd6f40c965df1d1faf1127207826a940,
50c821178544a7855355eed167c15809ca661d4d3b05c9b6d07b050acb48b624

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

read: async () => {
      let results = await fetch("https://tls.privacytests2.org:8900/");
      return (await results.json()).sessionId;
    }

result, same first party: 
0bf02722d9d698e3c58eb3befdd3c50ea093c65e8cb6f223fba64169d73ae607,
02422a761e20e08bbb7024a1bb65feeac1543af7604ebe86af3a94b84e58a485,
d83bd801fb766927ad8d6cfc31322d07b54ec0cb84f6839ea1523c7b5ed420af,
3227b9054605521024cbc8ce6fd6840405b5598ac856662f332ccc711acc6b10,
349f3a0df5ec630d8038eaf91fd4ca4221cc88cb723a5af3bc4f24c31671b72a

result, different first party: 
3c3db6f91da6ffb543f0a0be948d5bfe1936ce56f05537533f2d77fee147f31d,
4f58b406df505aa71036d9815f203907953484eceb1d5a8820bf104846f05929,
a16bc3aa921b4ec6f36858b4bc09946775ed268f5a1b8637657512b0fea1cf68,
9bba2c9e319d4ff80f10c06b40bdfcdf91cbb904385e14edca27b3196715ed59,
3688500b64238db90aa26dc0e0724f1bfdbde69b68ff35fc70c4e51c36153c67

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Web SQL Database
The Web SQL Database is a deprecated web API for storing data in an SQL database.
              
Passed
write: async (key) => {
      if (!window.openDatabase) {
        throw new Error("gported");
      }
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let tx = new Promise((resolve) => database.transaction(tx => {
        tx.executeSql(
          `CREATE TABLE IF NOT EXISTS cache(
             id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
             name TEXT NOT NULL,
             value TEXT NOT NULL,
             UNIQUE (name)
           )`,
          [], (tx, rs) => {}, (tx, err) => {});
        tx.executeSql(
          `INSERT OR REPLACE INTO cache(name, value)
           VALUES(?, ?)`,
          ["secret", key], (tx, rs) => {}, (tx, rs) => {});
      }));
    }

read: async () => {
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let result = await new Promise((resolve, reject) => database.transaction(tx => {
        tx.executeSql(
          "SELECT value FROM cache WHERE name=?",
          ["secret"],
          (tx, rs) => resolve(rs),
          (tx, err) => reject(err));
      }));
      return result.rows.item(0).value;
    }

result, same first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

result, different first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (!window.openDatabase) {
        throw new Error("gported");
      }
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let tx = new Promise((resolve) => database.transaction(tx => {
        tx.executeSql(
          `CREATE TABLE IF NOT EXISTS cache(
             id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
             name TEXT NOT NULL,
             value TEXT NOT NULL,
             UNIQUE (name)
           )`,
          [], (tx, rs) => {}, (tx, err) => {});
        tx.executeSql(
          `INSERT OR REPLACE INTO cache(name, value)
           VALUES(?, ?)`,
          ["secret", key], (tx, rs) => {}, (tx, rs) => {});
      }));
    }

read: async () => {
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let result = await new Promise((resolve, reject) => database.transaction(tx => {
        tx.executeSql(
          "SELECT value FROM cache WHERE name=?",
          ["secret"],
          (tx, rs) => resolve(rs),
          (tx, err) => reject(err));
      }));
      return result.rows.item(0).value;
    }

result, same first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

result, different first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (!window.openDatabase) {
        throw new Error("gported");
      }
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let tx = new Promise((resolve) => database.transaction(tx => {
        tx.executeSql(
          `CREATE TABLE IF NOT EXISTS cache(
             id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
             name TEXT NOT NULL,
             value TEXT NOT NULL,
             UNIQUE (name)
           )`,
          [], (tx, rs) => {}, (tx, err) => {});
        tx.executeSql(
          `INSERT OR REPLACE INTO cache(name, value)
           VALUES(?, ?)`,
          ["secret", key], (tx, rs) => {}, (tx, rs) => {});
      }));
    }

read: async () => {
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let result = await new Promise((resolve, reject) => database.transaction(tx => {
        tx.executeSql(
          "SELECT value FROM cache WHERE name=?",
          ["secret"],
          (tx, rs) => resolve(rs),
          (tx, err) => reject(err));
      }));
      return result.rows.item(0).value;
    }

result, same first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

result, different first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (!window.openDatabase) {
        throw new Error("gported");
      }
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let tx = new Promise((resolve) => database.transaction(tx => {
        tx.executeSql(
          `CREATE TABLE IF NOT EXISTS cache(
             id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
             name TEXT NOT NULL,
             value TEXT NOT NULL,
             UNIQUE (name)
           )`,
          [], (tx, rs) => {}, (tx, err) => {});
        tx.executeSql(
          `INSERT OR REPLACE INTO cache(name, value)
           VALUES(?, ?)`,
          ["secret", key], (tx, rs) => {}, (tx, rs) => {});
      }));
    }

read: async () => {
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let result = await new Promise((resolve, reject) => database.transaction(tx => {
        tx.executeSql(
          "SELECT value FROM cache WHERE name=?",
          ["secret"],
          (tx, rs) => resolve(rs),
          (tx, err) => reject(err));
      }));
      return result.rows.item(0).value;
    }

result, same first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

result, different first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (!window.openDatabase) {
        throw new Error("gported");
      }
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let tx = new Promise((resolve) => database.transaction(tx => {
        tx.executeSql(
          `CREATE TABLE IF NOT EXISTS cache(
             id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
             name TEXT NOT NULL,
             value TEXT NOT NULL,
             UNIQUE (name)
           )`,
          [], (tx, rs) => {}, (tx, err) => {});
        tx.executeSql(
          `INSERT OR REPLACE INTO cache(name, value)
           VALUES(?, ?)`,
          ["secret", key], (tx, rs) => {}, (tx, rs) => {});
      }));
    }

read: async () => {
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let result = await new Promise((resolve, reject) => database.transaction(tx => {
        tx.executeSql(
          "SELECT value FROM cache WHERE name=?",
          ["secret"],
          (tx, rs) => resolve(rs),
          (tx, err) => reject(err));
      }));
      return result.rows.item(0).value;
    }

result, same first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

result, different first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (!window.openDatabase) {
        throw new Error("gported");
      }
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let tx = new Promise((resolve) => database.transaction(tx => {
        tx.executeSql(
          `CREATE TABLE IF NOT EXISTS cache(
             id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
             name TEXT NOT NULL,
             value TEXT NOT NULL,
             UNIQUE (name)
           )`,
          [], (tx, rs) => {}, (tx, err) => {});
        tx.executeSql(
          `INSERT OR REPLACE INTO cache(name, value)
           VALUES(?, ?)`,
          ["secret", key], (tx, rs) => {}, (tx, rs) => {});
      }));
    }

read: async () => {
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let result = await new Promise((resolve, reject) => database.transaction(tx => {
        tx.executeSql(
          "SELECT value FROM cache WHERE name=?",
          ["secret"],
          (tx, rs) => resolve(rs),
          (tx, err) => reject(err));
      }));
      return result.rows.item(0).value;
    }

result, same first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

result, different first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (!window.openDatabase) {
        throw new Error("gported");
      }
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let tx = new Promise((resolve) => database.transaction(tx => {
        tx.executeSql(
          `CREATE TABLE IF NOT EXISTS cache(
             id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
             name TEXT NOT NULL,
             value TEXT NOT NULL,
             UNIQUE (name)
           )`,
          [], (tx, rs) => {}, (tx, err) => {});
        tx.executeSql(
          `INSERT OR REPLACE INTO cache(name, value)
           VALUES(?, ?)`,
          ["secret", key], (tx, rs) => {}, (tx, rs) => {});
      }));
    }

read: async () => {
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let result = await new Promise((resolve, reject) => database.transaction(tx => {
        tx.executeSql(
          "SELECT value FROM cache WHERE name=?",
          ["secret"],
          (tx, rs) => resolve(rs),
          (tx, err) => reject(err));
      }));
      return result.rows.item(0).value;
    }

result, same first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

result, different first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

unsupported: false, false, false, false

passed: undefined

test failed: true, true, true, true
Passed
write: async (key) => {
      if (!window.openDatabase) {
        throw new Error("gported");
      }
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let tx = new Promise((resolve) => database.transaction(tx => {
        tx.executeSql(
          `CREATE TABLE IF NOT EXISTS cache(
             id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
             name TEXT NOT NULL,
             value TEXT NOT NULL,
             UNIQUE (name)
           )`,
          [], (tx, rs) => {}, (tx, err) => {});
        tx.executeSql(
          `INSERT OR REPLACE INTO cache(name, value)
           VALUES(?, ?)`,
          ["secret", key], (tx, rs) => {}, (tx, rs) => {});
      }));
    }

read: async () => {
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let result = await new Promise((resolve, reject) => database.transaction(tx => {
        tx.executeSql(
          "SELECT value FROM cache WHERE name=?",
          ["secret"],
          (tx, rs) => resolve(rs),
          (tx, err) => reject(err));
      }));
      return result.rows.item(0).value;
    }

result, same first party: 
14e75fa4-a0d5-4431-9cba-1a4091496414,
d2c62f48-b023-4b69-9342-2c559c33e3e1,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71,
ab020566-d8a9-41af-aec5-58a457f3429a,
7d693c08-ae49-4855-88a9-ca684c95c567

result, different first party: 
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.,
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.,
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.,
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.,
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async (key) => {
      if (!window.openDatabase) {
        throw new Error("gported");
      }
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let tx = new Promise((resolve) => database.transaction(tx => {
        tx.executeSql(
          `CREATE TABLE IF NOT EXISTS cache(
             id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
             name TEXT NOT NULL,
             value TEXT NOT NULL,
             UNIQUE (name)
           )`,
          [], (tx, rs) => {}, (tx, err) => {});
        tx.executeSql(
          `INSERT OR REPLACE INTO cache(name, value)
           VALUES(?, ?)`,
          ["secret", key], (tx, rs) => {}, (tx, rs) => {});
      }));
    }

read: async () => {
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let result = await new Promise((resolve, reject) => database.transaction(tx => {
        tx.executeSql(
          "SELECT value FROM cache WHERE name=?",
          ["secret"],
          (tx, rs) => resolve(rs),
          (tx, err) => reject(err));
      }));
      return result.rows.item(0).value;
    }

result, same first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

result, different first party: 
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.,
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.,
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.,
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.,
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async (key) => {
      if (!window.openDatabase) {
        throw new Error("gported");
      }
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let tx = new Promise((resolve) => database.transaction(tx => {
        tx.executeSql(
          `CREATE TABLE IF NOT EXISTS cache(
             id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
             name TEXT NOT NULL,
             value TEXT NOT NULL,
             UNIQUE (name)
           )`,
          [], (tx, rs) => {}, (tx, err) => {});
        tx.executeSql(
          `INSERT OR REPLACE INTO cache(name, value)
           VALUES(?, ?)`,
          ["secret", key], (tx, rs) => {}, (tx, rs) => {});
      }));
    }

read: async () => {
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let result = await new Promise((resolve, reject) => database.transaction(tx => {
        tx.executeSql(
          "SELECT value FROM cache WHERE name=?",
          ["secret"],
          (tx, rs) => resolve(rs),
          (tx, err) => reject(err));
      }));
      return result.rows.item(0).value;
    }

result, same first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

result, different first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

unsupported: false, false, false

passed: undefined

test failed: true, true, true
Passed
write: async (key) => {
      if (!window.openDatabase) {
        throw new Error("gported");
      }
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let tx = new Promise((resolve) => database.transaction(tx => {
        tx.executeSql(
          `CREATE TABLE IF NOT EXISTS cache(
             id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
             name TEXT NOT NULL,
             value TEXT NOT NULL,
             UNIQUE (name)
           )`,
          [], (tx, rs) => {}, (tx, err) => {});
        tx.executeSql(
          `INSERT OR REPLACE INTO cache(name, value)
           VALUES(?, ?)`,
          ["secret", key], (tx, rs) => {}, (tx, rs) => {});
      }));
    }

read: async () => {
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let result = await new Promise((resolve, reject) => database.transaction(tx => {
        tx.executeSql(
          "SELECT value FROM cache WHERE name=?",
          ["secret"],
          (tx, rs) => resolve(rs),
          (tx, err) => reject(err));
      }));
      return result.rows.item(0).value;
    }

result, same first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

result, different first party: 
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function,
Error: window.openDatabase is not a function

unsupported: false, false, false, false, false

passed: undefined

test failed: true, true, true, true, true
Passed
write: async (key) => {
      if (!window.openDatabase) {
        throw new Error("gported");
      }
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let tx = new Promise((resolve) => database.transaction(tx => {
        tx.executeSql(
          `CREATE TABLE IF NOT EXISTS cache(
             id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
             name TEXT NOT NULL,
             value TEXT NOT NULL,
             UNIQUE (name)
           )`,
          [], (tx, rs) => {}, (tx, err) => {});
        tx.executeSql(
          `INSERT OR REPLACE INTO cache(name, value)
           VALUES(?, ?)`,
          ["secret", key], (tx, rs) => {}, (tx, rs) => {});
      }));
    }

read: async () => {
      let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024);
      let result = await new Promise((resolve, reject) => database.transaction(tx => {
        tx.executeSql(
          "SELECT value FROM cache WHERE name=?",
          ["secret"],
          (tx, rs) => resolve(rs),
          (tx, err) => reject(err));
      }));
      return result.rows.item(0).value;
    }

result, same first party: 
55443143-31e2-4079-87ff-2d3d1f51065a,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
736e1b37-65cf-48c4-82c4-eec3a005803b,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
2983da41-73b8-41fc-a719-30cc15f4f8f7

result, different first party: 
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.,
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.,
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.,
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.,
Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts.

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 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 XMLHttpRequest();
      const loadPromise = new Promise(resolve => req.addEventListener("load", resolve));
      req.open("GET", testURI("resource", "xhr", key));
      req.send();
      await loadPromise;
      let 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 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 XMLHttpRequest();
      const loadPromise = new Promise(resolve => req.addEventListener("load", resolve));
      req.open("GET", testURI("resource", "xhr", key));
      req.send();
      await loadPromise;
      let 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
Failed
write: async (key) => {
      const req = new 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 XMLHttpRequest();
      const loadPromise = new Promise(resolve => req.addEventListener("load", resolve));
      req.open("GET", testURI("resource", "xhr", key));
      req.send();
      await loadPromise;
      let 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: 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 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 XMLHttpRequest();
      const loadPromise = new Promise(resolve => req.addEventListener("load", resolve));
      req.open("GET", testURI("resource", "xhr", key));
      req.send();
      await loadPromise;
      let 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 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 XMLHttpRequest();
      const loadPromise = new Promise(resolve => req.addEventListener("load", resolve));
      req.open("GET", testURI("resource", "xhr", key));
      req.send();
      await loadPromise;
      let 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 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 XMLHttpRequest();
      const loadPromise = new Promise(resolve => req.addEventListener("load", resolve));
      req.open("GET", testURI("resource", "xhr", key));
      req.send();
      await loadPromise;
      let 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 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 XMLHttpRequest();
      const loadPromise = new Promise(resolve => req.addEventListener("load", resolve));
      req.open("GET", testURI("resource", "xhr", key));
      req.send();
      await loadPromise;
      let countResponse = await fetch(testURI("ctr", "xhr", key),
                                      {cache: "reload"});
      return (await countResponse.text()).trim();
    }

result, same first party: 1, 1, 1, 1

result, different first party: 2, 2, 2, 2

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: async (key) => {
      const req = new 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 XMLHttpRequest();
      const loadPromise = new Promise(resolve => req.addEventListener("load", resolve));
      req.open("GET", testURI("resource", "xhr", key));
      req.send();
      await loadPromise;
      let 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 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 XMLHttpRequest();
      const loadPromise = new Promise(resolve => req.addEventListener("load", resolve));
      req.open("GET", testURI("resource", "xhr", key));
      req.send();
      await loadPromise;
      let 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 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 XMLHttpRequest();
      const loadPromise = new Promise(resolve => req.addEventListener("load", resolve));
      req.open("GET", testURI("resource", "xhr", key));
      req.send();
      await loadPromise;
      let countResponse = await fetch(testURI("ctr", "xhr", key),
                                      {cache: "reload"});
      return (await countResponse.text()).trim();
    }

result, same first party: 1, 1, 1

result, different first party: 2, 2, 2

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Passed
write: async (key) => {
      const req = new 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 XMLHttpRequest();
      const loadPromise = new Promise(resolve => req.addEventListener("load", resolve));
      req.open("GET", testURI("resource", "xhr", key));
      req.send();
      await loadPromise;
      let 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 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 XMLHttpRequest();
      const loadPromise = new Promise(resolve => req.addEventListener("load", resolve));
      req.open("GET", testURI("resource", "xhr", key));
      req.send();
      await loadPromise;
      let 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
Passed
write: (secret) => { /* do nothing */ }

read: () => document.referrer

result, same first party: 
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/

result, different first party: , , , 

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Failed
write: (secret) => { /* do nothing */ }

read: () => document.referrer

result, same first party: 
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/

result, different first party: 
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Failed
write: (secret) => { /* do nothing */ }

read: () => document.referrer

result, same first party: 
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/

result, different first party: 
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Failed
write: (secret) => { /* do nothing */ }

read: () => document.referrer

result, same first party: 
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/

result, different first party: 
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/

unsupported: false, false, false

passed: false, false, false

test failed: false, false, false
Failed
write: (secret) => { /* do nothing */ }

read: () => document.referrer

result, same first party: 
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/

result, different first party: 
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Failed
write: (secret) => { /* do nothing */ }

read: () => document.referrer

result, same first party: 
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/

result, different first party: 
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/,
https://test-pages.privacytests2.org/

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
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) => sessionStorage.setItem("secret", secret)

read: () => sessionStorage.getItem("secret")

result, same first party: 
7458e015-b20f-4696-982b-aff57b0a74d4,
233e87ca-b8aa-436e-b680-817d86c6acc6,
93c14173-842d-44ed-a4ff-63e04b54c399,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058,
0fffef3e-f7ec-4b63-96e1-3579877405b9

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) => sessionStorage.setItem("secret", secret)

read: () => sessionStorage.getItem("secret")

result, same first party: 
a532c74b-ccca-4515-a333-acc0a246685e,
101607a1-97bb-463f-a9d1-90092abd8d32,
8db0833d-7b52-46e6-b332-55ab54a0a865,
a349e1c6-758d-4877-aabd-0c7631135118,
d64967c1-e520-4790-8fb7-45ad567e909b

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (secret) => sessionStorage.setItem("secret", secret)

read: () => sessionStorage.getItem("secret")

result, same first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
03b9d753-12c6-4473-b06d-b8373a015a62,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
04fae689-670b-4d64-9966-eb064fc485e2

result, different first party: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
03b9d753-12c6-4473-b06d-b8373a015a62,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
04fae689-670b-4d64-9966-eb064fc485e2

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: (secret) => sessionStorage.setItem("secret", secret)

read: () => sessionStorage.getItem("secret")

result, same first party: 
e8304637-cd9b-4058-bcea-626aab9e6c48,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b,
358302cc-de3c-4795-9b0b-887befc03092,
4baa56df-63a7-4df0-ae5c-40889f396f9b,
e1def859-9956-483d-a3e7-968b58011edd

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) => sessionStorage.setItem("secret", secret)

read: () => sessionStorage.getItem("secret")

result, same first party: 
1493eeef-c081-44cb-8d2a-f4ab9af6a92e,
16ced892-e431-42ab-9017-da51b0a252c4,
b123e636-13a4-400d-9ee2-2c169a0139aa,
c697e0c1-9995-42a9-ba16-79646dbb7080,
5bf95fd8-3c2f-45c7-8f72-f3d86b122801

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) => sessionStorage.setItem("secret", secret)

read: () => sessionStorage.getItem("secret")

result, same first party: 
9c2e169f-8427-4aef-a5d9-aae49dd17a75,
93048464-dce7-4a11-bd17-e6d2a9f351ae,
a0218bc8-aa46-4824-814a-e196a157d9ba,
8bb72ef9-2ce9-4c9b-8cc4-3ada65a3c885,
7dcd2a99-0b83-48d4-8de2-36ea2e2e15fa

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) => sessionStorage.setItem("secret", secret)

read: () => sessionStorage.getItem("secret")

result, same first party: 
c0c1c677-f40a-4384-a88c-e68592da8028,
8611fa70-4e3c-419c-bf1c-14efadf3bf65,
c9d39f37-3482-42a2-8c78-eae8ac064794,
dfcafb86-c9a6-4426-adf1-7e4f52e6c84e

result, different first party: , , , 

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Passed
write: (secret) => sessionStorage.setItem("secret", secret)

read: () => sessionStorage.getItem("secret")

result, same first party: 
14e75fa4-a0d5-4431-9cba-1a4091496414,
d2c62f48-b023-4b69-9342-2c559c33e3e1,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71,
ab020566-d8a9-41af-aec5-58a457f3429a,
7d693c08-ae49-4855-88a9-ca684c95c567

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (secret) => sessionStorage.setItem("secret", secret)

read: () => sessionStorage.getItem("secret")

result, same first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

result, different first party: 
f3f67746-9960-4b78-baa7-a6efe6ca4476,
eb0669e8-a477-4269-b334-0f6368e23739,
309203c0-e03c-48c7-8048-dff552ec9f26,
e390a75c-c1da-4107-b6ea-2796a43ee590,
2274f6cd-be7d-4901-8463-5dbcfd05cce5

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: (secret) => sessionStorage.setItem("secret", secret)

read: () => sessionStorage.getItem("secret")

result, same first party: 
05da0cf3-c3f1-456e-9131-51fd4bb8933d,
e12f334e-76b0-4ebc-aa46-96e6aa14c022,
39960fb8-e89f-4bf8-99a2-136a8909aa1c

result, different first party: , , 

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Passed
write: (secret) => sessionStorage.setItem("secret", secret)

read: () => sessionStorage.getItem("secret")

result, same first party: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c,
1407c508-f609-441d-9532-18e2ab87cff2,
983896b9-fb6d-4759-a274-c1e36cfa3a67,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (secret) => sessionStorage.setItem("secret", secret)

read: () => sessionStorage.getItem("secret")

result, same first party: 
55443143-31e2-4079-87ff-2d3d1f51065a,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
736e1b37-65cf-48c4-82c4-eec3a005803b,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
2983da41-73b8-41fc-a719-30cc15f4f8f7

result, different first party: 
55443143-31e2-4079-87ff-2d3d1f51065a,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
736e1b37-65cf-48c4-82c4-eec3a005803b,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
2983da41-73b8-41fc-a719-30cc15f4f8f7

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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_7458e015-b20f-4696-982b-aff57b0a74d4,
name_233e87ca-b8aa-436e-b680-817d86c6acc6,
name_93c14173-842d-44ed-a4ff-63e04b54c399,
name_b48bd424-7e5d-41b9-ac0e-f1e1a93ff058,
name_0fffef3e-f7ec-4b63-96e1-3579877405b9

result, different first party: , , , , 

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: (secret) => window.name = "name_" + secret

read: () => window.name

result, same first party: 
name_a532c74b-ccca-4515-a333-acc0a246685e,
name_101607a1-97bb-463f-a9d1-90092abd8d32,
name_8db0833d-7b52-46e6-b332-55ab54a0a865,
name_a349e1c6-758d-4877-aabd-0c7631135118,
name_d64967c1-e520-4790-8fb7-45ad567e909b

result, different first party: 
name_a532c74b-ccca-4515-a333-acc0a246685e,
name_101607a1-97bb-463f-a9d1-90092abd8d32,
name_8db0833d-7b52-46e6-b332-55ab54a0a865,
name_a349e1c6-758d-4877-aabd-0c7631135118,
name_d64967c1-e520-4790-8fb7-45ad567e909b

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Failed
write: (secret) => window.name = "name_" + secret

read: () => window.name

result, same first party: 
name_c581f98f-a8e3-43f4-ba48-76baf25afe1b,
name_a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
name_03b9d753-12c6-4473-b06d-b8373a015a62,
name_3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
name_04fae689-670b-4d64-9966-eb064fc485e2

result, different first party: 
name_c581f98f-a8e3-43f4-ba48-76baf25afe1b,
name_a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2,
name_03b9d753-12c6-4473-b06d-b8373a015a62,
name_3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f,
name_04fae689-670b-4d64-9966-eb064fc485e2

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Failed
write: (secret) => window.name = "name_" + secret

read: () => window.name

result, same first party: 
name_e8304637-cd9b-4058-bcea-626aab9e6c48,
name_25fd7847-2aba-4201-8b3e-31c5cbb4b53b,
name_358302cc-de3c-4795-9b0b-887befc03092,
name_4baa56df-63a7-4df0-ae5c-40889f396f9b,
name_e1def859-9956-483d-a3e7-968b58011edd

result, different first party: 
name_e8304637-cd9b-4058-bcea-626aab9e6c48,
name_25fd7847-2aba-4201-8b3e-31c5cbb4b53b,
name_358302cc-de3c-4795-9b0b-887befc03092,
name_4baa56df-63a7-4df0-ae5c-40889f396f9b,
name_e1def859-9956-483d-a3e7-968b58011edd

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: (secret) => window.name = "name_" + secret

read: () => window.name

result, same first party: 
name_1493eeef-c081-44cb-8d2a-f4ab9af6a92e,
name_16ced892-e431-42ab-9017-da51b0a252c4,
name_b123e636-13a4-400d-9ee2-2c169a0139aa,
name_c697e0c1-9995-42a9-ba16-79646dbb7080,
name_5bf95fd8-3c2f-45c7-8f72-f3d86b122801

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_9c2e169f-8427-4aef-a5d9-aae49dd17a75,
name_93048464-dce7-4a11-bd17-e6d2a9f351ae,
name_a0218bc8-aa46-4824-814a-e196a157d9ba,
name_8bb72ef9-2ce9-4c9b-8cc4-3ada65a3c885,
name_7dcd2a99-0b83-48d4-8de2-36ea2e2e15fa

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_c0c1c677-f40a-4384-a88c-e68592da8028,
name_8611fa70-4e3c-419c-bf1c-14efadf3bf65,
name_c9d39f37-3482-42a2-8c78-eae8ac064794,
name_dfcafb86-c9a6-4426-adf1-7e4f52e6c84e

result, different first party: , , , 

unsupported: false, false, false, false

passed: true, true, true, true

test failed: false, false, false, false
Failed
write: (secret) => window.name = "name_" + secret

read: () => window.name

result, same first party: 
name_14e75fa4-a0d5-4431-9cba-1a4091496414,
name_d2c62f48-b023-4b69-9342-2c559c33e3e1,
name_6faac091-a8fe-48b8-8ab1-54e8aa7ddb71,
name_ab020566-d8a9-41af-aec5-58a457f3429a,
name_7d693c08-ae49-4855-88a9-ca684c95c567

result, different first party: 
name_14e75fa4-a0d5-4431-9cba-1a4091496414,
name_d2c62f48-b023-4b69-9342-2c559c33e3e1,
name_6faac091-a8fe-48b8-8ab1-54e8aa7ddb71,
name_ab020566-d8a9-41af-aec5-58a457f3429a,
name_7d693c08-ae49-4855-88a9-ca684c95c567

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: (secret) => window.name = "name_" + secret

read: () => window.name

result, same first party: 
name_f3f67746-9960-4b78-baa7-a6efe6ca4476,
name_eb0669e8-a477-4269-b334-0f6368e23739,
name_309203c0-e03c-48c7-8048-dff552ec9f26,
name_e390a75c-c1da-4107-b6ea-2796a43ee590,
name_2274f6cd-be7d-4901-8463-5dbcfd05cce5

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_05da0cf3-c3f1-456e-9131-51fd4bb8933d,
name_e12f334e-76b0-4ebc-aa46-96e6aa14c022,
name_39960fb8-e89f-4bf8-99a2-136a8909aa1c

result, different first party: , , 

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Failed
write: (secret) => window.name = "name_" + secret

read: () => window.name

result, same first party: 
name_8f42f99b-b62f-4b5b-b8f6-c9c84aece09c,
name_1407c508-f609-441d-9532-18e2ab87cff2,
name_983896b9-fb6d-4759-a274-c1e36cfa3a67,
name_0ebe06e1-a40d-479f-ac13-7529f25a3dbb,
name_64f2a49c-44ec-472c-bf2f-878f8a27d3a7

result, different first party: 
name_8f42f99b-b62f-4b5b-b8f6-c9c84aece09c,
name_1407c508-f609-441d-9532-18e2ab87cff2,
name_983896b9-fb6d-4759-a274-c1e36cfa3a67,
name_0ebe06e1-a40d-479f-ac13-7529f25a3dbb,
name_64f2a49c-44ec-472c-bf2f-878f8a27d3a7

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Failed
write: (secret) => window.name = "name_" + secret

read: () => window.name

result, same first party: 
name_55443143-31e2-4079-87ff-2d3d1f51065a,
name_4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
name_736e1b37-65cf-48c4-82c4-eec3a005803b,
name_df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
name_2983da41-73b8-41fc-a719-30cc15f4f8f7

result, different first party: 
name_55443143-31e2-4079-87ff-2d3d1f51065a,
name_4a4d8aa3-d9aa-424a-a773-2275066ce9a5,
name_736e1b37-65cf-48c4-82c4-eec3a005803b,
name_df1b8dcf-8374-40c9-af1b-aa3d2538bcda,
name_2983da41-73b8-41fc-a719-30cc15f4f8f7

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
HTTPS testsWhich browsers prevent unencrypted network connections?
HTTPS is the protocol that web browsers use to connect securely to websites. When HTTPS is being used, the connection is encrypted so that third parties on the network cannot read content being sent between the server and your browser. In the past, insecure connections were the default and websites would need to actively request that a browser use HTTPS. Now the status quo is shifting, and browser makers are moving toward a world where HTTPS is the default protocol.`
        
Insecure website warning
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
Passed
passed: true,true,true,true,true
result: Insecure website never loaded,Insecure website never loaded,Insecure website never loaded,Insecure website never loaded,Insecure website never loaded
Passed
passed: true,true,true,true
result: Insecure website never loaded,Insecure website never loaded,Insecure website never loaded,Insecure website never loaded
Failed
passed: false,false,false,false,false
result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
Failed
passed: false,false,false,false,false
result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
Passed
passed: true,true,true
result: Insecure website never loaded,Insecure website never loaded,Insecure website never loaded
Failed
passed: false,false,false,false,false
result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
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
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
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
Passed
upgraded: true,true,true,true,true
passed: true,true,true,true,true
Passed
upgraded: true,true,true,true
passed: 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
Passed
upgraded: true,true,true
passed: true,true,true
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 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
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
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
Passed
upgraded: true,true,true,true,true
passed: true,true,true,true,true
Passed
upgraded: true,true,true,true
passed: true,true,true,true
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
Passed
upgraded: true,true,true
passed: true,true,true
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
Failed
passed: false,false,false,false,false
result: loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely
Passed
passed: true,true,true,true,true
result: upgraded,upgraded,upgraded,upgraded,upgraded
Failed
passed: false,false,false,false,false
result: loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely
Passed
passed: true,true,true,true,true
result: upgraded,upgraded,upgraded,upgraded,upgraded
Passed
passed: true,true,true,true
result: upgraded,upgraded,upgraded,upgraded
Passed
passed: true,true,true,true,true
result: upgraded,upgraded,upgraded,upgraded,upgraded
Passed
passed: true,true,true,true,true
result: upgraded,upgraded,upgraded,upgraded,upgraded
Passed
passed: true,true,true
result: upgraded,upgraded,upgraded
Passed
passed: true,true,true,true,true
result: upgraded,upgraded,upgraded,upgraded,upgraded
Passed
passed: true,true,true,true,true
result: upgraded,upgraded,upgraded,upgraded,upgraded
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: upgraded,upgraded,upgraded,upgraded,upgraded
Passed
passed: true,true,true,true
result: upgraded,upgraded,upgraded,upgraded
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
result: upgraded,upgraded,upgraded
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.
              
Passed
SNI_status: encrypted
passed: true,true,true,true,true
Passed
SNI_status: encrypted
passed: true,true,true,true,true
Failed
SNI_status: plaintext
passed: false,false,false,false,false
Passed
SNI_status: encrypted
passed: true,true,true,true,true
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
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
Passed
SNI_status: encrypted
passed: true,true,true,true,true
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.
              
Passed
header value: 1
passed: true,true,true,true,true
Failed
header value: undefined
passed: false,false,false,false,false
Passed
header value: 1
passed: true,true,true,true,true
Failed
header value: undefined
passed: false,false,false,false,false
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
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
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.
              
Passed
sec-gpc: 1
passed: true,true,true,true,true
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
Failed
passed: false,false,false,false,false
Failed
passed: false,false,false,false,false
Failed
passed: false,false,false
Failed
passed: false,false,false,false,false
Failed
passed: false,false,false,false,false
IP address leak
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
Failed
passed: false,false,false,false,false
Failed
passed: false,false,false,false,false
Passed
passed: true,true,true
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
readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported
readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported
testFailed: 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
Passed
write: () => {
      if (!usingTor) {
        throw new Error("Unsupported");
      }
    }
read: async () => {
      if (usingTor) {
        return ipAddress;
      } else {
        throw new Error("Unsupported");
      }
    }
unsupported: false,false,false
readSameFirstParty: 2a0b:f4c2::23,2001:67c:6ec:203:192:42:116:186,2a0b:f4c0:16c:15::1
readDifferentFirstParty: 2001:67c:6ec:203:192:42:116:186,2a0b:f4c2:2::32,2605:6400:d814:5125::
passed: true,true,true
testFailed: false,false,false
Unsupported
write: () => {
      if (!usingTor) {
        throw new Error("Unsupported");
      }
    }
read: async () => {
      if (usingTor) {
        return ipAddress;
      } else {
        throw new Error("Unsupported");
      }
    }
unsupported: true,true,true,true,true
readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported
readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported
testFailed: false,false,false,false,false
Unsupported
write: () => {
      if (!usingTor) {
        throw new Error("Unsupported");
      }
    }
read: async () => {
      if (usingTor) {
        return ipAddress;
      } else {
        throw new Error("Unsupported");
      }
    }
unsupported: true,true,true,true,true
readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported
readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported
testFailed: false,false,false,false,false
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
passed: 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
Passed
IsTorExit: true,true,true
passed: true,true,true
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
Fingerprinting resistance testsWhich browsers hide what's unique about your device?
Fingerprinting is a technique trackers use to uniquely identify you as you browse the web. A fingerprinting script will measure several characteristics of your browser and, combining this data, will build a fingerprint that may uniquely identify you among web users. Browsers can introduce countermeasures, such as minimizing the distinguishing information disclosed by certain web APIs so your browser is harder to pick out from the crowd (so-called 'fingerprinting resistance').`,
        
Media query screen height
Height of the user's screen in pixels.
              
Failed
expression: undefined
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: true,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: undefined
desired value: undefined
passed: false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: undefined
desired value: undefined
passed: false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 800,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Media query screen width
Width of the user's screen in pixels.
              
Failed
expression: undefined
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Passed
expression: undefined
desired expression: undefined
actual value: 980,980,980,980
desired value: undefined
passed: true,true,true,true
Failed
expression: undefined
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Passed
expression: undefined
desired expression: undefined
actual value: 980,980,980
desired value: undefined
passed: true,true,true
Failed
expression: undefined
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: undefined
desired expression: undefined
actual value: 360,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
outerHeight
Height of the browser window in pixels, including browser chrome.
              
Failed
expression: outerHeight
desired expression: undefined
actual value: 280,622,622,622,622
desired value: undefined
passed: false,false,false,false,false
Failed
expression: outerHeight
desired expression: undefined
actual value: 280,670,670,670,670
desired value: undefined
passed: false,false,false,false,false
Failed
expression: outerHeight
desired expression: undefined
actual value: 280,670,670,670,670
desired value: undefined
passed: false,false,false,false,false
Failed
expression: outerHeight
desired expression: undefined
actual value: 284,622,622,622,622
desired value: undefined
passed: false,false,false,false,false
Failed
expression: outerHeight
desired expression: undefined
actual value: 336,725,725,725,725
desired value: undefined
passed: false,false,false,false,false
Failed
expression: outerHeight
desired expression: undefined
actual value: 336,725,725,725,725
desired value: undefined
passed: false,false,false,false,false
Passed
expression: outerHeight
desired expression: undefined
actual value: 1822,1822,1822,1822
desired value: undefined
passed: true,true,true,true
Failed
expression: outerHeight
desired expression: undefined
actual value: 224,614,614,614,614
desired value: undefined
passed: false,false,false,false,false
Failed
expression: outerHeight
desired expression: undefined
actual value: 312,630,630,630,630
desired value: undefined
passed: false,false,false,false,false
Passed
expression: outerHeight
desired expression: undefined
actual value: 1822,1822,1822
desired value: undefined
passed: true,true,true
Failed
expression: outerHeight
desired expression: undefined
actual value: 240,582,582,582,582
desired value: undefined
passed: false,false,false,false,false
Failed
expression: outerHeight
desired expression: undefined
actual value: 618,618,618,618,618
desired value: undefined
passed: false,false,false,false,false
screen.height
Height of the user's screen, in pixels.
              
Failed
expression: screen.height
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.height
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.height
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.height
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.height
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.height
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: true,false,false,false,false
Passed
expression: screen.height
desired expression: undefined
actual value: 1822,1822,1822,1822
desired value: undefined
passed: true,true,true,true
Failed
expression: screen.height
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.height
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Passed
expression: screen.height
desired expression: undefined
actual value: 1822,1822,1822
desired value: undefined
passed: true,true,true
Failed
expression: screen.height
desired expression: undefined
actual value: 360,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.height
desired expression: undefined
actual value: 800,800,800,800,800
desired value: undefined
passed: false,false,false,false,false
screen.width
Width of the user's screen, in pixels.
              
Failed
expression: screen.width
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.width
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.width
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.width
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.width
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.width
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Passed
expression: screen.width
desired expression: undefined
actual value: 980,980,980,980
desired value: undefined
passed: true,true,true,true
Failed
expression: screen.width
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.width
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Passed
expression: screen.width
desired expression: undefined
actual value: 980,980,980
desired value: undefined
passed: true,true,true
Failed
expression: screen.width
desired expression: undefined
actual value: 800,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screen.width
desired expression: undefined
actual value: 360,360,360,360,360
desired value: undefined
passed: false,false,false,false,false
screenX
Position, in pixels, of the left edge of the browser window on screen.
              
Passed
expression: screenX
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Passed
expression: screenX
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Passed
expression: screenX
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Passed
expression: screenX
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Failed
expression: screenX
desired expression: undefined
actual value: 48,0,0,0,0
desired value: undefined
passed: false,true,true,true,true
Failed
expression: screenX
desired expression: undefined
actual value: 48,0,0,0,0
desired value: undefined
passed: false,true,true,true,true
Passed
expression: screenX
desired expression: undefined
actual value: 0,0,0,0
desired value: undefined
passed: true,true,true,true
Passed
expression: screenX
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Passed
expression: screenX
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Passed
expression: screenX
desired expression: undefined
actual value: 0,0,0
desired value: undefined
passed: true,true,true
Passed
expression: screenX
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Passed
expression: screenX
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
screenY
Position, in pixels, of the top edge of the browser window on screen.
              
Passed
expression: screenY
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Passed
expression: screenY
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Passed
expression: screenY
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Passed
expression: screenY
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Failed
expression: screenY
desired expression: undefined
actual value: 80,83,83,83,83
desired value: undefined
passed: false,false,false,false,false
Failed
expression: screenY
desired expression: undefined
actual value: 80,83,83,83,83
desired value: undefined
passed: false,false,false,false,false
Passed
expression: screenY
desired expression: undefined
actual value: 0,0,0,0
desired value: undefined
passed: true,true,true,true
Passed
expression: screenY
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Passed
expression: screenY
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Passed
expression: screenY
desired expression: undefined
actual value: 0,0,0
desired value: undefined
passed: true,true,true
Passed
expression: screenY
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
Passed
expression: screenY
desired expression: undefined
actual value: 0,0,0,0,0
desired value: undefined
passed: true,true,true,true,true
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: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
__hssc
HubSpot tracking parameter
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
__hstc
HubSpot tracking parameter
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
__s
Drip.com email address tracking parameter
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
_hsenc
HubSpot tracking parameter
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
_openstat
Yandex tracking parameter
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
dclid
DoubleClick Click ID (Google)
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
fbclid
Facebook Click Identifier
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
gclid
Google Click Identifier
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
hsCtaTracking
HubSpot tracking parameter
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
mc_eid
Mailchimp Email ID (email recipient's address)
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
mkt_tok
Adobe Marketo tracking parameter
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
ml_subscriber
MailerLite email tracking
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
ml_subscriber_hash
MailerLite email tracking
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
msclkid
Microsoft Click ID
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
oly_anon_id
Omeda marketing 'anonymous' customer id
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
oly_enc_id
Omeda marketing 'known' customer id
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
rb_clickid
Unknown high-entropy tracking parameter
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
s_cid
Adobe Site Catalyst tracking parameter
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
vero_conv
Vero tracking parameter
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
vero_id
Vero tracking parameter
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
wickedid
Wicked Reports e-commerce tracking
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
yclid
Yandex Click ID
              
Passed
passed: true,true,true,true,true
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 3196850088960117
passed: false,false,false
Failed
value: 6220409046356266
passed: false,false,false,false,false
Failed
value: 6220409046356266
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,false,false,false,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,false,false,false,false
Failed
url: https://munchkin.marketo.net/munchkin.js
passed: false,false,false,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: true,true,true,true
Failed
url: https://munchkin.marketo.net/munchkin.js
passed: false,false,false,false,false
Failed
url: https://munchkin.marketo.net/munchkin.js
passed: false,false,false,false,false
Failed
url: https://munchkin.marketo.net/munchkin.js
passed: false,false,false
Failed
url: https://munchkin.marketo.net/munchkin.js
passed: false,false,false,false,false
Failed
url: https://munchkin.marketo.net/munchkin.js
passed: false,false,false,false,false
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
Passed
url: https://dpm.demdex.net/ibs
passed: 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
Failed
url: https://dpm.demdex.net/ibs
passed: false,false,false
Failed
url: https://dpm.demdex.net/ibs
passed: false,false,false,false,false
Failed
url: https://dpm.demdex.net/ibs
passed: false,false,false,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
Passed
url: https://s.amazon-adsystem.com/dcm
passed: true,true,true,true
Passed
url: https://s.amazon-adsystem.com/dcm
passed: true,true,true,true,true
Failed
url: https://s.amazon-adsystem.com/dcm
passed: false,false,false,false,false
Failed
url: https://s.amazon-adsystem.com/dcm
passed: false,false,false
Failed
url: https://s.amazon-adsystem.com/dcm
passed: false,false,false,false,false
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
Passed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: true,true,true,true
Passed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: true,true,true,true,true
Failed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: false,false,false,false,false
Failed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: false,false,false
Failed
url: https://ib.adnxs.com/px?id=178248&t=1
passed: false,false,false,false,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
passed: true,true,true,true,true
Passed
url: https://bat.bing.com/bat.js
passed: 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
Failed
url: https://bat.bing.com/bat.js
passed: false,false,false
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
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
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
Passed
url: https://static.chartbeat.com/js/chartbeat.js
passed: true,true,true,true,true
Passed
url: https://static.chartbeat.com/js/chartbeat.js
passed: 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
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
Passed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: 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
Failed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: false,false,false
Failed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: false,false,false,false,false
Failed
url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
passed: false,false,false,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
Failed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: false,false,false,false,false
Passed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: true,true,true,true,true
Failed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: false,false,false,false,false
Failed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: false,false,false,false,false
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: true,true,true,true
Passed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: true,true,true,true,true
Failed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: false,false,false,false,false
Failed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: false,false,false
Failed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: false,false,false,false,false
Failed
url: https://securepubads.g.doubleclick.net/static/glade.js
passed: false,false,false,false,false
Facebook tracking
Tests whether the browser blocks the page from loading the tracker at https://connect.facebook.net/en_US/fbevents.js
              
Passed
url: https://connect.facebook.net/en_US/fbevents.js
passed: true,true,true,true,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
Passed
url: https://connect.facebook.net/en_US/fbevents.js
passed: true,true,true,true
Failed
url: https://connect.facebook.net/en_US/fbevents.js
passed: false,false,false,false,false
Failed
url: https://connect.facebook.net/en_US/fbevents.js
passed: false,false,false,false,false
Failed
url: https://connect.facebook.net/en_US/fbevents.js
passed: false,false,false
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
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: false,false,false,false,false
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,false,false,false,false
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: false,false,false,false,false
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: false,false,false,false,false
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: false,false,false,false
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: false,false,false,false,false
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: false,false,false,false,false
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: false,false,false
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: false,false,false,false,false
Failed
url: https://www.google.com/pagead/1p-user-list/
passed: false,false,false,false,false
Google Analytics
Tests whether the browser blocks the page from loading the tracker at https://google-analytics.com/urchin.js
              
Passed
url: https://google-analytics.com/urchin.js
passed: true,true,true,true,true
Failed
url: https://google-analytics.com/urchin.js
passed: false,false,false,false,false
Passed
url: https://google-analytics.com/urchin.js
passed: true,true,true,true,true
Failed
url: https://google-analytics.com/urchin.js
passed: false,false,false,false,false
Failed
url: https://google-analytics.com/urchin.js
passed: false,false,false,false,false
Passed
url: https://google-analytics.com/urchin.js
passed: true,true,true,true,true
Passed
url: https://google-analytics.com/urchin.js
passed: true,true,true,true
Failed
url: https://google-analytics.com/urchin.js
passed: false,false,false,false,false
Failed
url: https://google-analytics.com/urchin.js
passed: false,false,false,false,false
Failed
url: https://google-analytics.com/urchin.js
passed: false,false,false
Failed
url: https://google-analytics.com/urchin.js
passed: false,false,false,false,false
Failed
url: https://google-analytics.com/urchin.js
passed: false,false,false,false,false
Google Tag Manager
Tests whether the browser blocks the page from loading the tracker at https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
              
Passed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: true,true,true,true,true
Failed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: false,false,false,false,false
Passed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: true,true,true,true,true
Failed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: false,false,false,false,false
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,false,false,false,false
Failed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: false,false,false,false
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,false,false,false,false
Failed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: false,false,false
Failed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: false,false,false,false,false
Failed
url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
passed: false,false,false,false,false
Index Exchange
Tests whether the browser blocks the page from loading the tracker at https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
              
Passed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: true,true,true,true,true
Failed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: false,false,false,false,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,false,false,false,false
Failed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: false,false,false,false,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
Passed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: true,true,true,true
Passed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: true,true,true,true,true
Failed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: false,false,false,false,false
Failed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: false,false,false
Failed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: false,false,false,false,false
Failed
url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
passed: false,false,false,false,false
New Relic
Tests whether the browser blocks the page from loading the tracker at https://js-agent.newrelic.com/nr-1212.min.js
              
Passed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: true,true,true,true,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
Passed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: 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
Failed
url: https://js-agent.newrelic.com/nr-1212.min.js
passed: false,false,false
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
passed: true,true,true,true,true
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,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
Passed
url: https://pixel.quantserve.com/pixel
passed: 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
Failed
url: https://pixel.quantserve.com/pixel
passed: false,false,false
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
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
Failed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: false,false,false,false,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,false,false,false
Failed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: false,false,false,false,false
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: true,true,true,true
Failed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: false,false,false,false,false
Failed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: false,false,false,false,false
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,false,false,false,false
Failed
url: https://sb.scorecardresearch.com/internal-c2/default/cs.js
passed: false,false,false,false,false
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
Passed
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
passed: 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
Failed
url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json
passed: false,false,false
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
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,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
passed: true,true,true,true,true
Passed
url: https://t.co/i/adsct
passed: 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
Failed
url: https://t.co/i/adsct
passed: false,false,false
Failed
url: https://t.co/i/adsct
passed: false,false,false,false,false
Failed
url: https://t.co/i/adsct
passed: false,false,false,false,false
Yandex Ads
Tests whether the browser blocks the page from loading the tracker at https://yandex.ru/ads/system/header-bidding.js
              
Passed
url: https://yandex.ru/ads/system/header-bidding.js
passed: true,true,true,true,true
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
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
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
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.
              
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(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same session: h3, h3, h3, h3, h3

result, different session: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
      let responseText = "";
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/clear");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after clear:", responseText);
      // Store "h3" state in Alt-Svc cache
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/set");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after set:", responseText);
    }

read: async () => {
      const protocol = await fetchText(altSvcOrigin + "/protocol");
      if ((new URL(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same session: h3, h3, h3, h3, h3

result, different session: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
      let responseText = "";
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/clear");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after clear:", responseText);
      // Store "h3" state in Alt-Svc cache
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/set");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after set:", responseText);
    }

read: async () => {
      const protocol = await fetchText(altSvcOrigin + "/protocol");
      if ((new URL(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same session: h3, h3, h3, h3, h3

result, different session: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
      let responseText = "";
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/clear");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after clear:", responseText);
      // Store "h3" state in Alt-Svc cache
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/set");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after set:", responseText);
    }

read: async () => {
      const protocol = await fetchText(altSvcOrigin + "/protocol");
      if ((new URL(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same session: h3, h3, h3, h3, h3

result, different session: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
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(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same session: h3, h3, h3, h3, h3

result, different session: h2, h3, h2, h3, h2

unsupported: false, false, false, false, false

passed: true, false, true, false, 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(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same session: h3, h3, h3, h3, h3

result, different session: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
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(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same session: h3, h2, h3, h3

result, different session: h3, h2, h3, h2

unsupported: false, true, false, false

passed: false, false, true

test failed: 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(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same session: h3, h3, h3, h3, h3

result, different session: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Unsupported
write: async () => {
      // Clear Alt-Svc caching first.
      let responseText = "";
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/clear");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after clear:", responseText);
      // Store "h3" state in Alt-Svc cache
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/set");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after set:", responseText);
    }

read: async () => {
      const protocol = await fetchText(altSvcOrigin + "/protocol");
      if ((new URL(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(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same session: h2, h2, h2

result, different session: h2, h2, h2

unsupported: true, true, true

passed: undefined

test failed: false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
      let responseText = "";
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/clear");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after clear:", responseText);
      // Store "h3" state in Alt-Svc cache
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/set");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after set:", responseText);
    }

read: async () => {
      const protocol = await fetchText(altSvcOrigin + "/protocol");
      if ((new URL(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same session: h3, h3, h3, h3, h3

result, different session: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Passed
write: async () => {
      // Clear Alt-Svc caching first.
      let responseText = "";
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/clear");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after clear:", responseText);
      // Store "h3" state in Alt-Svc cache
      for (let i = 0; i < 3; ++i) {
        await fetch(altSvcOrigin + "/set");
        await sleepMs(100);
      }
      responseText = await fetchText(altSvcOrigin + "/protocol");
      console.log("after set:", responseText);
    }

read: async () => {
      const protocol = await fetchText(altSvcOrigin + "/protocol");
      if ((new URL(location)).searchParams.get("thirdparty") === "same") {
        if (protocol !== "h3") {
          throw new Error("Unsupported");
        }
      }
      return protocol;
    }

result, same session: h3, h3, h3, h3, h3

result, different session: h2, h2, h2, h2, h2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
CacheStorage
The Cache API is a content storage mechanism originally introduced to support ServiceWorkers. If the same Cache object is accessible to multiple websites, it can be abused to track users.
              
Failed
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same session: 
143d61f8-2894-4529-ad80-0a53e9ebc6cc_1p,
143d61f8-2894-4529-ad80-0a53e9ebc6cc_1p,
143d61f8-2894-4529-ad80-0a53e9ebc6cc_1p,
143d61f8-2894-4529-ad80-0a53e9ebc6cc_1p,
143d61f8-2894-4529-ad80-0a53e9ebc6cc_1p

result, different session: 
143d61f8-2894-4529-ad80-0a53e9ebc6cc_1p,
143d61f8-2894-4529-ad80-0a53e9ebc6cc_1p,
143d61f8-2894-4529-ad80-0a53e9ebc6cc_1p,
143d61f8-2894-4529-ad80-0a53e9ebc6cc_1p,
143d61f8-2894-4529-ad80-0a53e9ebc6cc_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 {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same session: 
c745bf91-cf98-4e5f-8375-d1de83cf19d5_1p,
c745bf91-cf98-4e5f-8375-d1de83cf19d5_1p,
c745bf91-cf98-4e5f-8375-d1de83cf19d5_1p,
c745bf91-cf98-4e5f-8375-d1de83cf19d5_1p,
c745bf91-cf98-4e5f-8375-d1de83cf19d5_1p

result, different session: 
c745bf91-cf98-4e5f-8375-d1de83cf19d5_1p,
c745bf91-cf98-4e5f-8375-d1de83cf19d5_1p,
c745bf91-cf98-4e5f-8375-d1de83cf19d5_1p,
c745bf91-cf98-4e5f-8375-d1de83cf19d5_1p,
c745bf91-cf98-4e5f-8375-d1de83cf19d5_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 {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same session: 
15571fa3-0642-4589-90a9-ec73a7a073d9_1p,
15571fa3-0642-4589-90a9-ec73a7a073d9_1p,
15571fa3-0642-4589-90a9-ec73a7a073d9_1p,
15571fa3-0642-4589-90a9-ec73a7a073d9_1p,
15571fa3-0642-4589-90a9-ec73a7a073d9_1p

result, different session: 
15571fa3-0642-4589-90a9-ec73a7a073d9_1p,
15571fa3-0642-4589-90a9-ec73a7a073d9_1p,
15571fa3-0642-4589-90a9-ec73a7a073d9_1p,
15571fa3-0642-4589-90a9-ec73a7a073d9_1p,
15571fa3-0642-4589-90a9-ec73a7a073d9_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 {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same session: 
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0_1p,
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0_1p,
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0_1p,
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0_1p,
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0_1p

result, different session: 
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0_1p,
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0_1p,
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0_1p,
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0_1p,
4aca6bfb-ecb4-47d0-bce6-bb64559cf8a0_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 {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same session: 
6b80d03e-105e-4201-b76d-0596f346aaac_1p,
6b80d03e-105e-4201-b76d-0596f346aaac_1p,
6b80d03e-105e-4201-b76d-0596f346aaac_1p,
6b80d03e-105e-4201-b76d-0596f346aaac_1p,
6b80d03e-105e-4201-b76d-0596f346aaac_1p

result, different session: 
6b80d03e-105e-4201-b76d-0596f346aaac_1p,
6b80d03e-105e-4201-b76d-0596f346aaac_1p,
6b80d03e-105e-4201-b76d-0596f346aaac_1p,
6b80d03e-105e-4201-b76d-0596f346aaac_1p,
6b80d03e-105e-4201-b76d-0596f346aaac_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 {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same session: 
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.

result, different session: 
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.

unsupported: true, true, true, true, true

passed: undefined

test failed: false, false, false, false, false
Failed
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same session: 
ec26e749-9cec-4f7a-98e6-641c090e7817_1p,
ec26e749-9cec-4f7a-98e6-641c090e7817_1p,
ec26e749-9cec-4f7a-98e6-641c090e7817_1p,
ec26e749-9cec-4f7a-98e6-641c090e7817_1p

result, different session: 
ec26e749-9cec-4f7a-98e6-641c090e7817_1p,
ec26e749-9cec-4f7a-98e6-641c090e7817_1p,
ec26e749-9cec-4f7a-98e6-641c090e7817_1p,
ec26e749-9cec-4f7a-98e6-641c090e7817_1p

unsupported: false, false, false, false

passed: false, false, false, false

test failed: false, false, false, false
Failed
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same session: 
c97b5d06-2396-4bb1-9f7d-6fde65072b04_1p,
c97b5d06-2396-4bb1-9f7d-6fde65072b04_1p,
c97b5d06-2396-4bb1-9f7d-6fde65072b04_1p,
c97b5d06-2396-4bb1-9f7d-6fde65072b04_1p,
c97b5d06-2396-4bb1-9f7d-6fde65072b04_1p

result, different session: 
c97b5d06-2396-4bb1-9f7d-6fde65072b04_1p,
c97b5d06-2396-4bb1-9f7d-6fde65072b04_1p,
c97b5d06-2396-4bb1-9f7d-6fde65072b04_1p,
c97b5d06-2396-4bb1-9f7d-6fde65072b04_1p,
c97b5d06-2396-4bb1-9f7d-6fde65072b04_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 {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same session: 
a31f089a-366d-46aa-8a3d-39c59eae3ef3_1p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_1p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_1p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_1p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_1p

result, different session: 
a31f089a-366d-46aa-8a3d-39c59eae3ef3_1p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_1p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_1p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_1p,
a31f089a-366d-46aa-8a3d-39c59eae3ef3_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 {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same session: 
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.

result, different session: 
Error: The operation is insecure.,
Error: The operation is insecure.,
Error: The operation is insecure.

unsupported: true, true, true

passed: undefined

test failed: false, false, false
Failed
write: async (key) => {
      try {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same session: 
1af58a1e-55c5-4125-ba6b-5729d21fd23c_1p,
1af58a1e-55c5-4125-ba6b-5729d21fd23c_1p,
1af58a1e-55c5-4125-ba6b-5729d21fd23c_1p,
1af58a1e-55c5-4125-ba6b-5729d21fd23c_1p,
1af58a1e-55c5-4125-ba6b-5729d21fd23c_1p

result, different session: 
1af58a1e-55c5-4125-ba6b-5729d21fd23c_1p,
1af58a1e-55c5-4125-ba6b-5729d21fd23c_1p,
1af58a1e-55c5-4125-ba6b-5729d21fd23c_1p,
1af58a1e-55c5-4125-ba6b-5729d21fd23c_1p,
1af58a1e-55c5-4125-ba6b-5729d21fd23c_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 {
        let cache = await caches.open("supercookies");
        cache.addAll([`test.css?key=${key}`]);
      } catch (e) {
        throw new Error("Unsupported");
      }
    }

read: async () => {
      let cache = await caches.open("supercookies");
      let cacheKeys = await cache.keys();
      let url = cacheKeys[0].url;
      return (new URL(url)).searchParams.get("key");
    }

result, same session: 
4f69eb13-b603-4269-81bb-78ce896b6e33_1p,
4f69eb13-b603-4269-81bb-78ce896b6e33_1p,
4f69eb13-b603-4269-81bb-78ce896b6e33_1p,
4f69eb13-b603-4269-81bb-78ce896b6e33_1p,
4f69eb13-b603-4269-81bb-78ce896b6e33_1p

result, different session: 
4f69eb13-b603-4269-81bb-78ce896b6e33_1p,
4f69eb13-b603-4269-81bb-78ce896b6e33_1p,
4f69eb13-b603-4269-81bb-78ce896b6e33_1p,
4f69eb13-b603-4269-81bb-78ce896b6e33_1p,
4f69eb13-b603-4269-81bb-78ce896b6e33_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.
              
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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same session: 
7458e015-b20f-4696-982b-aff57b0a74d4_1p_http,
233e87ca-b8aa-436e-b680-817d86c6acc6_1p_http,
93c14173-842d-44ed-a4ff-63e04b54c399_1p_http,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058_1p_http,
0fffef3e-f7ec-4b63-96e1-3579877405b9_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same session: 
a532c74b-ccca-4515-a333-acc0a246685e_1p_http,
101607a1-97bb-463f-a9d1-90092abd8d32_1p_http,
8db0833d-7b52-46e6-b332-55ab54a0a865_1p_http,
a349e1c6-758d-4877-aabd-0c7631135118_1p_http,
d64967c1-e520-4790-8fb7-45ad567e909b_1p_http

result, different session: 
a532c74b-ccca-4515-a333-acc0a246685e_1p_http,
101607a1-97bb-463f-a9d1-90092abd8d32_1p_http,
101607a1-97bb-463f-a9d1-90092abd8d32_1p_http,
a349e1c6-758d-4877-aabd-0c7631135118_1p_http,
d64967c1-e520-4790-8fb7-45ad567e909b_1p_http

unsupported: false, false, false, false, false

passed: false, false, true, 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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same session: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b_1p_http,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2_1p_http,
03b9d753-12c6-4473-b06d-b8373a015a62_1p_http,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f_1p_http,
04fae689-670b-4d64-9966-eb064fc485e2_1p_http

result, different session: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b_1p_http,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2_1p_http,
03b9d753-12c6-4473-b06d-b8373a015a62_1p_http,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f_1p_http,
04fae689-670b-4d64-9966-eb064fc485e2_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same session: 
e8304637-cd9b-4058-bcea-626aab9e6c48_1p_http,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b_1p_http,
358302cc-de3c-4795-9b0b-887befc03092_1p_http,
4baa56df-63a7-4df0-ae5c-40889f396f9b_1p_http,
e1def859-9956-483d-a3e7-968b58011edd_1p_http

result, different session: 
e8304637-cd9b-4058-bcea-626aab9e6c48_1p_http,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b_1p_http,
358302cc-de3c-4795-9b0b-887befc03092_1p_http,
4baa56df-63a7-4df0-ae5c-40889f396f9b_1p_http,
e1def859-9956-483d-a3e7-968b58011edd_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same session: 
1493eeef-c081-44cb-8d2a-f4ab9af6a92e_1p_http,
16ced892-e431-42ab-9017-da51b0a252c4_1p_http,
b123e636-13a4-400d-9ee2-2c169a0139aa_1p_http,
c697e0c1-9995-42a9-ba16-79646dbb7080_1p_http,
5bf95fd8-3c2f-45c7-8f72-f3d86b122801_1p_http

result, different session: 
1493eeef-c081-44cb-8d2a-f4ab9af6a92e_1p_http,
16ced892-e431-42ab-9017-da51b0a252c4_1p_http,
b123e636-13a4-400d-9ee2-2c169a0139aa_1p_http,
c697e0c1-9995-42a9-ba16-79646dbb7080_1p_http,
5bf95fd8-3c2f-45c7-8f72-f3d86b122801_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same session: 
9c2e169f-8427-4aef-a5d9-aae49dd17a75_1p_http,
93048464-dce7-4a11-bd17-e6d2a9f351ae_1p_http,
a0218bc8-aa46-4824-814a-e196a157d9ba_1p_http,
8bb72ef9-2ce9-4c9b-8cc4-3ada65a3c885_1p_http,
7dcd2a99-0b83-48d4-8de2-36ea2e2e15fa_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same session: 
c0c1c677-f40a-4384-a88c-e68592da8028_1p_http,
8611fa70-4e3c-419c-bf1c-14efadf3bf65_1p_http,
c9d39f37-3482-42a2-8c78-eae8ac064794_1p_http,
dfcafb86-c9a6-4426-adf1-7e4f52e6c84e_1p_http

result, different session: 
c0c1c677-f40a-4384-a88c-e68592da8028_1p_http,
8611fa70-4e3c-419c-bf1c-14efadf3bf65_1p_http,
c9d39f37-3482-42a2-8c78-eae8ac064794_1p_http,
dfcafb86-c9a6-4426-adf1-7e4f52e6c84e_1p_http

unsupported: false, false, false, false

passed: false, false, false, false

test failed: 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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same session: 
14e75fa4-a0d5-4431-9cba-1a4091496414_1p_http,
d2c62f48-b023-4b69-9342-2c559c33e3e1_1p_http,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71_1p_http,
ab020566-d8a9-41af-aec5-58a457f3429a_1p_http,
7d693c08-ae49-4855-88a9-ca684c95c567_1p_http

result, different session: 
14e75fa4-a0d5-4431-9cba-1a4091496414_1p_http,
d2c62f48-b023-4b69-9342-2c559c33e3e1_1p_http,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71_1p_http,
ab020566-d8a9-41af-aec5-58a457f3429a_1p_http,
7d693c08-ae49-4855-88a9-ca684c95c567_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same session: 
f3f67746-9960-4b78-baa7-a6efe6ca4476_1p_http,
eb0669e8-a477-4269-b334-0f6368e23739_1p_http,
309203c0-e03c-48c7-8048-dff552ec9f26_1p_http,
e390a75c-c1da-4107-b6ea-2796a43ee590_1p_http,
2274f6cd-be7d-4901-8463-5dbcfd05cce5_1p_http

result, different session: 
f3f67746-9960-4b78-baa7-a6efe6ca4476_1p_http,
eb0669e8-a477-4269-b334-0f6368e23739_1p_http,
309203c0-e03c-48c7-8048-dff552ec9f26_1p_http,
e390a75c-c1da-4107-b6ea-2796a43ee590_1p_http,
2274f6cd-be7d-4901-8463-5dbcfd05cce5_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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same session: 
05da0cf3-c3f1-456e-9131-51fd4bb8933d_1p_http,
e12f334e-76b0-4ebc-aa46-96e6aa14c022_1p_http,
39960fb8-e89f-4bf8-99a2-136a8909aa1c_1p_http

result, different session: , , 

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Failed
write: async (secret) => {
      // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value.
      await fetch(`${baseURI}cookie?secret=${secret}_http`);
    }

read: async () => {
      // Test if we now send a requests with a 'cookie' header containing the secret.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same session: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c_1p_http,
1407c508-f609-441d-9532-18e2ab87cff2_1p_http,
983896b9-fb6d-4759-a274-c1e36cfa3a67_1p_http,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb_1p_http,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7_1p_http

result, different session: 
3d9588ed-b599-4c7c-a956-51442ea97efe_1p_http,
1407c508-f609-441d-9532-18e2ab87cff2_1p_http,
1407c508-f609-441d-9532-18e2ab87cff2_1p_http,
1407c508-f609-441d-9532-18e2ab87cff2_1p_http,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7_1p_http

unsupported: false, false, false, false, false

passed: true, false, true, true, 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.
      let response = await fetch(`${baseURI}headers`);
      let cookie = (await response.json())["cookie"];
      return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null;
    }

result, same session: 
55443143-31e2-4079-87ff-2d3d1f51065a_1p_http,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5_1p_http,
736e1b37-65cf-48c4-82c4-eec3a005803b_1p_http,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda_1p_http,
2983da41-73b8-41fc-a719-30cc15f4f8f7_1p_http

result, different session: 
55443143-31e2-4079-87ff-2d3d1f51065a_1p_http,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5_1p_http,
736e1b37-65cf-48c4-82c4-eec3a005803b_1p_http,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda_1p_http,
2983da41-73b8-41fc-a719-30cc15f4f8f7_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.
              
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: 
7458e015-b20f-4696-982b-aff57b0a74d4_1p_js,
233e87ca-b8aa-436e-b680-817d86c6acc6_1p_js,
93c14173-842d-44ed-a4ff-63e04b54c399_1p_js,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058_1p_js,
0fffef3e-f7ec-4b63-96e1-3579877405b9_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: 
a532c74b-ccca-4515-a333-acc0a246685e_1p_js,
101607a1-97bb-463f-a9d1-90092abd8d32_1p_js,
8db0833d-7b52-46e6-b332-55ab54a0a865_1p_js,
a349e1c6-758d-4877-aabd-0c7631135118_1p_js,
d64967c1-e520-4790-8fb7-45ad567e909b_1p_js

result, different session: 
a532c74b-ccca-4515-a333-acc0a246685e_1p_js,
101607a1-97bb-463f-a9d1-90092abd8d32_1p_js,
101607a1-97bb-463f-a9d1-90092abd8d32_1p_js,
a349e1c6-758d-4877-aabd-0c7631135118_1p_js,
d64967c1-e520-4790-8fb7-45ad567e909b_1p_js

unsupported: false, false, false, false, false

passed: false, false, true, 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: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b_1p_js,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2_1p_js,
03b9d753-12c6-4473-b06d-b8373a015a62_1p_js,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f_1p_js,
04fae689-670b-4d64-9966-eb064fc485e2_1p_js

result, different session: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b_1p_js,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2_1p_js,
03b9d753-12c6-4473-b06d-b8373a015a62_1p_js,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f_1p_js,
04fae689-670b-4d64-9966-eb064fc485e2_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: 
e8304637-cd9b-4058-bcea-626aab9e6c48_1p_js,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b_1p_js,
358302cc-de3c-4795-9b0b-887befc03092_1p_js,
4baa56df-63a7-4df0-ae5c-40889f396f9b_1p_js,
e1def859-9956-483d-a3e7-968b58011edd_1p_js

result, different session: 
e8304637-cd9b-4058-bcea-626aab9e6c48_1p_js,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b_1p_js,
358302cc-de3c-4795-9b0b-887befc03092_1p_js,
4baa56df-63a7-4df0-ae5c-40889f396f9b_1p_js,
e1def859-9956-483d-a3e7-968b58011edd_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: 
1493eeef-c081-44cb-8d2a-f4ab9af6a92e_1p_js,
16ced892-e431-42ab-9017-da51b0a252c4_1p_js,
b123e636-13a4-400d-9ee2-2c169a0139aa_1p_js,
c697e0c1-9995-42a9-ba16-79646dbb7080_1p_js,
5bf95fd8-3c2f-45c7-8f72-f3d86b122801_1p_js

result, different session: 
1493eeef-c081-44cb-8d2a-f4ab9af6a92e_1p_js,
16ced892-e431-42ab-9017-da51b0a252c4_1p_js,
b123e636-13a4-400d-9ee2-2c169a0139aa_1p_js,
c697e0c1-9995-42a9-ba16-79646dbb7080_1p_js,
5bf95fd8-3c2f-45c7-8f72-f3d86b122801_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: 
9c2e169f-8427-4aef-a5d9-aae49dd17a75_1p_js,
93048464-dce7-4a11-bd17-e6d2a9f351ae_1p_js,
a0218bc8-aa46-4824-814a-e196a157d9ba_1p_js,
8bb72ef9-2ce9-4c9b-8cc4-3ada65a3c885_1p_js,
7dcd2a99-0b83-48d4-8de2-36ea2e2e15fa_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: 
c0c1c677-f40a-4384-a88c-e68592da8028_1p_js,
8611fa70-4e3c-419c-bf1c-14efadf3bf65_1p_js,
c9d39f37-3482-42a2-8c78-eae8ac064794_1p_js,
dfcafb86-c9a6-4426-adf1-7e4f52e6c84e_1p_js

result, different session: 
c0c1c677-f40a-4384-a88c-e68592da8028_1p_js,
8611fa70-4e3c-419c-bf1c-14efadf3bf65_1p_js,
c9d39f37-3482-42a2-8c78-eae8ac064794_1p_js,
dfcafb86-c9a6-4426-adf1-7e4f52e6c84e_1p_js

unsupported: false, false, false, false

passed: false, false, false, false

test failed: 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: 
14e75fa4-a0d5-4431-9cba-1a4091496414_1p_js,
d2c62f48-b023-4b69-9342-2c559c33e3e1_1p_js,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71_1p_js,
ab020566-d8a9-41af-aec5-58a457f3429a_1p_js,
7d693c08-ae49-4855-88a9-ca684c95c567_1p_js

result, different session: 
14e75fa4-a0d5-4431-9cba-1a4091496414_1p_js,
d2c62f48-b023-4b69-9342-2c559c33e3e1_1p_js,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71_1p_js,
ab020566-d8a9-41af-aec5-58a457f3429a_1p_js,
7d693c08-ae49-4855-88a9-ca684c95c567_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: 
f3f67746-9960-4b78-baa7-a6efe6ca4476_1p_js,
eb0669e8-a477-4269-b334-0f6368e23739_1p_js,
309203c0-e03c-48c7-8048-dff552ec9f26_1p_js,
e390a75c-c1da-4107-b6ea-2796a43ee590_1p_js,
2274f6cd-be7d-4901-8463-5dbcfd05cce5_1p_js

result, different session: 
f3f67746-9960-4b78-baa7-a6efe6ca4476_1p_js,
eb0669e8-a477-4269-b334-0f6368e23739_1p_js,
309203c0-e03c-48c7-8048-dff552ec9f26_1p_js,
e390a75c-c1da-4107-b6ea-2796a43ee590_1p_js,
2274f6cd-be7d-4901-8463-5dbcfd05cce5_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: 
05da0cf3-c3f1-456e-9131-51fd4bb8933d_1p_js,
e12f334e-76b0-4ebc-aa46-96e6aa14c022_1p_js,
39960fb8-e89f-4bf8-99a2-136a8909aa1c_1p_js

result, different session: , , 

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Failed
write: (secret) => {
      document.cookie = `secret=${secret}_js; max-age=3600; SameSite=None; Secure`;
    }

read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null

result, same session: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c_1p_js,
1407c508-f609-441d-9532-18e2ab87cff2_1p_js,
983896b9-fb6d-4759-a274-c1e36cfa3a67_1p_js,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb_1p_js,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7_1p_js

result, different session: 
3d9588ed-b599-4c7c-a956-51442ea97efe_1p_js,
1407c508-f609-441d-9532-18e2ab87cff2_1p_js,
1407c508-f609-441d-9532-18e2ab87cff2_1p_js,
1407c508-f609-441d-9532-18e2ab87cff2_1p_js,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7_1p_js

unsupported: false, false, false, false, false

passed: true, false, true, true, 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: 
55443143-31e2-4079-87ff-2d3d1f51065a_1p_js,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5_1p_js,
736e1b37-65cf-48c4-82c4-eec3a005803b_1p_js,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda_1p_js,
2983da41-73b8-41fc-a719-30cc15f4f8f7_1p_js

result, different session: 
55443143-31e2-4079-87ff-2d3d1f51065a_1p_js,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5_1p_js,
736e1b37-65cf-48c4-82c4-eec3a005803b_1p_js,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda_1p_js,
2983da41-73b8-41fc-a719-30cc15f4f8f7_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.
              
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: 
7458e015-b20f-4696-982b-aff57b0a74d4_1p,
233e87ca-b8aa-436e-b680-817d86c6acc6_1p,
93c14173-842d-44ed-a4ff-63e04b54c399_1p,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058_1p,
0fffef3e-f7ec-4b63-96e1-3579877405b9_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: 
a532c74b-ccca-4515-a333-acc0a246685e_1p,
101607a1-97bb-463f-a9d1-90092abd8d32_1p,
8db0833d-7b52-46e6-b332-55ab54a0a865_1p,
a349e1c6-758d-4877-aabd-0c7631135118_1p,
d64967c1-e520-4790-8fb7-45ad567e909b_1p

result, different session: 
a532c74b-ccca-4515-a333-acc0a246685e_1p,
101607a1-97bb-463f-a9d1-90092abd8d32_1p,
101607a1-97bb-463f-a9d1-90092abd8d32_1p,
a349e1c6-758d-4877-aabd-0c7631135118_1p,
d64967c1-e520-4790-8fb7-45ad567e909b_1p

unsupported: false, false, false, false, false

passed: false, false, true, 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: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b_1p,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2_1p,
03b9d753-12c6-4473-b06d-b8373a015a62_1p,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f_1p,
04fae689-670b-4d64-9966-eb064fc485e2_1p

result, different session: 
c581f98f-a8e3-43f4-ba48-76baf25afe1b_1p,
a9654e53-3ebc-4c4a-a6a8-934f1d34dbe2_1p,
03b9d753-12c6-4473-b06d-b8373a015a62_1p,
3f8228fe-1c2d-4958-9bb1-1f8ebaaa4e7f_1p,
04fae689-670b-4d64-9966-eb064fc485e2_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: 
e8304637-cd9b-4058-bcea-626aab9e6c48_1p,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b_1p,
358302cc-de3c-4795-9b0b-887befc03092_1p,
4baa56df-63a7-4df0-ae5c-40889f396f9b_1p,
e1def859-9956-483d-a3e7-968b58011edd_1p

result, different session: 
e8304637-cd9b-4058-bcea-626aab9e6c48_1p,
25fd7847-2aba-4201-8b3e-31c5cbb4b53b_1p,
358302cc-de3c-4795-9b0b-887befc03092_1p,
4baa56df-63a7-4df0-ae5c-40889f396f9b_1p,
e1def859-9956-483d-a3e7-968b58011edd_1p

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

result, different session: 
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
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: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

result, different session: 
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
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: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

result, different session: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

unsupported: true, true, true, true

passed: undefined

test failed: 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: 
14e75fa4-a0d5-4431-9cba-1a4091496414_1p,
d2c62f48-b023-4b69-9342-2c559c33e3e1_1p,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71_1p,
ab020566-d8a9-41af-aec5-58a457f3429a_1p,
7d693c08-ae49-4855-88a9-ca684c95c567_1p

result, different session: 
14e75fa4-a0d5-4431-9cba-1a4091496414_1p,
d2c62f48-b023-4b69-9342-2c559c33e3e1_1p,
6faac091-a8fe-48b8-8ab1-54e8aa7ddb71_1p,
ab020566-d8a9-41af-aec5-58a457f3429a_1p,
7d693c08-ae49-4855-88a9-ca684c95c567_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: 
f3f67746-9960-4b78-baa7-a6efe6ca4476_1p,
eb0669e8-a477-4269-b334-0f6368e23739_1p,
309203c0-e03c-48c7-8048-dff552ec9f26_1p,
e390a75c-c1da-4107-b6ea-2796a43ee590_1p,
2274f6cd-be7d-4901-8463-5dbcfd05cce5_1p

result, different session: 
f3f67746-9960-4b78-baa7-a6efe6ca4476_1p,
eb0669e8-a477-4269-b334-0f6368e23739_1p,
309203c0-e03c-48c7-8048-dff552ec9f26_1p,
e390a75c-c1da-4107-b6ea-2796a43ee590_1p,
2274f6cd-be7d-4901-8463-5dbcfd05cce5_1p

unsupported: false, false, false, false, false

passed: false, false, false, false, false

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: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

result, different session: 
Error: Unsupported,
Error: Unsupported,
Error: Unsupported

unsupported: true, true, true

passed: undefined

test failed: false, false, false
Failed
write: (data) => {
      const msPerHour = 60 * 60 * 1000;
      if (!window.cookieStore) {
        throw new Error("Unsupported");
      }
      window.cookieStore.set({
        name: "partition_test",
        value: data,
        expires: Date.now() + msPerHour,
        sameSite: "none"
      });
    }

read: async () => {
      if (!window.cookieStore) {
        throw new Error("Unsupported");
      }
      const cookie = await window.cookieStore.get("partition_test");
      if (!cookie) {
        return null;
      }
      return cookie.value;
    }

result, same session: 
8f42f99b-b62f-4b5b-b8f6-c9c84aece09c_1p,
1407c508-f609-441d-9532-18e2ab87cff2_1p,
983896b9-fb6d-4759-a274-c1e36cfa3a67_1p,
0ebe06e1-a40d-479f-ac13-7529f25a3dbb_1p,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7_1p

result, different session: 
3d9588ed-b599-4c7c-a956-51442ea97efe_1p,
1407c508-f609-441d-9532-18e2ab87cff2_1p,
1407c508-f609-441d-9532-18e2ab87cff2_1p,
1407c508-f609-441d-9532-18e2ab87cff2_1p,
64f2a49c-44ec-472c-bf2f-878f8a27d3a7_1p

unsupported: false, false, false, false, false

passed: true, false, true, true, 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: 
55443143-31e2-4079-87ff-2d3d1f51065a_1p,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5_1p,
736e1b37-65cf-48c4-82c4-eec3a005803b_1p,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda_1p,
2983da41-73b8-41fc-a719-30cc15f4f8f7_1p

result, different session: 
55443143-31e2-4079-87ff-2d3d1f51065a_1p,
4a4d8aa3-d9aa-424a-a773-2275066ce9a5_1p,
736e1b37-65cf-48c4-82c4-eec3a005803b_1p,
df1b8dcf-8374-40c9-af1b-aa3d2538bcda_1p,
2983da41-73b8-41fc-a719-30cc15f4f8f7_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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same session: 
fake_5398073367685312,
fake_6136005252225878,
fake_9493149244374404,
fake_1399193338346414,
fake_3929669518332546

result, different session: 
fake_5398073367685312,
fake_6136005252225878,
fake_9493149244374404,
fake_1399193338346414,
fake_3929669518332546

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same session: 
fake_5783093011995497,
fake_47377100750866763,
fake_9746750648265163,
fake_8941285662541227,
fake_22010474200312924

result, different session: 
fake_5783093011995497,
fake_47377100750866763,
fake_9746750648265163,
fake_8941285662541227,
fake_22010474200312924

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same session: 
fake_8888633382267843,
fake_006834491221936467,
fake_727849688833885,
fake_9509400601667284,
fake_045588382494653246

result, different session: 
fake_8888633382267843,
fake_006834491221936467,
fake_727849688833885,
fake_9509400601667284,
fake_045588382494653246

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same session: 
fake_35652071109036654,
fake_1380136996579926,
fake_0651918470920747,
fake_33175091241207455,
fake_8257699587956799

result, different session: 
fake_35652071109036654,
fake_1380136996579926,
fake_0651918470920747,
fake_33175091241207455,
fake_8257699587956799

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same session: 
fake_8410505640891417,
fake_5721072347557774,
fake_6960349942439956,
fake_6532946350145301,
fake_7667035607272685

result, different session: 
fake_8410505640891417,
fake_5721072347557774,
fake_6960349942439956,
fake_6532946350145301,
fake_7667035607272685

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same session: 
fake_852148002314894,
fake_12401225271051963,
fake_889612567900619,
fake_22109953953646455,
fake_9465385247922511

result, different session: 
fake_657103024948477,
fake_6414857547610879,
fake_6923583063877046,
fake_6421640995939459,
fake_7553104120953946

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same session: 
fake_15953835026526075,
fake_5083699300587248,
fake_5483621371563472,
fake_05640629969935018

result, different session: 
fake_15953835026526075,
fake_5083699300587248,
fake_5483621371563472,
fake_05640629969935018

unsupported: false, false, false, false

passed: false, false, false, false

test failed: 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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same session: 
fake_8679650610010814,
fake_1211411563773721,
fake_007233389003382884,
fake_01297036587110556,
fake_5961598764186242

result, different session: 
fake_8679650610010814,
fake_1211411563773721,
fake_007233389003382884,
fake_01297036587110556,
fake_5961598764186242

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same session: 
fake_62985273196997,
fake_6130715545715031,
fake_7657272639946875,
fake_02868374515554928,
fake_35659319328737826

result, different session: 
fake_62985273196997,
fake_6130715545715031,
fake_7657272639946875,
fake_02868374515554928,
fake_35659319328737826

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same session: 
fake_37014226281472373,
fake_5666484679898169,
fake_17921646676435432

result, different session: 
fake_11038184805019013,
fake_20462734458303733,
fake_663726290279457

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Failed
write: async (key) => {
      const href = testURI("resource", "css", key);
      const head = document.getElementsByTagName("head")[0];
      head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`;
      const testElement = document.querySelector("#css");
      let fontFamily;
      while (true) {
        await sleepMs(100);
        fontFamily = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same session: 
fake_8123279637703595,
fake_3255814188241466,
fake_4887708157508117,
fake_7097908043637733,
fake_873781256895708

result, different session: 
fake_8123279637703595,
fake_3255814188241466,
fake_4887708157508117,
fake_7097908043637733,
fake_873781256895708

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 = 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 = getComputedStyle(testElement).fontFamily;
        if (fontFamily.startsWith("fake")) {
          break;
        }
      }
      console.log(fontFamily);
      return fontFamily;
    }

result, same session: 
fake_9746140147992559,
fake_11392735358322637,
fake_2926986481991385,
fake_5562536908680851,
fake_9222235580182592

result, different session: 
fake_9746140147992559,
fake_11392735358322637,
fake_2926986481991385,
fake_5562536908680851,
fake_9222235580182592

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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let count = (await response.text()).trim();
      if (count === "0") {
        throw new Error("No requests received");
      }
      return count;
    }

result, same session: 1, 1, 1, 1

result, different session: 1, 1, 1, 1

unsupported: false, false, false, false

passed: false, false, false, false

test failed: false, false, false, false
Unsupported
write: (key) => key

read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
      await sleepMs(2000);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let count = (await response.text()).trim();
      if (count === "0") {
        throw new Error("No requests received");
      }
      return count;
    }

result, same session: 1, 1, 1, 1, 1

result, different session: 1, 1, 1, 1, 1

unsupported: false, false, false, false, false

passed: false, false, false, false, false

test failed: false, false, false, false, false
Passed
write: (key) => key

read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
      await sleepMs(2000);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let count = (await response.text()).trim();
      if (count === "0") {
        throw new Error("No requests received");
      }
      return count;
    }

result, same session: 1, 1, 1

result, different session: 2, 2, 2

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Failed
write: (key) => key

read: async (key) => {
      // Wait for the favicon to load (defined in supercookies.html)
      await sleepMs(2000);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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);
      let response = await fetch(
        testURI("ctr", "favicon", key), {"cache": "reload"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let countResponse = await fetch(testURI("ctr", "fetch", key),
                                      {cache: "reload"});
      return (await countResponse.text()).trim();
    }

result, same session: 1, 1, 1, 1, 1

result, different session: 2, 2, 2, 2, 2

unsupported: false, false, false, false, false

passed: true, true, true, true, true

test failed: false, false, false, false, false
Failed
write: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let countResponse = await fetch(testURI("ctr", "fetch", key),
                                      {cache: "reload"});
      return (await countResponse.text()).trim();
    }

result, same session: 1, 1, 1, 1

result, different session: 1, 1, 1, 1

unsupported: false, false, false, false

passed: false, false, false, false

test failed: false, false, false, false
Failed
write: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let countResponse = await fetch(testURI("ctr", "fetch", key),
                                      {cache: "reload"});
      return (await countResponse.text()).trim();
    }

result, same session: 1, 1, 1

result, different session: 2, 2, 2

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Failed
write: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      return key;
    }

read: async (key) => {
      let response = await fetch(testURI("resource", "fetch", key),
                                 {cache: "force-cache"});
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let response = await fetch(
        testURI("ctr", "font", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same session: 1, 1, 1, 1

result, different session: 1, 1, 1, 1

unsupported: false, false, false, false

passed: false, false, false, false

test failed: false, false, false, false
Failed
write: async (key) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let response = await fetch(
        testURI("ctr", "font", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same session: 1, 1, 1

result, different session: 2, 2, 2

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Failed
write: async (key) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let style = document.createElement("style");
      style.type='text/css';
      let 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;
      let style = document.createElement("style");
      style.type='text/css';
      let 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)
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let response = await fetch(
        testURI("ctr", "page", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same session: 1, 1, 1, 1

result, different session: 1, 1, 1, 1

unsupported: false, false, false, false

passed: false, false, false, false

test failed: false, false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let response = await fetch(
        testURI("ctr", "page", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same session: 1, 1, 1

result, different session: 2, 2, 2

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      iframe.addEventListener("load", () => resolve(key), {once: true});
      iframe.src = testURI("resource", "page", key);
    })

read: async (key) => {
      let iframe = document.createElement("iframe");
      document.body.appendChild(iframe);
      let iframeLoadPromise = new Promise((resolve, reject) => {
        iframe.addEventListener("load", resolve, {once: true});
      });
      let address = testURI("resource", "page", key);
      iframe.src = address;
      await iframeLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let response = await fetch(
        testURI("ctr", "image", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same session: 1, 1, 1, 1

result, different session: 1, 1, 1, 1

unsupported: false, false, false, false

passed: false, false, false, false

test failed: false, false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let response = await fetch(
        testURI("ctr", "image", key), {"cache": "reload"});
      return (await response.text()).trim();
    }

result, same session: 1, 1, 1

result, different session: 2, 2, 2

unsupported: false, false, false

passed: true, true, true

test failed: false, false, false
Failed
write: (key) => new Promise((resolve, reject) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      img.addEventListener("load", () => resolve(key), {once: true});
      img.src = testURI("resource", "image", key);
    })

read: async (key) => {
      let img = document.createElement("img");
      document.body.appendChild(img);
      let imgLoadPromise = new Promise((resolve, reject) => {
        img.addEventListener("load", resolve, {once: true});
      });
      img.src = testURI("resource", "image", key);
      await imgLoadPromise;
      let 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: 
7458e015-b20f-4696-982b-aff57b0a74d4_1p,
233e87ca-b8aa-436e-b680-817d86c6acc6_1p,
93c14173-842d-44ed-a4ff-63e04b54c399_1p,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058_1p,
0fffef3e-f7ec-4b63-96e1-3579877405b9_1p

result, different session: 
7458e015-b20f-4696-982b-aff57b0a74d4_1p,
233e87ca-b8aa-436e-b680-817d86c6acc6_1p,
93c14173-842d-44ed-a4ff-63e04b54c399_1p,
b48bd424-7e5d-41b9-ac0e-f1e1a93ff058_1p,
0fffef3e-f7ec-4b63-96e1-3579877405b9_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: 
a532c74b-ccca-4515-a333-acc0a246685e_1p,
101607a1-97bb-463f-a9d1-90092abd8d32_1p,
8db0833d-7b52-46e6-b332-55ab54a0a865_1p,
a349e1c6-758d-4877-aabd-0c7631135118_1p,
d64967c1-e520-4790-8fb7-45ad567e909b_1p

result, different session: 
a532c74b-ccca-4515-a333-acc0a246685e_1p,
101607a1-97bb-463f-a9d1-90092abd8d32_1p,
8db0833d-7b52-46e6-b332-55ab54a0a865_1p,
a349e1c6-758d-4877-aabd-0c7631135118_1p,
d64967c1-e520-4790-8fb7-45ad567e90