iOS Browsers
(click anywhere for more info)


brave
1.32

chrome
96.4664

duckduckgo
7.65

edge
96.1054

firefox
40.1

focus
40.0

opera
3.2

safari
15.2

yandex
2111.7
State Partitioning testsA 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-SvcAlt-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.
write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h2 result, different first party: h2 unsupported: true passed: undefined test failed: false
write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h2 result, different first party: h2 unsupported: true passed: undefined test failed: false
write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h2 result, different first party: h2 unsupported: true passed: undefined test failed: false
write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h2 result, different first party: h2 unsupported: true passed: undefined test failed: false
write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h2 result, different first party: h2 unsupported: true passed: undefined test failed: false
write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h2 result, different first party: h2 unsupported: true passed: undefined test failed: false
write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h2 result, different first party: h2 unsupported: true passed: undefined test failed: false
write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h2 result, different first party: h2 unsupported: true passed: undefined test failed: false
write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h2 result, different first party: h2 unsupported: true passed: undefined test failed: false
blobA 'blob URL' is a local reference to some raw data. Trackers can use a blob URL to share data between websites.
  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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 9a42305d-fa19-4fb9-859a-2ffd49be6633 result, different first party: 9a42305d-fa19-4fb9-859a-2ffd49be6633 unsupported: false passed: false test failed: false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 4409c325-7a0e-4fd1-a602-b05fe5d2f808 result, different first party: 4409c325-7a0e-4fd1-a602-b05fe5d2f808 unsupported: false passed: false test failed: false
  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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 01d42778-3975-4a75-a1e2-464880100b71 result, different first party: 01d42778-3975-4a75-a1e2-464880100b71 unsupported: false passed: false test failed: false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 76ff53c9-e4b6-445e-bb7b-5b32d9820a73 result, different first party: 76ff53c9-e4b6-445e-bb7b-5b32d9820a73 unsupported: false passed: false test failed: false
  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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: a866563f-d4ac-4ce1-9105-1a1b580a52ae result, different first party: a866563f-d4ac-4ce1-9105-1a1b580a52ae unsupported: false passed: false test failed: false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: Load failed result, different first party: Error: Load failed unsupported: false passed: undefined test failed: true
  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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 3eb35128-c4e4-4d65-a4ac-3653e4e82782 result, different first party: 3eb35128-c4e4-4d65-a4ac-3653e4e82782 unsupported: false passed: false test failed: false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 2dff31ac-8fe2-4b16-b135-bed1cb7f7b20 result, different first party: 2dff31ac-8fe2-4b16-b135-bed1cb7f7b20 unsupported: false passed: false test failed: false
  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: 57e06c53-1bba-4b4f-9773-a906cff928ce result, different first party: 57e06c53-1bba-4b4f-9773-a906cff928ce unsupported: false passed: false test failed: false
BroadcastChannelA BroadcastChannel is designed to send messages between tabs. In some browsers it can be used for cross-site communication and tracking.
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: Can't find variable: BroadcastChannel result, different first party: Error: Can't find variable: BroadcastChannel unsupported: true passed: undefined test failed: false
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: Can't find variable: BroadcastChannel result, different first party: Error: Can't find variable: BroadcastChannel unsupported: true passed: undefined test failed: false
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: Can't find variable: BroadcastChannel result, different first party: Error: Can't find variable: BroadcastChannel unsupported: true passed: undefined test failed: false
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: Can't find variable: BroadcastChannel result, different first party: Error: Can't find variable: BroadcastChannel unsupported: true passed: undefined test failed: false
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: Can't find variable: BroadcastChannel result, different first party: Error: Can't find variable: BroadcastChannel unsupported: true passed: undefined test failed: false
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: Can't find variable: BroadcastChannel result, different first party: Error: Can't find variable: BroadcastChannel unsupported: true passed: undefined test failed: false
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: Can't find variable: BroadcastChannel result, different first party: Error: Can't find variable: BroadcastChannel unsupported: true passed: undefined test failed: false
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: Can't find variable: BroadcastChannel result, different first party: Error: Can't find variable: BroadcastChannel unsupported: true passed: undefined test failed: false
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: Can't find variable: BroadcastChannel result, different first party: Error: Can't find variable: BroadcastChannel unsupported: true passed: undefined test failed: false
CacheStorageThe 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.
  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: f50b2dfd-9094-4878-8724-8baa49a59561 result, different first party: Error: undefined is not an object (evaluating 'cacheKeys[0].url') unsupported: false passed: true test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 03b4e3c4-0049-4bf6-8a37-e0fbf111d3c5 result, different first party: Error: undefined is not an object (evaluating 'cacheKeys[0].url') unsupported: false passed: true test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: ec52191c-69fe-44d4-b0fc-bacc869e8282 result, different first party: Error: undefined is not an object (evaluating 'cacheKeys[0].url') unsupported: false passed: true test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: e4ad1223-d6ba-4df6-a145-c0cd1158721c result, different first party: Error: undefined is not an object (evaluating 'cacheKeys[0].url') unsupported: false passed: true test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 223a5a5c-33dd-4c58-a002-fba913a186d0 result, different first party: Error: undefined is not an object (evaluating 'cacheKeys[0].url') unsupported: false passed: true test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: fd309849-c8ee-4e89-937c-81ceea438250 result, different first party: Error: undefined is not an object (evaluating 'cacheKeys[0].url') unsupported: false passed: true test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 3e214438-94f0-4a2e-91bd-eee24fefac54 result, different first party: Error: undefined is not an object (evaluating 'cacheKeys[0].url') unsupported: false passed: true test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: d4e6dbc9-4647-4da6-a4a1-5007a27e4311 result, different first party: Error: undefined is not an object (evaluating 'cacheKeys[0].url') unsupported: false passed: true test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 553e6d4f-7eeb-4a61-a04d-516ec12b52b2 result, different first party: Error: undefined is not an object (evaluating 'cacheKeys[0].url') unsupported: false passed: true test failed: false
cookieThe 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.
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 9a42305d-fa19-4fb9-859a-2ffd49be6633 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 4409c325-7a0e-4fd1-a602-b05fe5d2f808 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 01d42778-3975-4a75-a1e2-464880100b71 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 76ff53c9-e4b6-445e-bb7b-5b32d9820a73 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: a866563f-d4ac-4ce1-9105-1a1b580a52ae result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: fd309849-c8ee-4e89-937c-81ceea438250 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 3eb35128-c4e4-4d65-a4ac-3653e4e82782 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 2dff31ac-8fe2-4b16-b135-bed1cb7f7b20 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 57e06c53-1bba-4b4f-9773-a906cff928ce result, different first party: null unsupported: false passed: true test failed: false
CSS cacheCSS stylesheets are cached, and if that cache is shared between websites, it can be used to track users across sites.
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; 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 += ``; 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_8067840643089943 result, different first party: fake_042963828573761687 unsupported: false passed: true test failed: false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; 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 += ``; 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_6395104695965199 result, different first party: fake_45667485551106 unsupported: false passed: true test failed: false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; 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 += ``; 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_8400252289113579 result, different first party: fake_05898198503852403 unsupported: false passed: true test failed: false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; 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 += ``; 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_6331972255261802 result, different first party: fake_18671440750227597 unsupported: false passed: true test failed: false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; 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 += ``; 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_5923067382992406 result, different first party: fake_13898946440795878 unsupported: false passed: true test failed: false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; 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 += ``; 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_8924232566882537 result, different first party: fake_23892737255193564 unsupported: false passed: true test failed: false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; 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 += ``; 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_8894967472946713 result, different first party: fake_9050835673066153 unsupported: false passed: true test failed: false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; 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 += ``; 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_5908028549166253 result, different first party: fake_8387097120512612 unsupported: false passed: true test failed: false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; 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 += ``; 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_9109357236315319 result, different first party: fake_15948873062086721 unsupported: false passed: true test failed: false
favicon cacheA 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.
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); 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 result, different first party: 1 unsupported: false passed: false test failed: false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); 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 result, different first party: 1 unsupported: false passed: false test failed: false
write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); 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 result, different first party: Error: No requests received unsupported: true passed: undefined test failed: false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); 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 result, different first party: 1 unsupported: false passed: false test failed: false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); 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 result, different first party: 1 unsupported: false passed: false test failed: false
write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); 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 result, different first party: Error: No requests received unsupported: true passed: undefined test failed: false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); 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 result, different first party: 1 unsupported: false passed: false test failed: false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); 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 result, different first party: 1 unsupported: false passed: false test failed: false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); 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 result, different first party: 1 unsupported: false passed: false test failed: false
fetch cacheWhen a resource is received via the Fetch API, it is frequently cached. That cache can potentially be abused for cross-site tracking.
  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: 3 result, different first party: 4 unsupported: false passed: true test failed: false
  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: 3 result, different first party: 4 unsupported: false passed: true test failed: false
  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: 3 result, different first party: 4 unsupported: false passed: true test failed: false
  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: 3 result, different first party: 4 unsupported: false passed: true test failed: false
  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: 3 result, different first party: 4 unsupported: false passed: true test failed: false
  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: 3 result, different first party: 4 unsupported: false passed: true test failed: false
  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: 3 result, different first party: 4 unsupported: false passed: true test failed: false
  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: 3 result, different first party: 4 unsupported: false passed: true test failed: false
  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: 3 result, different first party: 4 unsupported: false passed: true test failed: false
font cacheWeb fonts are sometimes stored in their own cache, which is vulnerable to being abused for cross-site tracking.
  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) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1 result, different first party: 2 unsupported: false passed: true test failed: false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1 result, different first party: 2 unsupported: false passed: true test failed: false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1 result, different first party: 2 unsupported: false passed: true test failed: false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1 result, different first party: 2 unsupported: false passed: true test failed: false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1 result, different first party: 2 unsupported: false passed: true test failed: false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1 result, different first party: 2 unsupported: false passed: true test failed: false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1 result, different first party: 2 unsupported: false passed: true test failed: false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1 result, different first party: 2 unsupported: false passed: true test failed: false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1 result, different first party: 2 unsupported: false passed: true test failed: false
H1 connectionHTTP/1.x are the classic web connection protocols. If these connections are re-used across websites, they can be used to track users.
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 9a42305d-fa19-4fb9-859a-2ffd49be6633 result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: result, different first party: unsupported: false passed: undefined test failed: true
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 01d42778-3975-4a75-a1e2-464880100b71 result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: result, different first party: unsupported: false passed: undefined test failed: true
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: a866563f-d4ac-4ce1-9105-1a1b580a52ae result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: fd309849-c8ee-4e89-937c-81ceea438250 result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 3eb35128-c4e4-4d65-a4ac-3653e4e82782 result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 2dff31ac-8fe2-4b16-b135-bed1cb7f7b20 result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 57e06c53-1bba-4b4f-9773-a906cff928ce result, different first party: unsupported: false passed: true test failed: false
H2 connectionHTTP/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.
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 9a42305d-fa19-4fb9-859a-2ffd49be6633 result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: result, different first party: unsupported: false passed: undefined test failed: true
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 01d42778-3975-4a75-a1e2-464880100b71 result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: result, different first party: unsupported: false passed: undefined test failed: true
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: a866563f-d4ac-4ce1-9105-1a1b580a52ae result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: fd309849-c8ee-4e89-937c-81ceea438250 result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 3eb35128-c4e4-4d65-a4ac-3653e4e82782 result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 2dff31ac-8fe2-4b16-b135-bed1cb7f7b20 result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 57e06c53-1bba-4b4f-9773-a906cff928ce result, different first party: unsupported: false passed: true test failed: false
H3 connectionHTTP/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.
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.arthuredelstein.net:4433/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/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.arthuredelstein.net:4433/connection_id`); return await response.text(); } result, same first party: result, different first party: unsupported: true passed: undefined test failed: false
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.arthuredelstein.net:4433/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/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.arthuredelstein.net:4433/connection_id`); return await response.text(); } result, same first party: result, different first party: unsupported: true passed: undefined test failed: false
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.arthuredelstein.net:4433/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/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.arthuredelstein.net:4433/connection_id`); return await response.text(); } result, same first party: result, different first party: unsupported: true passed: undefined test failed: false
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.arthuredelstein.net:4433/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/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.arthuredelstein.net:4433/connection_id`); return await response.text(); } result, same first party: result, different first party: unsupported: true passed: undefined test failed: false
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.arthuredelstein.net:4433/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/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.arthuredelstein.net:4433/connection_id`); return await response.text(); } result, same first party: result, different first party: unsupported: true passed: undefined test failed: false
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.arthuredelstein.net:4433/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/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.arthuredelstein.net:4433/connection_id`); return await response.text(); } result, same first party: result, different first party: unsupported: true passed: undefined test failed: false
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.arthuredelstein.net:4433/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/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.arthuredelstein.net:4433/connection_id`); return await response.text(); } result, same first party: result, different first party: unsupported: true passed: undefined test failed: false
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.arthuredelstein.net:4433/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/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.arthuredelstein.net:4433/connection_id`); return await response.text(); } result, same first party: result, different first party: unsupported: true passed: undefined test failed: false
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.arthuredelstein.net:4433/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/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.arthuredelstein.net:4433/connection_id`); return await response.text(); } result, same first party: result, different first party: unsupported: true passed: undefined test failed: false
HSTS cacheThe 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.
write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: Error: image load failed result, different first party: Error: image load failed unsupported: true passed: undefined test failed: false
write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: Error: image load failed result, different first party: Error: image load failed unsupported: true passed: undefined test failed: false
write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: Error: image load failed result, different first party: Error: image load failed unsupported: true passed: undefined test failed: false
write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: Error: image load failed result, different first party: Error: image load failed unsupported: true passed: undefined test failed: false
write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: Error: image load failed result, different first party: Error: image load failed unsupported: true passed: undefined test failed: false
write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: Error: image load failed result, different first party: Error: image load failed unsupported: true passed: undefined test failed: false
write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: Error: image load failed result, different first party: Error: image load failed unsupported: true passed: undefined test failed: false
write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: Error: image load failed result, different first party: Error: image load failed unsupported: true passed: undefined test failed: false
write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: Error: image load failed result, different first party: Error: image load failed unsupported: true passed: undefined test failed: false
iframe cacheAn 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.
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
image cacheCaching of images in web browsers is a standard behavior. But if that cache leaks between websites, it can be abused for cross-site tracking.
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
  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 result, different first party: 2 unsupported: false passed: true test failed: false
indexedDBThe IndexedDB API exposes a transactional database to web pages. That database can be used to track users across websites, unless it is partitioned.
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: 9a42305d-fa19-4fb9-859a-2ffd49be6633 result, different first party: undefined unsupported: false passed: true test failed: false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: 4409c325-7a0e-4fd1-a602-b05fe5d2f808 result, different first party: undefined unsupported: false passed: true test failed: false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: 01d42778-3975-4a75-a1e2-464880100b71 result, different first party: undefined unsupported: false passed: true test failed: false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: 76ff53c9-e4b6-445e-bb7b-5b32d9820a73 result, different first party: undefined unsupported: false passed: true test failed: false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: a866563f-d4ac-4ce1-9105-1a1b580a52ae result, different first party: undefined unsupported: false passed: true test failed: false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: fd309849-c8ee-4e89-937c-81ceea438250 result, different first party: undefined unsupported: false passed: true test failed: false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: 3eb35128-c4e4-4d65-a4ac-3653e4e82782 result, different first party: undefined unsupported: false passed: true test failed: false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: 2dff31ac-8fe2-4b16-b135-bed1cb7f7b20 result, different first party: undefined unsupported: false passed: true test failed: false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: 57e06c53-1bba-4b4f-9773-a906cff928ce result, different first party: undefined unsupported: false passed: true test failed: false
localStorageThe 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.
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 9a42305d-fa19-4fb9-859a-2ffd49be6633 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 4409c325-7a0e-4fd1-a602-b05fe5d2f808 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 01d42778-3975-4a75-a1e2-464880100b71 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 76ff53c9-e4b6-445e-bb7b-5b32d9820a73 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: a866563f-d4ac-4ce1-9105-1a1b580a52ae result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: fd309849-c8ee-4e89-937c-81ceea438250 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 3eb35128-c4e4-4d65-a4ac-3653e4e82782 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 2dff31ac-8fe2-4b16-b135-bed1cb7f7b20 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 57e06c53-1bba-4b4f-9773-a906cff928ce result, different first party: null unsupported: false passed: true test failed: false
locksnavigator.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.
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: undefined result, different first party: undefined unsupported: true passed: undefined test failed: false
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: undefined result, different first party: undefined unsupported: true passed: undefined test failed: false
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: undefined result, different first party: undefined unsupported: true passed: undefined test failed: false
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: undefined result, different first party: undefined unsupported: true passed: undefined test failed: false
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: undefined result, different first party: undefined unsupported: true passed: undefined test failed: false
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: undefined result, different first party: undefined unsupported: true passed: undefined test failed: false
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: undefined result, different first party: undefined unsupported: true passed: undefined test failed: false
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: undefined result, different first party: undefined unsupported: true passed: undefined test failed: false
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: undefined result, different first party: undefined unsupported: true passed: undefined test failed: false
prefetch cacheA 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.
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 result, different first party: Error: No requests received unsupported: true passed: undefined test failed: false
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 result, different first party: Error: No requests received unsupported: true passed: undefined test failed: false
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 result, different first party: Error: No requests received unsupported: true passed: undefined test failed: false
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 result, different first party: Error: No requests received unsupported: true passed: undefined test failed: false
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 result, different first party: Error: No requests received unsupported: true passed: undefined test failed: false
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 result, different first party: Error: No requests received unsupported: true passed: undefined test failed: false
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 result, different first party: Error: No requests received unsupported: true passed: undefined test failed: false
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 result, different first party: Error: No requests received unsupported: true passed: undefined test failed: false
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 result, different first party: Error: No requests received unsupported: true passed: undefined test failed: false
ServiceWorkerThe 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.
  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 () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); 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: 9a42305d-fa19-4fb9-859a-2ffd49be6633 result, different first party: unsupported: false passed: true test failed: false
  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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 4409c325-7a0e-4fd1-a602-b05fe5d2f808 result, different first party: unsupported: false passed: true test failed: false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); 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: 01d42778-3975-4a75-a1e2-464880100b71 result, different first party: unsupported: false passed: true test failed: false
  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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 76ff53c9-e4b6-445e-bb7b-5b32d9820a73 result, different first party: unsupported: false passed: true test failed: false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); 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: a866563f-d4ac-4ce1-9105-1a1b580a52ae result, different first party: unsupported: false passed: true test failed: false
  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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: fd309849-c8ee-4e89-937c-81ceea438250 result, different first party: unsupported: false passed: true test failed: false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); 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: 3eb35128-c4e4-4d65-a4ac-3653e4e82782 result, different first party: unsupported: false passed: true test failed: false
  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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 2dff31ac-8fe2-4b16-b135-bed1cb7f7b20 result, different first party: unsupported: false passed: true test failed: false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); 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: 57e06c53-1bba-4b4f-9773-a906cff928ce result, different first party: unsupported: false passed: true test failed: false
SharedWorkerThe 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.
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: Can't find variable: SharedWorker result, different first party: Error: Can't find variable: SharedWorker unsupported: true passed: undefined test failed: false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: Can't find variable: SharedWorker result, different first party: Error: Can't find variable: SharedWorker unsupported: true passed: undefined test failed: false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: Can't find variable: SharedWorker result, different first party: Error: Can't find variable: SharedWorker unsupported: true passed: undefined test failed: false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: Can't find variable: SharedWorker result, different first party: Error: Can't find variable: SharedWorker unsupported: true passed: undefined test failed: false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: Can't find variable: SharedWorker result, different first party: Error: Can't find variable: SharedWorker unsupported: true passed: undefined test failed: false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: Can't find variable: SharedWorker result, different first party: Error: Can't find variable: SharedWorker unsupported: true passed: undefined test failed: false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: Can't find variable: SharedWorker result, different first party: Error: Can't find variable: SharedWorker unsupported: true passed: undefined test failed: false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: Can't find variable: SharedWorker result, different first party: Error: Can't find variable: SharedWorker unsupported: true passed: undefined test failed: false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: Can't find variable: SharedWorker result, different first party: Error: Can't find variable: SharedWorker unsupported: true passed: undefined test failed: false
TLS Session IDThe 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.
  write: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } read: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } result, same first party: 0e03878565614c3b27418172e648d02acffa3d90eb910fe4a41f762ffeb3c9b9 result, different first party: d929b23cf482767b2fd48693d83374c27e56538391736288e08f073e6d7b3b38 unsupported: false passed: true test failed: false
  write: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } read: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } result, same first party: 57cd24c4cb260060c19d43a801aedc65549a3567cf0f050171177dffd4511e6f result, different first party: 988ebe4a7a64d0665558261db4e76458ebffae57d7609e8cf1f2823459d2682c unsupported: false passed: true test failed: false
  write: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } read: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } result, same first party: 9dcd69e2f3a9466378737c6e96187350bb74108b8e4ca46d96c5428e634c5504 result, different first party: 69515839816953dc615119521994110d84a6c8b818875b5e2772c0e310bd12b6 unsupported: false passed: true test failed: false
  write: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } read: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } result, same first party: 6f38920712870bd2cf856d46cb1eeede7f1df88fdb3a92405b34fc7d34b43908 result, different first party: 1c1783f58ecf5e7ebcb7cca4dadf933db3e246aa0ac15363d72dc68af8f21494 unsupported: false passed: true test failed: false
  write: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } read: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } result, same first party: 2899e054bfd8d793a28e8a00071f1ac4cc0451c01840495653cffc4f071d68df result, different first party: 2df861191daaad38eb715784691f3c04a8f99e55b27ebf67bc90f48870a13e5c unsupported: false passed: true test failed: false
  write: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } read: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } result, same first party: 1eddce54059a89b31dbfac2db8fd0edfbd2681621de40cd67c1f1d03ada1f45c result, different first party: 04191a930cf1953b80011b043a33dd58f58b69423b7ffdaf45fef46123d492ae unsupported: false passed: true test failed: false
  write: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } read: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } result, same first party: 0b22d0119a0eaea929d085c4661f5347fa1038fb63056f258dbe1ca9363024ad result, different first party: c6db4f8b1c9f021555d4f70250fb0a0497e5b0691f87ae89f78b968d3ff8b1bd unsupported: false passed: true test failed: false
  write: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } read: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } result, same first party: b160e5dea8768f2e69df44d2b07206a854de74697e267028cc87157d9c2d680d result, different first party: 98cfc530ac9e37d771d4603cc6620f48e12d9a1f392bb435b453e13bab95dba8 unsupported: false passed: true test failed: false
  write: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } read: async () => { let results = await fetch("https://tls.arthuredelstein.net:8900/"); return (await results.json()).sessionId; } result, same first party: 6e0676fd3dc197e2381e854463863eb34b7b6fdbf24c63977d112d07b7138fc2 result, different first party: bde482e2debbad2359e1247601628e89b851b84ca3aebfd204bf3b11c6d60bc2 unsupported: false passed: true test failed: false
Web SQL DatabaseThe Web SQL Database is a deprecated web API for storing data in an SQL database.
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } 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: Web SQL is deprecated result, different first party: Error: Web SQL is deprecated unsupported: true passed: undefined test failed: false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } 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: Web SQL is deprecated result, different first party: Error: Web SQL is deprecated unsupported: true passed: undefined test failed: false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } 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: Web SQL is deprecated result, different first party: Error: Web SQL is deprecated unsupported: true passed: undefined test failed: false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } 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: Web SQL is deprecated result, different first party: Error: Web SQL is deprecated unsupported: true passed: undefined test failed: false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } 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: Web SQL is deprecated result, different first party: Error: Web SQL is deprecated unsupported: true passed: undefined test failed: false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } 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: Web SQL is deprecated result, different first party: Error: Web SQL is deprecated unsupported: true passed: undefined test failed: false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } 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: Web SQL is deprecated result, different first party: Error: Web SQL is deprecated unsupported: true passed: undefined test failed: false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } 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: Web SQL is deprecated result, different first party: Error: Web SQL is deprecated unsupported: true passed: undefined test failed: false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } 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: Web SQL is deprecated result, different first party: Error: Web SQL is deprecated unsupported: true passed: undefined test failed: false
XMLHttpRequest cacheSimilar to the newer Fetch API, any resource received may be cached by the browser. The cache is potentially vulnerable to cross-site tracking attack.
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Sat, 25 Dec 2021 19:42:59 GMT result, different first party: Sat, 25 Dec 2021 19:43:08 GMT unsupported: false passed: true test failed: false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Sat, 25 Dec 2021 19:38:46 GMT result, different first party: Sat, 25 Dec 2021 19:38:57 GMT unsupported: false passed: true test failed: false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Sat, 25 Dec 2021 19:44:48 GMT result, different first party: Fri, 24 Dec 2021 07:28:51 GMT unsupported: false passed: true test failed: false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Sat, 25 Dec 2021 19:40:48 GMT result, different first party: Sat, 25 Dec 2021 19:41:00 GMT unsupported: false passed: true test failed: false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Sat, 25 Dec 2021 19:30:58 GMT result, different first party: Sat, 25 Dec 2021 19:31:08 GMT unsupported: false passed: true test failed: false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Sat, 25 Dec 2021 19:35:22 GMT result, different first party: Sat, 25 Dec 2021 19:35:31 GMT unsupported: false passed: true test failed: false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Sat, 25 Dec 2021 19:36:59 GMT result, different first party: Sat, 25 Dec 2021 19:37:08 GMT unsupported: false passed: true test failed: false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Sat, 25 Dec 2021 19:32:40 GMT result, different first party: Fri, 24 Dec 2021 07:12:50 GMT unsupported: false passed: true test failed: false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Sat, 25 Dec 2021 19:49:41 GMT result, different first party: Sat, 25 Dec 2021 19:49:51 GMT unsupported: false passed: true test failed: false
Navigation testsWhen 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.referrerThe 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.
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/ unsupported: false passed: false test failed: false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/ unsupported: false passed: false test failed: false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/ unsupported: false passed: false test failed: false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/ unsupported: false passed: false test failed: false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/ unsupported: false passed: false test failed: false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/ unsupported: false passed: false test failed: false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/ unsupported: false passed: false test failed: false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/ unsupported: false passed: false test failed: false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/ unsupported: false passed: false test failed: false
sessionStorageThe 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.
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 9a42305d-fa19-4fb9-859a-2ffd49be6633 result, different first party: 9a42305d-fa19-4fb9-859a-2ffd49be6633 unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 4409c325-7a0e-4fd1-a602-b05fe5d2f808 result, different first party: 4409c325-7a0e-4fd1-a602-b05fe5d2f808 unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 01d42778-3975-4a75-a1e2-464880100b71 result, different first party: 01d42778-3975-4a75-a1e2-464880100b71 unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 76ff53c9-e4b6-445e-bb7b-5b32d9820a73 result, different first party: 76ff53c9-e4b6-445e-bb7b-5b32d9820a73 unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: a866563f-d4ac-4ce1-9105-1a1b580a52ae result, different first party: a866563f-d4ac-4ce1-9105-1a1b580a52ae unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: fd309849-c8ee-4e89-937c-81ceea438250 result, different first party: fd309849-c8ee-4e89-937c-81ceea438250 unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 3eb35128-c4e4-4d65-a4ac-3653e4e82782 result, different first party: 3eb35128-c4e4-4d65-a4ac-3653e4e82782 unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 2dff31ac-8fe2-4b16-b135-bed1cb7f7b20 result, different first party: 2dff31ac-8fe2-4b16-b135-bed1cb7f7b20 unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 57e06c53-1bba-4b4f-9773-a906cff928ce result, different first party: 57e06c53-1bba-4b4f-9773-a906cff928ce unsupported: false passed: false test failed: false
window.nameThe 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.
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 9a42305d-fa19-4fb9-859a-2ffd49be6633 result, different first party: unsupported: false passed: true test failed: false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 4409c325-7a0e-4fd1-a602-b05fe5d2f808 result, different first party: unsupported: false passed: true test failed: false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 01d42778-3975-4a75-a1e2-464880100b71 result, different first party: unsupported: false passed: true test failed: false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 76ff53c9-e4b6-445e-bb7b-5b32d9820a73 result, different first party: unsupported: false passed: true test failed: false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: a866563f-d4ac-4ce1-9105-1a1b580a52ae result, different first party: unsupported: false passed: true test failed: false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: fd309849-c8ee-4e89-937c-81ceea438250 result, different first party: unsupported: false passed: true test failed: false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 3eb35128-c4e4-4d65-a4ac-3653e4e82782 result, different first party: unsupported: false passed: true test failed: false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 2dff31ac-8fe2-4b16-b135-bed1cb7f7b20 result, different first party: unsupported: false passed: true test failed: false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 57e06c53-1bba-4b4f-9773-a906cff928ce result, different first party: unsupported: false passed: true test failed: false
HTTPS testsHTTPS 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 websiteChecks 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.
  passed: false result: Insecure website loaded
  passed: false result: Insecure website loaded
  passed: false result: Insecure website loaded
  passed: false result: Insecure website loaded
  passed: false result: Insecure website loaded
  passed: false result: Insecure website loaded
  passed: false result: Insecure website loaded
  passed: false result: Insecure website loaded
  passed: false result: Insecure website loaded
Upgradable addressChecks to see if an insecure address entered into the browser's address bar is upgraded to HTTPS whenever possible.
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
Upgradable hyperlinkChecks to see if the user has clicked on a hyperlink to an insecure address, if the browser upgrades that address to HTTPS whenever possible.
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
  upgraded: false passed: false
Upgradable imageChecks to see if the browser attempts to upgrade an insecure address for an image to HTTPS whenever possible.
  passed: false result: loaded insecurely
  passed: false result: loaded insecurely
  passed: false result: loaded insecurely
  passed: false result: loaded insecurely
  passed: false result: loaded insecurely
  passed: false result: loaded insecurely
  passed: false result: loaded insecurely
  passed: false result: loaded insecurely
  passed: false result: loaded insecurely
Upgradable scriptChecks to see if the browser attempts to upgrade an insecure address for an script to HTTPS whenever possible.
  passed: true result: blocked
  passed: true result: blocked
  passed: true result: blocked
  passed: true result: blocked
  passed: true result: blocked
  passed: true result: blocked
  passed: true result: blocked
  passed: true result: blocked
  passed: true result: blocked
Misc testsThis category includes tests for the presence of miscellaneous privacy features.
GPC enabled first-partyThe 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.
  header value: undefined passed: false
  header value: undefined passed: false
  header value: undefined passed: false
  header value: undefined passed: false
  header value: undefined passed: false
  header value: undefined passed: false
  header value: undefined passed: false
  header value: undefined passed: false
  header value: undefined passed: false
GPC enabled third-partyThe 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 to third-parties.
  passed: false
  passed: false
  passed: false
  passed: false
  passed: false
  passed: false
  passed: false
  passed: false
  passed: false
IP address leakIP addresses can be used to uniquely identify a large percentage of users. A proxy, VPN, or Tor can mask a user's IP address.
  passed: false
  passed: false
  passed: false
  passed: false
  passed: false
  passed: false
  passed: false
  passed: false
  passed: false
Stream isolationBrowsers that use Tor can use a different Tor circuit per top-level website.
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true readSameFirstParty: Error: Unsupported readDifferentFirstParty: Error: Unsupported testFailed: false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true readSameFirstParty: Error: Unsupported readDifferentFirstParty: Error: Unsupported testFailed: false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true readSameFirstParty: Error: Unsupported readDifferentFirstParty: Error: Unsupported testFailed: false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true readSameFirstParty: Error: Unsupported readDifferentFirstParty: Error: Unsupported testFailed: false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true readSameFirstParty: Error: Unsupported readDifferentFirstParty: Error: Unsupported testFailed: false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true readSameFirstParty: Error: Unsupported readDifferentFirstParty: Error: Unsupported testFailed: false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true readSameFirstParty: Error: Unsupported readDifferentFirstParty: Error: Unsupported testFailed: false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true readSameFirstParty: Error: Unsupported readDifferentFirstParty: Error: Unsupported testFailed: false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true readSameFirstParty: Error: Unsupported readDifferentFirstParty: Error: Unsupported testFailed: false
Tor enabledThe 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.
  IsTorExit: false passed: false
  IsTorExit: false passed: false
  IsTorExit: false passed: false
  IsTorExit: false passed: false
  IsTorExit: false passed: false
  IsTorExit: false passed: false
  IsTorExit: false passed: false
  IsTorExit: false passed: false
  IsTorExit: false passed: false
Fingerprinting resistance testsFingerprinting 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 heightHeight of the user's screen in pixels.
  expression: undefined desired expression: innerHeight actual value: 667 desired value: 1385 passed: false
  expression: undefined desired expression: innerHeight actual value: 667 desired value: 1445 passed: false
  expression: undefined desired expression: innerHeight actual value: 667 desired value: 1427 passed: false
  expression: undefined desired expression: innerHeight actual value: 667 desired value: 1453 passed: false
  expression: undefined desired expression: innerHeight actual value: 667 desired value: 1429 passed: false
  expression: undefined desired expression: innerHeight actual value: 667 desired value: 1429 passed: false
  expression: undefined desired expression: innerHeight actual value: 667 desired value: 1450 passed: false
  expression: undefined desired expression: innerHeight actual value: 667 desired value: 1432 passed: false
  expression: undefined desired expression: innerHeight actual value: 667 desired value: 1435 passed: false
Media query screen widthWidth of the user's screen in pixels.
  expression: undefined desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 375 desired value: 980 passed: false
outerHeightHeight of the browser window in pixels, including browser chrome.
  expression: outerHeight desired expression: innerHeight actual value: 530 desired value: 1385 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 667 desired value: 1445 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 546 desired value: 1427 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 556 desired value: 1453 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 547 desired value: 1429 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 547 desired value: 1429 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 555 desired value: 1450 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 667 desired value: 1432 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 667 desired value: 1435 passed: false
screen.heightHeight of the user's screen, in pixels.
  expression: screen.height desired expression: innerHeight actual value: 667 desired value: 1385 passed: false
  expression: screen.height desired expression: innerHeight actual value: 667 desired value: 1445 passed: false
  expression: screen.height desired expression: innerHeight actual value: 667 desired value: 1427 passed: false
  expression: screen.height desired expression: innerHeight actual value: 667 desired value: 1453 passed: false
  expression: screen.height desired expression: innerHeight actual value: 667 desired value: 1429 passed: false
  expression: screen.height desired expression: innerHeight actual value: 667 desired value: 1429 passed: false
  expression: screen.height desired expression: innerHeight actual value: 667 desired value: 1450 passed: false
  expression: screen.height desired expression: innerHeight actual value: 667 desired value: 1432 passed: false
  expression: screen.height desired expression: innerHeight actual value: 667 desired value: 1435 passed: false
screen.widthWidth of the user's screen, in pixels.
  expression: screen.width desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 375 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 375 desired value: 980 passed: false
screenXPosition, in pixels, of the left edge of the browser window on screen.
  expression: screenX desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenX desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenX desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenX desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenX desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenX desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenX desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenX desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenX desired expression: 0 actual value: 0 desired value: 0 passed: true
screenYPosition, in pixels, of the top edge of the browser window on screen.
  expression: screenY desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenY desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenY desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenY desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenY desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenY desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenY desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenY desired expression: 0 actual value: 0 desired value: 0 passed: true
  expression: screenY desired expression: 0 actual value: 0 desired value: 0 passed: true
Tracking query parameter testsWhen 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.)
__hsfpHubSpot tracking parameter
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
__hsscHubSpot tracking parameter
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
__hstcHubSpot tracking parameter
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
__sDrip.com email address tracking parameter
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
_hsencHubSpot tracking parameter
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
_openstatYandex tracking parameter
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
dclidDoubleClick Click ID (Google)
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
fbclidFacebook Click Identifier
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
gclidGoogle Click Identifier
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
hsCtaTrackingHubSpot tracking parameter
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
igshidInstagram tracking parameter
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
mc_eidMailchimp Email ID (email recipient's address)
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
mkt_tokAdobe Marketo tracking parameter
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
ml_subscriberMailerLite email tracking
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
ml_subscriber_hashMailerLite email tracking
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
msclkidMicrosoft Click ID
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
oly_anon_idOmeda marketing 'anonymous' customer id
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
oly_enc_idOmeda marketing 'known' customer id
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
rb_clickidUnknown high-entropy tracking parameter
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
s_cidAdobe Site Catalyst tracking parameter
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
vero_convVero tracking parameter
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
vero_idVero tracking parameter
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
wickedidWicked Reports e-commerce tracking
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
yclidYandex Click ID
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
  value: 927035954739361 passed: false
Tracker content blockingWhen 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, as reported by https://whotracks.me.
AdobeTests whether the browser blocks the page from loading the tracker at https://munchkin.marketo.net/munchkin.js
  url: https://munchkin.marketo.net/munchkin.js passed: true
  url: https://munchkin.marketo.net/munchkin.js passed: false
  url: https://munchkin.marketo.net/munchkin.js passed: true
  url: https://munchkin.marketo.net/munchkin.js passed: false
  url: https://munchkin.marketo.net/munchkin.js passed: false
  url: https://munchkin.marketo.net/munchkin.js passed: true
  url: https://munchkin.marketo.net/munchkin.js passed: false
  url: https://munchkin.marketo.net/munchkin.js passed: false
  url: https://munchkin.marketo.net/munchkin.js passed: false
Amazon adsystemTests whether the browser blocks the page from loading the tracker at https://aax-us-east.amazon-adsystem.com/x/px
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: true
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: true
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: true
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false
AppNextTests whether the browser blocks the page from loading the tracker at https://acdn.adnxs.com/dmp/up/pixie.js
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: true
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: true
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: true
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false
Bing AdsTests whether the browser blocks the page from loading the tracker at https://bat.bing.com/bat.js
  url: https://bat.bing.com/bat.js passed: true
  url: https://bat.bing.com/bat.js passed: false
  url: https://bat.bing.com/bat.js passed: false
  url: https://bat.bing.com/bat.js passed: false
  url: https://bat.bing.com/bat.js passed: false
  url: https://bat.bing.com/bat.js passed: false
  url: https://bat.bing.com/bat.js passed: false
  url: https://bat.bing.com/bat.js passed: false
  url: https://bat.bing.com/bat.js passed: false
ChartbeatTests whether the browser blocks the page from loading the tracker at https://pdev.chartbeat.net/ping?h=x&p=x&r=&b=
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: true
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: true
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false
CriteoTests whether the browser blocks the page from loading the tracker at https://csm.da.us.criteo.net/iev
  url: https://csm.da.us.criteo.net/iev passed: true
  url: https://csm.da.us.criteo.net/iev passed: false
  url: https://csm.da.us.criteo.net/iev passed: true
  url: https://csm.da.us.criteo.net/iev passed: false
  url: https://csm.da.us.criteo.net/iev passed: false
  url: https://csm.da.us.criteo.net/iev passed: true
  url: https://csm.da.us.criteo.net/iev passed: false
  url: https://csm.da.us.criteo.net/iev passed: false
  url: https://csm.da.us.criteo.net/iev passed: false
DoubleClick (Google)Tests whether the browser blocks the page from loading the tracker at https://securepubads.g.doubleclick.net/static/glade.js
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: true
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: true
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: true
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false
Facebook PixelTests whether the browser blocks the page from loading the tracker at https://www.facebook.com/tr?id=123
  url: https://www.facebook.com/tr?id=123 passed: true
  url: https://www.facebook.com/tr?id=123 passed: false
  url: https://www.facebook.com/tr?id=123 passed: true
  url: https://www.facebook.com/tr?id=123 passed: false
  url: https://www.facebook.com/tr?id=123 passed: false
  url: https://www.facebook.com/tr?id=123 passed: true
  url: https://www.facebook.com/tr?id=123 passed: false
  url: https://www.facebook.com/tr?id=123 passed: false
  url: https://www.facebook.com/tr?id=123 passed: false
Google Ad ServicesTests whether the browser blocks the page from loading the tracker at https://www.googleadservices.com/pagead/conversion.js
  url: https://www.googleadservices.com/pagead/conversion.js passed: true
  url: https://www.googleadservices.com/pagead/conversion.js passed: false
  url: https://www.googleadservices.com/pagead/conversion.js passed: true
  url: https://www.googleadservices.com/pagead/conversion.js passed: false
  url: https://www.googleadservices.com/pagead/conversion.js passed: false
  url: https://www.googleadservices.com/pagead/conversion.js passed: true
  url: https://www.googleadservices.com/pagead/conversion.js passed: false
  url: https://www.googleadservices.com/pagead/conversion.js passed: false
  url: https://www.googleadservices.com/pagead/conversion.js passed: false
Google AnalyticsTests whether the browser blocks the page from loading the tracker at https://google-analytics.com/urchin.js
  url: https://google-analytics.com/urchin.js passed: true
  url: https://google-analytics.com/urchin.js passed: false
  url: https://google-analytics.com/urchin.js passed: true
  url: https://google-analytics.com/urchin.js passed: false
  url: https://google-analytics.com/urchin.js passed: false
  url: https://google-analytics.com/urchin.js passed: true
  url: https://google-analytics.com/urchin.js passed: false
  url: https://google-analytics.com/urchin.js passed: false
  url: https://google-analytics.com/urchin.js passed: false
Google SyndicationTests whether the browser blocks the page from loading the tracker at https://tpc.googlesyndication.com/sodar/UFYwWwmt.js
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: true
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: true
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: true
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false
Google Tag ManagerTests whether the browser blocks the page from loading the tracker at https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: true
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: true
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false
Index ExchangeTests 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
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: true
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: true
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: true
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false
New RelicTests whether the browser blocks the page from loading the tracker at https://js-agent.newrelic.com/nr-1212.min.js
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: true
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: true
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: true
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false
QuantcastTests whether the browser blocks the page from loading the tracker at https://pixel.quantserve.com/pixel
  url: https://pixel.quantserve.com/pixel passed: true
  url: https://pixel.quantserve.com/pixel passed: false
  url: https://pixel.quantserve.com/pixel passed: true
  url: https://pixel.quantserve.com/pixel passed: false
  url: https://pixel.quantserve.com/pixel passed: false
  url: https://pixel.quantserve.com/pixel passed: true
  url: https://pixel.quantserve.com/pixel passed: false
  url: https://pixel.quantserve.com/pixel passed: false
  url: https://pixel.quantserve.com/pixel passed: false
Scorecard Research BeaconTests whether the browser blocks the page from loading the tracker at https://sb.scorecardresearch.com/internal-c2/default/cs.js
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: true
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: true
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: true
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false
TaboolaTests whether the browser blocks the page from loading the tracker at https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: true
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: true
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: true
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false
Twitter AdsTests whether the browser blocks the page from loading the tracker at https://static.ads-twitter.com/uwt.js
  url: https://static.ads-twitter.com/uwt.js passed: true
  url: https://static.ads-twitter.com/uwt.js passed: false
  url: https://static.ads-twitter.com/uwt.js passed: false
  url: https://static.ads-twitter.com/uwt.js passed: false
  url: https://static.ads-twitter.com/uwt.js passed: false
  url: https://static.ads-twitter.com/uwt.js passed: true
  url: https://static.ads-twitter.com/uwt.js passed: false
  url: https://static.ads-twitter.com/uwt.js passed: false
  url: https://static.ads-twitter.com/uwt.js passed: false
Yandex AdsTests whether the browser blocks the page from loading the tracker at https://yandex.ru/ads/system/header-bidding.js
  url: https://yandex.ru/ads/system/header-bidding.js passed: true
  url: https://yandex.ru/ads/system/header-bidding.js passed: false
  url: https://yandex.ru/ads/system/header-bidding.js passed: true
  url: https://yandex.ru/ads/system/header-bidding.js passed: false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false
Yandex MetrikaTests whether the browser blocks the page from loading the tracker at https://mc.yandex.ru/metrika/tag.js
  url: https://mc.yandex.ru/metrika/tag.js passed: true
  url: https://mc.yandex.ru/metrika/tag.js passed: false
  url: https://mc.yandex.ru/metrika/tag.js passed: true
  url: https://mc.yandex.ru/metrika/tag.js passed: false
  url: https://mc.yandex.ru/metrika/tag.js passed: false
  url: https://mc.yandex.ru/metrika/tag.js passed: true
  url: https://mc.yandex.ru/metrika/tag.js passed: false
  url: https://mc.yandex.ru/metrika/tag.js passed: false
  url: https://mc.yandex.ru/metrika/tag.js passed: false