Android Browsers
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brave
1.33

bromite
96.0

chrome
96.0

duckduckgo
5.106

edge
96.0

firefox
95.2

samsung
16.0

tor
10.5

vivaldi
5.0

yandex
21.11
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: h3 result, different first party: h2 unsupported: false passed: true 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: h3 result, different first party: h2 unsupported: false passed: true 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: h3 result, different first party: h3 unsupported: false passed: false 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: h3 result, different first party: h3 unsupported: false passed: false 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: h3 result, different first party: h3 unsupported: false passed: false 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: h3 result, different first party: h2 unsupported: false passed: true 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: h3 result, different first party: h3 unsupported: false passed: false 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: h3 result, different first party: h3 unsupported: false passed: false 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd result, different first party: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd unsupported: false passed: false test failed: false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 30f8de99-6c88-4bed-8895-9afbea5a035d result, different first party: 30f8de99-6c88-4bed-8895-9afbea5a035d 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 8dc8f979-65c3-4928-ab25-4b166808f056 result, different first party: 8dc8f979-65c3-4928-ab25-4b166808f056 unsupported: false passed: false test failed: false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 3d735315-2822-4e0b-9739-0a7e19cf44e9 result, different first party: 3d735315-2822-4e0b-9739-0a7e19cf44e9 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b result, different first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b unsupported: false passed: false test failed: false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: acff6865-462a-4045-8bc2-b67021abdc4a result, different first party: acff6865-462a-4045-8bc2-b67021abdc4a 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 71e4558d-098a-4ab7-9794-aac215454720 result, different first party: 71e4558d-098a-4ab7-9794-aac215454720 unsupported: false passed: false test failed: false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: fcbbec22-a1ba-4399-807f-b7d78b5833d6 result, different first party: Error: NetworkError when attempting to fetch resource. unsupported: false passed: true 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 result, different first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 unsupported: false passed: false test failed: false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 1744f996-4066-42fe-8d61-09fcff61d032 result, different first party: 1744f996-4066-42fe-8d61-09fcff61d032 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: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd result, different first party: Error: no BroadcastChannel message unsupported: false passed: true 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: 30f8de99-6c88-4bed-8895-9afbea5a035d result, different first party: 30f8de99-6c88-4bed-8895-9afbea5a035d unsupported: false passed: false 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: 8dc8f979-65c3-4928-ab25-4b166808f056 result, different first party: 8dc8f979-65c3-4928-ab25-4b166808f056 unsupported: false passed: false 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: 3d735315-2822-4e0b-9739-0a7e19cf44e9 result, different first party: 3d735315-2822-4e0b-9739-0a7e19cf44e9 unsupported: false passed: false 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: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b result, different first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b unsupported: false passed: false 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: acff6865-462a-4045-8bc2-b67021abdc4a result, different first party: acff6865-462a-4045-8bc2-b67021abdc4a unsupported: false passed: false 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: 71e4558d-098a-4ab7-9794-aac215454720 result, different first party: 71e4558d-098a-4ab7-9794-aac215454720 unsupported: false passed: false 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: fcbbec22-a1ba-4399-807f-b7d78b5833d6 result, different first party: Error: The operation is insecure. unsupported: false passed: true 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: 48c9f8fb-11db-48bf-971e-c1f5896ed420 result, different first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 unsupported: false passed: false 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: 1744f996-4066-42fe-8d61-09fcff61d032 result, different first party: 1744f996-4066-42fe-8d61-09fcff61d032 unsupported: false passed: false 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: db4a4976-3f4b-4464-b035-3cb96987017f result, different first party: Error: An attempt was made to break through the security policy of the user agent. unsupported: false passed: true test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: cfc23bc0-1b50-454a-bd4b-4faa79e27282 result, different first party: Error: An attempt was made to break through the security policy of the user agent. unsupported: false passed: true test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: fb760fe6-3247-43d9-a7e5-dae8b1914e2b result, different first party: fb760fe6-3247-43d9-a7e5-dae8b1914e2b unsupported: false passed: false test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 8431696f-e29e-42c3-8dde-cdd4f3269edc result, different first party: 8431696f-e29e-42c3-8dde-cdd4f3269edc unsupported: false passed: false test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 73ff56ac-8f2c-4879-861c-16d226e63916 result, different first party: 73ff56ac-8f2c-4879-861c-16d226e63916 unsupported: false passed: false test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a result, different first party: dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a unsupported: false passed: false test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: ec45e5be-a09a-4677-9e6e-714e2a54cbc8 result, different first party: ec45e5be-a09a-4677-9e6e-714e2a54cbc8 unsupported: false passed: false test failed: false
write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: Error: The operation is insecure. result, different first party: Error: The operation is insecure. unsupported: true passed: undefined test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e result, different first party: 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e unsupported: false passed: false test failed: false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: eb7f7982-e3be-4457-a7eb-f90fd25bbaf4 result, different first party: eb7f7982-e3be-4457-a7eb-f90fd25bbaf4 unsupported: false passed: false 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=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 30f8de99-6c88-4bed-8895-9afbea5a035d 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=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 8dc8f979-65c3-4928-ab25-4b166808f056 result, different first party: 8dc8f979-65c3-4928-ab25-4b166808f056 unsupported: false passed: false test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 3d735315-2822-4e0b-9739-0a7e19cf44e9 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=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b result, different first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b unsupported: false passed: false test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: acff6865-462a-4045-8bc2-b67021abdc4a result, different first party: acff6865-462a-4045-8bc2-b67021abdc4a unsupported: false passed: false test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 71e4558d-098a-4ab7-9794-aac215454720 result, different first party: 71e4558d-098a-4ab7-9794-aac215454720 unsupported: false passed: false test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: fcbbec22-a1ba-4399-807f-b7d78b5833d6 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=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 result, different first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 unsupported: false passed: false test failed: false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 1744f996-4066-42fe-8d61-09fcff61d032 result, different first party: 1744f996-4066-42fe-8d61-09fcff61d032 unsupported: false passed: false 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_38760545222164344 result, different first party: fake_2882495102137186 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_8659258098507714 result, different first party: fake_9129589127262292 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_6189722697484341 result, different first party: fake_6189722697484341 unsupported: false passed: false 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_4230883126341334 result, different first party: fake_4230883126341334 unsupported: false passed: false 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_929956408848279 result, different first party: fake_929956408848279 unsupported: false passed: false 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_04180783462937909 result, different first party: fake_41679659814076 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_05666189271504929 result, different first party: fake_05666189271504929 unsupported: false passed: false 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_8042125244754517 result, different first party: fake_5169831306310775 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_17890983114020553 result, different first party: fake_17890983114020553 unsupported: false passed: false 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_008862111242949444 result, different first party: fake_6295547860566244 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: 2 unsupported: false passed: true 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: 2 unsupported: false passed: true 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
  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
  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: 2 unsupported: false passed: true 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: 1 result, different first party: 2 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: 1 result, different first party: 2 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: 1 result, different first party: 2 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: 1 result, different first party: 1 unsupported: false passed: false 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: 1 result, different first party: 2 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: 1 result, different first party: 2 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: 1 result, different first party: 1 unsupported: false passed: false 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: 1 result, different first party: 2 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: 1 result, different first party: 2 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: 1 result, different first party: 2 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: 1 unsupported: false passed: false 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: 1 unsupported: false passed: false 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: 1 unsupported: false passed: false 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: 1 unsupported: false passed: false 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: 1 unsupported: false passed: false 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: 30f8de99-6c88-4bed-8895-9afbea5a035d result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 8dc8f979-65c3-4928-ab25-4b166808f056 result, different first party: 8dc8f979-65c3-4928-ab25-4b166808f056 unsupported: false passed: false test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: 3d735315-2822-4e0b-9739-0a7e19cf44e9 result, different first party: 3d735315-2822-4e0b-9739-0a7e19cf44e9 unsupported: false passed: false test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b result, different first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b unsupported: false passed: false test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: acff6865-462a-4045-8bc2-b67021abdc4a result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 71e4558d-098a-4ab7-9794-aac215454720 result, different first party: 71e4558d-098a-4ab7-9794-aac215454720 unsupported: false passed: false test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: fcbbec22-a1ba-4399-807f-b7d78b5833d6 result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 result, different first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 unsupported: false passed: false test failed: false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: 1744f996-4066-42fe-8d61-09fcff61d032 result, different first party: 1744f996-4066-42fe-8d61-09fcff61d032 unsupported: false passed: false 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 30f8de99-6c88-4bed-8895-9afbea5a035d result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 8dc8f979-65c3-4928-ab25-4b166808f056 result, different first party: 8dc8f979-65c3-4928-ab25-4b166808f056 unsupported: false passed: false test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 3d735315-2822-4e0b-9739-0a7e19cf44e9 result, different first party: 3d735315-2822-4e0b-9739-0a7e19cf44e9 unsupported: false passed: false test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b result, different first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b unsupported: false passed: false test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: acff6865-462a-4045-8bc2-b67021abdc4a result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 71e4558d-098a-4ab7-9794-aac215454720 result, different first party: 71e4558d-098a-4ab7-9794-aac215454720 unsupported: false passed: false test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: fcbbec22-a1ba-4399-807f-b7d78b5833d6 result, different first party: unsupported: false passed: true test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 result, different first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 unsupported: false passed: false test failed: false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 1744f996-4066-42fe-8d61-09fcff61d032 result, different first party: 1744f996-4066-42fe-8d61-09fcff61d032 unsupported: false passed: false 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: 46cdac31b594ede6accafad91d80dcb7 result, different first party: c180f4d92a217158fe0fd675cd97b6b2 unsupported: false passed: true 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: 053336f4c84be1784a85b140e8140272 result, different first party: e3b5f19ed74712f35b7322b09f57b95a unsupported: false passed: true 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: 82d15b587a3b4ac516c9a9d6d5f9046d result, different first party: 82d15b587a3b4ac516c9a9d6d5f9046d unsupported: false passed: false 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: 93eb623523a3359d67e6f126168b09bf result, different first party: 93eb623523a3359d67e6f126168b09bf unsupported: false passed: false 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: 4ed0556bfc03e37e03f2acf649044080 result, different first party: 4ed0556bfc03e37e03f2acf649044080 unsupported: false passed: false 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: 7496e4b47dac4b2b5e00ec73bdbcd4a6 result, different first party: 1ed3c3399e9a019530610a3cb568b0cb unsupported: false passed: true 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: 806b1aa4725f4a1ab2886784c5a4c6a5 result, different first party: 806b1aa4725f4a1ab2886784c5a4c6a5 unsupported: false passed: false 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: 8fa96151774621b9ba715c5ba9f1ccfa result, different first party: 8fa96151774621b9ba715c5ba9f1ccfa unsupported: false passed: false 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: set HSTS flag read: read HSTS flag result, same first party: not tested result, different first party: Upgraded to https unsupported: false passed: false test failed: false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested result, different first party: Upgraded to https unsupported: false passed: false test failed: false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested result, different first party: Upgraded to https unsupported: false passed: false test failed: false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested result, different first party: Upgraded to https unsupported: false passed: false test failed: false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested result, different first party: Upgraded to https unsupported: false passed: false test failed: false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested result, different first party: Used http unsupported: false passed: true test failed: false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested result, different first party: Upgraded to https unsupported: false passed: false test failed: false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested result, different first party: Used http unsupported: false passed: true test failed: false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested result, different first party: Upgraded to https unsupported: false passed: false test failed: false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested result, different first party: Upgraded to https unsupported: false passed: false 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: 1 unsupported: false passed: false 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: 1 unsupported: false passed: false 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: 1 unsupported: false passed: false 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: 1 unsupported: false passed: false 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: 1 unsupported: false passed: false 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: 1 unsupported: false passed: false 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: 1 unsupported: false passed: false 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: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd result, different first party: Error: The user denied permission to access the database. 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: 30f8de99-6c88-4bed-8895-9afbea5a035d result, different first party: Error: The user denied permission to access the database. 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: 8dc8f979-65c3-4928-ab25-4b166808f056 result, different first party: 8dc8f979-65c3-4928-ab25-4b166808f056 unsupported: false passed: false 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: 3d735315-2822-4e0b-9739-0a7e19cf44e9 result, different first party: 3d735315-2822-4e0b-9739-0a7e19cf44e9 unsupported: false passed: false 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: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b result, different first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b unsupported: false passed: false 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: acff6865-462a-4045-8bc2-b67021abdc4a result, different first party: acff6865-462a-4045-8bc2-b67021abdc4a unsupported: false passed: false 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: 71e4558d-098a-4ab7-9794-aac215454720 result, different first party: 71e4558d-098a-4ab7-9794-aac215454720 unsupported: false passed: false 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: Error: A mutation operation was attempted on a database that did not allow mutations. result, different first party: Error: The operation is insecure. unsupported: true passed: undefined 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: 48c9f8fb-11db-48bf-971e-c1f5896ed420 result, different first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 unsupported: false passed: false 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: 1744f996-4066-42fe-8d61-09fcff61d032 result, different first party: 1744f996-4066-42fe-8d61-09fcff61d032 unsupported: false passed: false 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: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd 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: 30f8de99-6c88-4bed-8895-9afbea5a035d result, different first party: Error: Failed to read the 'localStorage' property from 'Window': Access is denied for this document. unsupported: false passed: true test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 8dc8f979-65c3-4928-ab25-4b166808f056 result, different first party: 8dc8f979-65c3-4928-ab25-4b166808f056 unsupported: false passed: false test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 3d735315-2822-4e0b-9739-0a7e19cf44e9 result, different first party: 3d735315-2822-4e0b-9739-0a7e19cf44e9 unsupported: false passed: false test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b result, different first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b unsupported: false passed: false test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: acff6865-462a-4045-8bc2-b67021abdc4a result, different first party: acff6865-462a-4045-8bc2-b67021abdc4a unsupported: false passed: false test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 71e4558d-098a-4ab7-9794-aac215454720 result, different first party: 71e4558d-098a-4ab7-9794-aac215454720 unsupported: false passed: false test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: fcbbec22-a1ba-4399-807f-b7d78b5833d6 result, different first party: Error: The operation is insecure. unsupported: false passed: true test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 result, different first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 unsupported: false passed: false test failed: false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 1744f996-4066-42fe-8d61-09fcff61d032 result, different first party: 1744f996-4066-42fe-8d61-09fcff61d032 unsupported: false passed: false 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: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd result, different first party: Error: Failed to execute 'query' on 'LockManager': Access to the Locks API is denied in this context. unsupported: false passed: true 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: 30f8de99-6c88-4bed-8895-9afbea5a035d result, different first party: Error: Failed to execute 'query' on 'LockManager': Access to the Locks API is denied in this context. unsupported: false passed: true 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: 8dc8f979-65c3-4928-ab25-4b166808f056 result, different first party: 8dc8f979-65c3-4928-ab25-4b166808f056 unsupported: false passed: false 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: 3d735315-2822-4e0b-9739-0a7e19cf44e9 result, different first party: 3d735315-2822-4e0b-9739-0a7e19cf44e9 unsupported: false passed: false 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: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b result, different first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b unsupported: false passed: false 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: 71e4558d-098a-4ab7-9794-aac215454720 result, different first party: 71e4558d-098a-4ab7-9794-aac215454720 unsupported: false passed: false 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: 48c9f8fb-11db-48bf-971e-c1f5896ed420 result, different first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 unsupported: false passed: false 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: 1744f996-4066-42fe-8d61-09fcff61d032 result, different first party: 1744f996-4066-42fe-8d61-09fcff61d032 unsupported: false passed: false 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: 1 result, different first party: 2 unsupported: false passed: true 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: 1 result, different first party: 2 unsupported: false passed: true 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: 1 result, different first party: 1 unsupported: false passed: false 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: 1 result, different first party: 1 unsupported: false passed: false 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: 1 result, different first party: 1 unsupported: false passed: false 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: 1 result, different first party: 2 unsupported: false passed: true 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: 1 result, different first party: 1 unsupported: false passed: false 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: 1 result, different first party: 2 unsupported: false passed: true 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: 1 result, different first party: 1 unsupported: false passed: false 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: 1 result, different first party: 2 unsupported: false passed: true 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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd result, different first party: Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker. unsupported: false passed: true test failed: false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: 30f8de99-6c88-4bed-8895-9afbea5a035d result, different first party: Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker. 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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 8dc8f979-65c3-4928-ab25-4b166808f056 result, different first party: 8dc8f979-65c3-4928-ab25-4b166808f056 unsupported: false passed: false test failed: false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: 3d735315-2822-4e0b-9739-0a7e19cf44e9 result, different first party: 3d735315-2822-4e0b-9739-0a7e19cf44e9 unsupported: false passed: false 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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b result, different first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b unsupported: false passed: false test failed: false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: acff6865-462a-4045-8bc2-b67021abdc4a result, different first party: acff6865-462a-4045-8bc2-b67021abdc4a unsupported: false passed: false 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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 71e4558d-098a-4ab7-9794-aac215454720 result, different first party: 71e4558d-098a-4ab7-9794-aac215454720 unsupported: false passed: false test failed: false
write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: Error: navigator.serviceWorker is undefined result, different first party: Error: navigator.serviceWorker is undefined unsupported: true passed: undefined 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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 result, different first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 unsupported: false passed: false test failed: false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: 1744f996-4066-42fe-8d61-09fcff61d032 result, different first party: 1744f996-4066-42fe-8d61-09fcff61d032 unsupported: false passed: false 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: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined 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: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined 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: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined 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: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined 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: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined 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: acff6865-462a-4045-8bc2-b67021abdc4a result, different first party: acff6865-462a-4045-8bc2-b67021abdc4a unsupported: false passed: false 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: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined 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: fcbbec22-a1ba-4399-807f-b7d78b5833d6 result, different first party: Error: The operation is insecure. unsupported: false passed: true 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: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined 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: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined 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: dd152a32e4b6b9a53ff763de939962e0db75c2bdd1b966a80f22b295e8512692 result, different first party: 0430b828e8cf071be02cde83d77bf1082c3358a332ccab2100d57aa60b88f6ea 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: 8e0e6f800db7a940f0d3d8a679864652d94cbb33dcf5eae0577f7864ee17e964 result, different first party: 04301251da8dab527c20f12a885b42247be761c04b29e3e1591a79d2e25fcd9e 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: 9a426bb642ef39e7925820fc19df54b9b610aa03fbcbcbce7eb9cb9cb4cafa4a result, different first party: 85ffb50c256b44095d0b01c1c276ec7c240c6894a6e151eac4a06f823821491e 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: 06bea4ae697e35bb6b0c97e7f9427bcca13adcd150effabe3c5e07db0fbbb379 result, different first party: 3920c55a7d9b0d1f1a2f0663846c32cf15593ccee7000f0f272fb2d3b7682d7a 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: 221749505f098961d118b1608152327b6ca0b4c4d8dc0f3e80269af24e40cb13 result, different first party: 449464010a7a39fe517c9ffb5f8f597a9b06a04eb5ae2dae72691d683292053b 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: a4a66259451eed02ca19e0292d2bd46717d24d503e057fc8d881dbcf04345591 result, different first party: 043037aa9bf31d37557b882c5586dd00e7c621763ae3a71188a3b09a77834683 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: 1252e493c3ad54d4db6643ea42c52b604effe602d039cee3bcfddb88f65d3dd3 result, different first party: 7724bba1327fd3dcb0ce8a3908abaec8bb93451ca591b071413a7b8032579216 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: eb3c5173f4c465f2694412b0a08e3f3bce0df4820dcc5fab67fab20f9f23b672 result, different first party: 946153f6d746d88797970fb8931c8551323445bf56d7f3cce1b8bfbb9e4e2145 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: ee62fc2f1e825284b11c92707dfc763ddd59866d92ea3a1e3687dad792d3784f result, different first party: 567f400d28c260b04c04d9e6d3f27dda44dc38a820e9367619c39302e653cb11 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: be758baf53ff01d8f6cabfd8641dcfba7c920b0184dfb31c979a49718c9fc928 result, different first party: 534803c16daaf82b6d45af93f6bc7651d78e6635cf8c409c4fec445a37819ee5 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: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd result, different first party: Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts. unsupported: false passed: true 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: 30f8de99-6c88-4bed-8895-9afbea5a035d result, different first party: Error: An attempt was made to break through the security policy of the user agent. unsupported: false passed: true 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: 8dc8f979-65c3-4928-ab25-4b166808f056 result, different first party: 8dc8f979-65c3-4928-ab25-4b166808f056 unsupported: false passed: false 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: window.openDatabase is not a function result, different first party: Error: window.openDatabase is not a function 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: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b result, different first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b unsupported: false passed: false 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: window.openDatabase is not a function result, different first party: Error: window.openDatabase is not a function 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: 71e4558d-098a-4ab7-9794-aac215454720 result, different first party: 71e4558d-098a-4ab7-9794-aac215454720 unsupported: false passed: false 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: window.openDatabase is not a function result, different first party: Error: window.openDatabase is not a function 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: 48c9f8fb-11db-48bf-971e-c1f5896ed420 result, different first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 unsupported: false passed: false 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: 1744f996-4066-42fe-8d61-09fcff61d032 result, different first party: 1744f996-4066-42fe-8d61-09fcff61d032 unsupported: false passed: false 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: Fri, 31 Dec 2021 19:18:02 GMT result, different first party: Fri, 24 Dec 2021 05:34:32 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: Fri, 31 Dec 2021 19:21:18 GMT result, different first party: Mon, 27 Dec 2021 01:43:27 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: Fri, 31 Dec 2021 19:10:41 GMT result, different first party: Fri, 24 Dec 2021 05:27:30 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: Fri, 31 Dec 2021 19:08:24 GMT result, different first party: Fri, 31 Dec 2021 19:08:24 GMT unsupported: false passed: false 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: Fri, 31 Dec 2021 19:07:23 GMT result, different first party: Fri, 24 Dec 2021 05:13:08 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: Fri, 31 Dec 2021 19:09:33 GMT result, different first party: Fri, 31 Dec 2021 18:45:05 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: Fri, 31 Dec 2021 19:19:14 GMT result, different first party: Fri, 31 Dec 2021 19:19:14 GMT unsupported: false passed: false 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: Fri, 31 Dec 2021 19:04:13 GMT result, different first party: Fri, 31 Dec 2021 19:04:41 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: Fri, 31 Dec 2021 19:16:54 GMT result, different first party: Fri, 24 Dec 2021 05:28:50 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: Fri, 31 Dec 2021 19:20:21 GMT result, different first party: Fri, 24 Dec 2021 05:30:58 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
  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: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 30f8de99-6c88-4bed-8895-9afbea5a035d result, different first party: Error: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document. unsupported: false passed: true test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 8dc8f979-65c3-4928-ab25-4b166808f056 result, different first party: 8dc8f979-65c3-4928-ab25-4b166808f056 unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 3d735315-2822-4e0b-9739-0a7e19cf44e9 result, different first party: 3d735315-2822-4e0b-9739-0a7e19cf44e9 unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b result, different first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: acff6865-462a-4045-8bc2-b67021abdc4a result, different first party: acff6865-462a-4045-8bc2-b67021abdc4a unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 71e4558d-098a-4ab7-9794-aac215454720 result, different first party: 71e4558d-098a-4ab7-9794-aac215454720 unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: fcbbec22-a1ba-4399-807f-b7d78b5833d6 result, different first party: null unsupported: false passed: true test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 result, different first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 unsupported: false passed: false test failed: false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 1744f996-4066-42fe-8d61-09fcff61d032 result, different first party: 1744f996-4066-42fe-8d61-09fcff61d032 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: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd result, different first party: 90a884aa-3b39-4081-87f9-3a6e37d0e3dd unsupported: false passed: false 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: 30f8de99-6c88-4bed-8895-9afbea5a035d result, different first party: 30f8de99-6c88-4bed-8895-9afbea5a035d unsupported: false passed: false 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: 8dc8f979-65c3-4928-ab25-4b166808f056 result, different first party: 8dc8f979-65c3-4928-ab25-4b166808f056 unsupported: false passed: false 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: 3d735315-2822-4e0b-9739-0a7e19cf44e9 result, different first party: 3d735315-2822-4e0b-9739-0a7e19cf44e9 unsupported: false passed: false 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: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b result, different first party: 1a1caffc-3e69-4f2b-9934-ff7a3fbdd80b unsupported: false passed: false 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: acff6865-462a-4045-8bc2-b67021abdc4a 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: 71e4558d-098a-4ab7-9794-aac215454720 result, different first party: 71e4558d-098a-4ab7-9794-aac215454720 unsupported: false passed: false 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: fcbbec22-a1ba-4399-807f-b7d78b5833d6 result, different first party: fcbbec22-a1ba-4399-807f-b7d78b5833d6 unsupported: false passed: false 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: 48c9f8fb-11db-48bf-971e-c1f5896ed420 result, different first party: 48c9f8fb-11db-48bf-971e-c1f5896ed420 unsupported: false passed: false 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: 1744f996-4066-42fe-8d61-09fcff61d032 result, different first party: 1744f996-4066-42fe-8d61-09fcff61d032 unsupported: false passed: false 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
  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: true passed: true
  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: true passed: true
  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: true result: upgraded
  passed: true result: upgraded
  passed: true result: upgraded
  passed: false result: loaded insecurely
  passed: true result: upgraded
  passed: false result: loaded insecurely
  passed: true result: upgraded
  passed: false result: loaded insecurely
  passed: true result: upgraded
  passed: true result: upgraded
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
  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: 1 passed: true
  header value: undefined passed: false
  header value: undefined passed: false
  header value: 1 passed: true
  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.
  sec-gpc: 1 passed: true
  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: true
  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: false readSameFirstParty: 2a0b:f4c0:16c:3::1 readDifferentFirstParty: 46.166.139.111 passed: true 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: true passed: true
  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: 640 desired value: 1263 passed: false
  expression: undefined desired expression: innerHeight actual value: 640 desired value: 1524 passed: false
  expression: undefined desired expression: innerHeight actual value: 640 desired value: 1394 passed: false
  expression: undefined desired expression: innerHeight actual value: 640 desired value: 1677 passed: false
  expression: undefined desired expression: innerHeight actual value: 640 desired value: 1394 passed: false
  expression: undefined desired expression: innerHeight actual value: 640 desired value: 1524 passed: false
  expression: undefined desired expression: innerHeight actual value: 640 desired value: 1416 passed: false
  expression: undefined desired expression: innerHeight actual value: undefined desired value: 1524 passed: false
  expression: undefined desired expression: innerHeight actual value: 640 desired value: 1285 passed: false
  expression: undefined desired expression: innerHeight actual value: 640 desired value: 1416 passed: false
Media query screen widthWidth of the user's screen in pixels.
  expression: undefined desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 980 desired value: 980 passed: true
  expression: undefined desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: undefined desired expression: innerWidth actual value: 360 desired value: 980 passed: false
outerHeightHeight of the browser window in pixels, including browser chrome.
  expression: outerHeight desired expression: innerHeight actual value: 464 desired value: 1263 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 560 desired value: 1524 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 512 desired value: 1394 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 616 desired value: 1677 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 512 desired value: 1394 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 616 desired value: 1524 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 520 desired value: 1416 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 1524 desired value: 1524 passed: true
  expression: outerHeight desired expression: innerHeight actual value: 472 desired value: 1285 passed: false
  expression: outerHeight desired expression: innerHeight actual value: 520 desired value: 1416 passed: false
screen.heightHeight of the user's screen, in pixels.
  expression: screen.height desired expression: innerHeight actual value: 640 desired value: 1263 passed: false
  expression: screen.height desired expression: innerHeight actual value: 640 desired value: 1524 passed: false
  expression: screen.height desired expression: innerHeight actual value: 640 desired value: 1394 passed: false
  expression: screen.height desired expression: innerHeight actual value: 640 desired value: 1677 passed: false
  expression: screen.height desired expression: innerHeight actual value: 640 desired value: 1394 passed: false
  expression: screen.height desired expression: innerHeight actual value: 640 desired value: 1524 passed: false
  expression: screen.height desired expression: innerHeight actual value: 640 desired value: 1416 passed: false
  expression: screen.height desired expression: innerHeight actual value: 1524 desired value: 1524 passed: true
  expression: screen.height desired expression: innerHeight actual value: 640 desired value: 1285 passed: false
  expression: screen.height desired expression: innerHeight actual value: 640 desired value: 1416 passed: false
screen.widthWidth of the user's screen, in pixels.
  expression: screen.width desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 980 desired value: 980 passed: true
  expression: screen.width desired expression: innerWidth actual value: 360 desired value: 980 passed: false
  expression: screen.width desired expression: innerWidth actual value: 360 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
  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: 24 desired value: 0 passed: false
  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
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
__hsscHubSpot tracking parameter
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
__hstcHubSpot tracking parameter
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
__sDrip.com email address tracking parameter
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
_hsencHubSpot tracking parameter
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
_openstatYandex tracking parameter
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
dclidDoubleClick Click ID (Google)
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
fbclidFacebook Click Identifier
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
gclidGoogle Click Identifier
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
hsCtaTrackingHubSpot tracking parameter
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
igshidInstagram tracking parameter
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
mc_eidMailchimp Email ID (email recipient's address)
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
mkt_tokAdobe Marketo tracking parameter
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
ml_subscriberMailerLite email tracking
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
ml_subscriber_hashMailerLite email tracking
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
msclkidMicrosoft Click ID
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
oly_anon_idOmeda marketing 'anonymous' customer id
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
oly_enc_idOmeda marketing 'known' customer id
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
rb_clickidUnknown high-entropy tracking parameter
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
s_cidAdobe Site Catalyst tracking parameter
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
vero_convVero tracking parameter
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
vero_idVero tracking parameter
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
wickedidWicked Reports e-commerce tracking
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
yclidYandex Click ID
  passed: true
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 passed: false
  value: 8799071570497363 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: 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: false
  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: 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: 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
  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: 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: false
  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: 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: 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: 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
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: 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: false
  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: 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: false
  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: 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: false
  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: 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: false
  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: 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: false
  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: 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: false
  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: 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: 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: 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
  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: 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: 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
  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: 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: false
  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: 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: 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
  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: 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: false
  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: 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: 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
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: 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: 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: false
  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