Desktop Browsers
(click anywhere for more info)


brave
1.34

chrome
97.0

edge
97.0

firefox
96.0

librewolf
96.0

opera
83.0

safari
15.2

tor
11.0

ungoogled
97.0

vivaldi
5.0
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, h3, h3, h3, h3 result, different first party: h2, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: true, false, false, false, false test failed: false, false, false, false, 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, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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, h3, h3, h3, h3 result, different first party: h2, h2, h2, h2, h2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, h3, h3, h3, h3 result, different first party: h2, h2, h2, h2, h2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
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, h2, h2, h2, h2 result, different first party: h2, h2, h2, h2, h2 unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, 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, h2, h2, h2, h2 result, different first party: h2, h2, h2, h2, h2 unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, 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, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a result, different first party: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 result, different first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 result, different first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 result, different first party: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 00c6cd07-5501-4d34-b966-8cd474dd8a1d, 0e2fdec3-606d-419e-b5d4-0a605b949cea, 0933424d-9c97-4406-a6db-76f8cbecbf69, 7d5a30a3-a1d4-463b-b740-9f24caf42873, bd837ee4-543d-45c7-b480-4f3f6c7bbb45 result, different first party: 00c6cd07-5501-4d34-b966-8cd474dd8a1d, 0e2fdec3-606d-419e-b5d4-0a605b949cea, 0933424d-9c97-4406-a6db-76f8cbecbf69, 7d5a30a3-a1d4-463b-b740-9f24caf42873, bd837ee4-543d-45c7-b480-4f3f6c7bbb45 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f result, different first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 8b1a4ec9-a528-493d-bb18-8f552e2898ff, 813acf68-8f68-4e75-8e00-f7dfbb118c8b, fa64accd-c7d2-45a9-afae-a4d2f7ae6399, 5a538bfb-e2cb-4588-812d-63a78dad9c2f, 114c7dc4-7b09-4144-ac8b-4e216893f6e0 result, different first party: 8b1a4ec9-a528-493d-bb18-8f552e2898ff, 813acf68-8f68-4e75-8e00-f7dfbb118c8b, fa64accd-c7d2-45a9-afae-a4d2f7ae6399, 5a538bfb-e2cb-4588-812d-63a78dad9c2f, 114c7dc4-7b09-4144-ac8b-4e216893f6e0 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 1331c999-097c-4024-8e80-b9a37d8753c5, 755ecf09-141f-4949-b27c-3b37719be86c, a97241eb-1a23-440b-9f92-f0e746d27665, 25fd8a5b-a84f-49ad-95fe-7dd4bd56fdde, 03d7bdaf-5449-4727-bf44-7c5a85f4179d result, different first party: Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 result, different first party: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 result, different first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a result, different first party: Error: no BroadcastChannel message, Error: no BroadcastChannel message, Error: no BroadcastChannel message, Error: no BroadcastChannel message, Error: no BroadcastChannel message unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 result, different first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 result, different first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 result, different first party: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 00c6cd07-5501-4d34-b966-8cd474dd8a1d, 0e2fdec3-606d-419e-b5d4-0a605b949cea, 0933424d-9c97-4406-a6db-76f8cbecbf69, 7d5a30a3-a1d4-463b-b740-9f24caf42873, bd837ee4-543d-45c7-b480-4f3f6c7bbb45 result, different first party: Error: no BroadcastChannel message, Error: no BroadcastChannel message, Error: no BroadcastChannel message, Error: no BroadcastChannel message, Error: no BroadcastChannel message unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f result, different first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: (secret) => { try { let bc = new BroadcastChannel("secrets"); bc.onmessage = (event) => { if (event.data === "request") { bc.postMessage(secret); } }; } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let bc = new BroadcastChannel("secrets"); bc.onmessage = (event) => { if (event.data !== "request") { resolve(event.data); } }; bc.postMessage("request"); setTimeout(() => reject({message: "no BroadcastChannel message"}), 3000); }) result, same first party: Error: Can't find variable: BroadcastChannel, Error: Can't find variable: BroadcastChannel, Error: Can't find variable: BroadcastChannel, Error: Can't find variable: BroadcastChannel, Error: Can't find variable: BroadcastChannel result, different first party: Error: Can't find variable: BroadcastChannel, Error: Can't find variable: BroadcastChannel, Error: Can't find variable: BroadcastChannel, Error: Can't find variable: BroadcastChannel, Error: Can't find variable: BroadcastChannel unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, 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: 1331c999-097c-4024-8e80-b9a37d8753c5, 755ecf09-141f-4949-b27c-3b37719be86c, a97241eb-1a23-440b-9f92-f0e746d27665, 25fd8a5b-a84f-49ad-95fe-7dd4bd56fdde, 03d7bdaf-5449-4727-bf44-7c5a85f4179d result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 result, different first party: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 result, different first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 58069814-89fe-4628-9bba-ae01813fb084, 58069814-89fe-4628-9bba-ae01813fb084, 58069814-89fe-4628-9bba-ae01813fb084, 58069814-89fe-4628-9bba-ae01813fb084, 58069814-89fe-4628-9bba-ae01813fb084 result, different first party: Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: c4e33abc-5116-480b-bfa7-3e3915dd7adb, c4e33abc-5116-480b-bfa7-3e3915dd7adb, c4e33abc-5116-480b-bfa7-3e3915dd7adb, c4e33abc-5116-480b-bfa7-3e3915dd7adb, c4e33abc-5116-480b-bfa7-3e3915dd7adb result, different first party: c4e33abc-5116-480b-bfa7-3e3915dd7adb, c4e33abc-5116-480b-bfa7-3e3915dd7adb, c4e33abc-5116-480b-bfa7-3e3915dd7adb, c4e33abc-5116-480b-bfa7-3e3915dd7adb, c4e33abc-5116-480b-bfa7-3e3915dd7adb unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 6046401262584151, 6046401262584151, 6046401262584151, 6046401262584151, 6046401262584151 result, different first party: 6046401262584151, 6046401262584151, 6046401262584151, 6046401262584151, 6046401262584151 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 result, different first party: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 00c6cd07-5501-4d34-b966-8cd474dd8a1d, 0e2fdec3-606d-419e-b5d4-0a605b949cea, 0933424d-9c97-4406-a6db-76f8cbecbf69, 7d5a30a3-a1d4-463b-b740-9f24caf42873, bd837ee4-543d-45c7-b480-4f3f6c7bbb45 result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 8847123413332609, 8847123413332609, 8847123413332609, 8847123413332609, 8847123413332609 result, different first party: 8847123413332609, 8847123413332609, 8847123413332609, 8847123413332609, 8847123413332609 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: caaebbbc-f7e3-44ee-8691-9203c909b530, caaebbbc-f7e3-44ee-8691-9203c909b530, caaebbbc-f7e3-44ee-8691-9203c909b530, caaebbbc-f7e3-44ee-8691-9203c909b530, caaebbbc-f7e3-44ee-8691-9203c909b530 result, different first party: Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url') unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 result, different first party: Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 6254449813902438, 6254449813902438, 6254449813902438, 6254449813902438, 6254449813902438 result, different first party: 6254449813902438, 6254449813902438, 6254449813902438, 6254449813902438, 6254449813902438 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 result, different first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 result, different first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 result, different first party: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 00c6cd07-5501-4d34-b966-8cd474dd8a1d, 0e2fdec3-606d-419e-b5d4-0a605b949cea, 0933424d-9c97-4406-a6db-76f8cbecbf69, 7d5a30a3-a1d4-463b-b740-9f24caf42873, bd837ee4-543d-45c7-b480-4f3f6c7bbb45 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f result, different first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 8b1a4ec9-a528-493d-bb18-8f552e2898ff, 813acf68-8f68-4e75-8e00-f7dfbb118c8b, fa64accd-c7d2-45a9-afae-a4d2f7ae6399, 5a538bfb-e2cb-4588-812d-63a78dad9c2f, 114c7dc4-7b09-4144-ac8b-4e216893f6e0 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 1331c999-097c-4024-8e80-b9a37d8753c5, 755ecf09-141f-4949-b27c-3b37719be86c, a97241eb-1a23-440b-9f92-f0e746d27665, 25fd8a5b-a84f-49ad-95fe-7dd4bd56fdde, 03d7bdaf-5449-4727-bf44-7c5a85f4179d result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 result, different first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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_563825711197661, fake_3335434274223845, fake_8992051421567362, fake_16332145651555363, fake_8578372473016378 result, different first party: fake_8550863848792989, fake_8957044365086804, fake_24734154257485375, fake_677117437648783, fake_7849105774314848 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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_7186488266941378, fake_5275789428306354, fake_20173142068733396, fake_5231918231559956, fake_514668309382116 result, different first party: fake_303789332026847, fake_4531288259770385, fake_8911724445307658, fake_23613704796109447, fake_7573344120500145 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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_3787557353690716, fake_30129491513486806, fake_8813963484084484, fake_06970978497313163, fake_6813058065303335 result, different first party: fake_6368310467472931, fake_6723854502538253, fake_02437218189921664, fake_40921397378547963, fake_8185528015164933 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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_5677857874333487, fake_3587862370485848, fake_38262130153566876, fake_16284623140201648, fake_20948301229048383 result, different first party: fake_045248651504963044, fake_8776309623330087, fake_34262932908662336, fake_2590976274317447, fake_42673307822181816 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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_00496453139029196, fake_006220814369219507, fake_3353470102803251, fake_22876670997069892, fake_7177491179622335 result, different first party: fake_053136579052990074, fake_21656522133096257, fake_2860470872616825, fake_9456696478009352, fake_6362272655614412 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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_9161981084788531, fake_42086002439506376, fake_20381199710635167, fake_3097438800500236, fake_7167662980261369 result, different first party: fake_3787017718406831, fake_569470451197335, fake_506838066750239, fake_5782201561457372, fake_3557646651831454 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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_5126487260627302, fake_9147941195739284, fake_016648987192140696, fake_7529177453368325, fake_22755148679769022 result, different first party: fake_9973655751769612, fake_07747043187796354, fake_8251946243497879, fake_1580574497205931, fake_2786927643860073 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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_7878835719402604, fake_08664450843106186, fake_9051365244504364, fake_8418705857840472, fake_7882784791609172 result, different first party: fake_06337597501552694, fake_4926028860477518, fake_3947668031234297, fake_34339449207648665, fake_21187061462286616 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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_2264817128319252, fake_3374505946902431, fake_3350392859806195, fake_6760606399208504, fake_08771213927734123 result, different first party: fake_2264817128319252, fake_3374505946902431, fake_3350392859806195, fake_6760606399208504, fake_08771213927734123 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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_3255762821470094, fake_9441451067570592, fake_5919517625259212, fake_9789562649729076, fake_5251592427816492 result, different first party: fake_5768036411013657, fake_8542487017821216, fake_7975928986325116, fake_4270384023298186, fake_018543252737658333 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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: 2, 2, 2, 2, 2 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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: 2, 2, 2, 2, 2 result, different first party: 3, 3, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
font 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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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: 2, 2, 2, 2, 2 result, different first party: 3, 3, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 result, different first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 result, different first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 00c6cd07-5501-4d34-b966-8cd474dd8a1d, 0e2fdec3-606d-419e-b5d4-0a605b949cea, 0933424d-9c97-4406-a6db-76f8cbecbf69, 7d5a30a3-a1d4-463b-b740-9f24caf42873, bd837ee4-543d-45c7-b480-4f3f6c7bbb45 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f result, different first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 8b1a4ec9-a528-493d-bb18-8f552e2898ff, 813acf68-8f68-4e75-8e00-f7dfbb118c8b, fa64accd-c7d2-45a9-afae-a4d2f7ae6399, 5a538bfb-e2cb-4588-812d-63a78dad9c2f, 114c7dc4-7b09-4144-ac8b-4e216893f6e0 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: 1331c999-097c-4024-8e80-b9a37d8753c5, 755ecf09-141f-4949-b27c-3b37719be86c, a97241eb-1a23-440b-9f92-f0e746d27665, 25fd8a5b-a84f-49ad-95fe-7dd4bd56fdde, 03d7bdaf-5449-4727-bf44-7c5a85f4179d result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 result, different first party: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 result, different first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 result, different first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 result, different first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 00c6cd07-5501-4d34-b966-8cd474dd8a1d, 0e2fdec3-606d-419e-b5d4-0a605b949cea, 0933424d-9c97-4406-a6db-76f8cbecbf69, 7d5a30a3-a1d4-463b-b740-9f24caf42873, bd837ee4-543d-45c7-b480-4f3f6c7bbb45 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f result, different first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 8b1a4ec9-a528-493d-bb18-8f552e2898ff, 813acf68-8f68-4e75-8e00-f7dfbb118c8b, fa64accd-c7d2-45a9-afae-a4d2f7ae6399, 5a538bfb-e2cb-4588-812d-63a78dad9c2f, 114c7dc4-7b09-4144-ac8b-4e216893f6e0 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 1331c999-097c-4024-8e80-b9a37d8753c5, 755ecf09-141f-4949-b27c-3b37719be86c, a97241eb-1a23-440b-9f92-f0e746d27665, 25fd8a5b-a84f-49ad-95fe-7dd4bd56fdde, 03d7bdaf-5449-4727-bf44-7c5a85f4179d result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 result, different first party: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 result, different first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: a88d4c09b720eb1daf1cb388987dbc90, 7a7e85edec0a6f685f4a6920ab022836, 3946234c40baf6142c4ee07466c351f2, d7e2e5ced1e3d2a12adcba9411b66d20, cf21d11f0e0896854ace7db431eb76a8 result, different first party: 535c771fd68922fbae1a11f412ed14cc, f2e170b839c936856d55f76160366683, 82bca7c2dfc5377078e0bebb1321ac1f, c2dfd87b1ffdc2fe950fbd0d9299b3ef, 2ecd9acc7168a0bb84fd829e76689899 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: bc485e7ada5b628e8670219894fd7f35, 53fb0fe3599e3ae4458c422a51abb0b3, da3c7e91bb647280fc5140c595d7626a, a5f8a7334ce21a7d261bfb2e2bc747f5, 5efc903e3bece95a6eef36b99c9f535e result, different first party: bc485e7ada5b628e8670219894fd7f35, 53fb0fe3599e3ae4458c422a51abb0b3, da3c7e91bb647280fc5140c595d7626a, a5f8a7334ce21a7d261bfb2e2bc747f5, 5efc903e3bece95a6eef36b99c9f535e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 373771e082b1ae24270b7ec46d1a564a, 316ad01e9cc8f22038c9c693b5f9af1c, e88dc492f4c610e0982febd1d89c10c7, 25bc9133628e8da77ba6050c06ee767b, 0f995823ea15f6de4f407f945603f216 result, different first party: 373771e082b1ae24270b7ec46d1a564a, 316ad01e9cc8f22038c9c693b5f9af1c, e88dc492f4c610e0982febd1d89c10c7, 25bc9133628e8da77ba6050c06ee767b, 0f995823ea15f6de4f407f945603f216 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 0078b0b2b05ffcad64e23001667dbcb5, 05e540b3dc95f98ae78e0d3f5260d5c0, da3099954ec5d5d04f75c28d1a6b55f5, c142bd2eddbd6a7deb4f267df5bc151c, 9fa3ce5de348bdccc22fe0a5437db470 result, different first party: 78e78921ac2773acde8b228d43baf246, a8ca52adac40dbb771d3400372e03665, c027332035e1e5a9634ba2cea6218e5b, 8ebc69f2d1e3b4a9503cac3199cf2ebd, a08834909032d0974f4fcd0588d6995e unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: f16e4ba4db1d404e8c609d1cf04b9868, 8ba46a6183b189d07e96c4522579ba71, e26b133d4b6527fe9e283647f945818d, e527b9d7de5a2b2046e4590d3b8ca19b, f1f6bb8c500bcbfa064121c2bbe18db3 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: 68f564df395eee7f6db607da4b2f18b0, 981c62831042113c6f6bc398cddaebc4, 04ade54e79436b687c6537c7d99320ed, e6750cceab9b5ee1c2f7953bf7e19952, d39682bdf8c8b97e40c5fd44d76f31ca result, different first party: 68f564df395eee7f6db607da4b2f18b0, 981c62831042113c6f6bc398cddaebc4, 04ade54e79436b687c6537c7d99320ed, e6750cceab9b5ee1c2f7953bf7e19952, d39682bdf8c8b97e40c5fd44d76f31ca unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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, true, true, true, true passed: undefined test failed: false, false, false, false, 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, true, true, true, true passed: undefined test failed: false, false, false, false, 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: b255b8bb9664ae1b46fb79e129bab8a8, 6a99e33645124a727962a396907448b5, 68d7580406fef756c5cae536735c1f83, f60dcb5937cd987ce829374144ed5f50, 14564f64e0661936922cce38524ecd72 result, different first party: b255b8bb9664ae1b46fb79e129bab8a8, 6a99e33645124a727962a396907448b5, 68d7580406fef756c5cae536735c1f83, f60dcb5937cd987ce829374144ed5f50, 14564f64e0661936922cce38524ecd72 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 52dc19726a883b9346fac01dbc0b7372, a4b469c8932f20ccab4c8593daa86e10, 9fbd9b11b4b12dea5f92e0b561b5bbe6, bd788d4fbb78759a6e0b0d66304d3dd2, 74c115696b1f16659e5aa2c6a38a5fbf result, different first party: 52dc19726a883b9346fac01dbc0b7372, a4b469c8932f20ccab4c8593daa86e10, 9fbd9b11b4b12dea5f92e0b561b5bbe6, bd788d4fbb78759a6e0b0d66304d3dd2, 74c115696b1f16659e5aa2c6a38a5fbf unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Used http, Used http, Used http, Used http, Used http unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: null read: null result, same first party: , , , , result, different first party: HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected unsupported: , , , , passed: true, true, true, true, true test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Used http, Used http, Used http, Used http, Used http unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Used http, Used http, Used http, Used http, Used http unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
iframe 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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
image 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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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: 2, 2, 2, 2, 2 result, different first party: 3, 3, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
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: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a result, different first party: Error: The user denied permission to access the database., Error: The user denied permission to access the database., Error: The user denied permission to access the database., Error: The user denied permission to access the database., Error: The user denied permission to access the database. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 result, different first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 result, different first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 result, different first party: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 00c6cd07-5501-4d34-b966-8cd474dd8a1d, 0e2fdec3-606d-419e-b5d4-0a605b949cea, 0933424d-9c97-4406-a6db-76f8cbecbf69, 7d5a30a3-a1d4-463b-b740-9f24caf42873, bd837ee4-543d-45c7-b480-4f3f6c7bbb45 result, different first party: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f result, different first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 8b1a4ec9-a528-493d-bb18-8f552e2898ff, 813acf68-8f68-4e75-8e00-f7dfbb118c8b, fa64accd-c7d2-45a9-afae-a4d2f7ae6399, 5a538bfb-e2cb-4588-812d-63a78dad9c2f, 114c7dc4-7b09-4144-ac8b-4e216893f6e0 result, different first party: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations. result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 result, different first party: Error: The user denied permission to access the database., Error: The user denied permission to access the database., Error: The user denied permission to access the database., Error: The user denied permission to access the database., Error: The user denied permission to access the database. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 result, different first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 result, different first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 result, different first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 result, different first party: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 00c6cd07-5501-4d34-b966-8cd474dd8a1d, 0e2fdec3-606d-419e-b5d4-0a605b949cea, 0933424d-9c97-4406-a6db-76f8cbecbf69, 7d5a30a3-a1d4-463b-b740-9f24caf42873, bd837ee4-543d-45c7-b480-4f3f6c7bbb45 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f result, different first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 8b1a4ec9-a528-493d-bb18-8f552e2898ff, 813acf68-8f68-4e75-8e00-f7dfbb118c8b, fa64accd-c7d2-45a9-afae-a4d2f7ae6399, 5a538bfb-e2cb-4588-812d-63a78dad9c2f, 114c7dc4-7b09-4144-ac8b-4e216893f6e0 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 1331c999-097c-4024-8e80-b9a37d8753c5, 755ecf09-141f-4949-b27c-3b37719be86c, a97241eb-1a23-440b-9f92-f0e746d27665, 25fd8a5b-a84f-49ad-95fe-7dd4bd56fdde, 03d7bdaf-5449-4727-bf44-7c5a85f4179d result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 result, different first party: Error: Failed to read the 'localStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'localStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'localStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'localStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'localStorage' property from 'Window': Access is denied for this document. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 result, different first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a result, different first party: Error: Failed to execute 'query' on 'LockManager': Access to the Locks API is denied in this context., Error: Failed to execute 'query' on 'LockManager': Access to the Locks API is denied in this context., Error: Failed to execute 'query' on 'LockManager': Access to the Locks API is denied in this context., Error: Failed to execute 'query' on 'LockManager': Access to the Locks API is denied in this context., Error: Failed to execute 'query' on 'LockManager': Access to the Locks API is denied in this context. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 result, different first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 result, different first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 result, different first party: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 00c6cd07-5501-4d34-b966-8cd474dd8a1d, 0e2fdec3-606d-419e-b5d4-0a605b949cea, 0933424d-9c97-4406-a6db-76f8cbecbf69, 7d5a30a3-a1d4-463b-b740-9f24caf42873, bd837ee4-543d-45c7-b480-4f3f6c7bbb45 result, different first party: Error: LockManager.query: query() is not allowed in this context, Error: LockManager.query: query() is not allowed in this context, Error: LockManager.query: query() is not allowed in this context, Error: LockManager.query: query() is not allowed in this context, Error: LockManager.query: query() is not allowed in this context unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f result, different first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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, true, true, true, true passed: undefined test failed: false, false, false, false, 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, true, true, true, true passed: undefined test failed: false, false, false, false, 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: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 result, different first party: Error: Failed to execute 'query' on 'LockManager': Access to the Locks API is denied in this context., Error: Failed to execute 'query' on 'LockManager': Access to the Locks API is denied in this context., Error: Failed to execute 'query' on 'LockManager': Access to the Locks API is denied in this context., Error: Failed to execute 'query' on 'LockManager': Access to the Locks API is denied in this context., Error: Failed to execute 'query' on 'LockManager': Access to the Locks API is denied in this context. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 result, different first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received result, different first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received result, different first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: , , , , result, different first party: Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker. unsupported: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: , , , , result, different first party: , , , , unsupported: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: , , , , result, different first party: , , , , unsupported: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 result, different first party: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. result, different first party: , , , , unsupported: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: , , , , result, different first party: , , , , unsupported: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 8b1a4ec9-a528-493d-bb18-8f552e2898ff, 813acf68-8f68-4e75-8e00-f7dfbb118c8b, fa64accd-c7d2-45a9-afae-a4d2f7ae6399, 5a538bfb-e2cb-4588-812d-63a78dad9c2f, 114c7dc4-7b09-4144-ac8b-4e216893f6e0 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined result, different first party: Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  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: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 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., 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., 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., 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., 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, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: , , , , result, different first party: , , , , unsupported: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
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: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a result, different first party: Error: undefined, Error: undefined, Error: undefined, Error: undefined, Error: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 result, different first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 result, different first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 result, different first party: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 00c6cd07-5501-4d34-b966-8cd474dd8a1d, 0e2fdec3-606d-419e-b5d4-0a605b949cea, 0933424d-9c97-4406-a6db-76f8cbecbf69, 7d5a30a3-a1d4-463b-b740-9f24caf42873, bd837ee4-543d-45c7-b480-4f3f6c7bbb45 result, different first party: , Error: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f result, different first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker result, different first party: Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, 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: 1331c999-097c-4024-8e80-b9a37d8753c5, 755ecf09-141f-4949-b27c-3b37719be86c, a97241eb-1a23-440b-9f92-f0e746d27665, 25fd8a5b-a84f-49ad-95fe-7dd4bd56fdde, 03d7bdaf-5449-4727-bf44-7c5a85f4179d result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 result, different first party: Error: undefined, Error: undefined, Error: undefined, Error: undefined, Error: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 result, different first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: cdf4b25eac24346816df3a3d2ae537dc8702503ccb38cd329ab8eb5f04f86154, 209d0f32400f3542f721a8dd40cab5e5b7e702c805b81666216c7e7041a5beb5, 184e3704d27e516bbb4a0c5e2963da1a42a7e011cec94d42a0a9f30ea7aacd92, d83ea153921598bba8f3725bb0b970afe7066fab258f7575ebd0ef418d9ea4ae, 9932e5722cdc891809f1d568e1f0a04870c2a9d5d09c98d8bec45161fa13edd8 result, different first party: 04301f0f0b32d69868107c8c29f353d4a4b5a4639b8baa789a12b66f96e0006c, 0430c346c2ba3543a97dc4c98393a394aaa1851d99e11196a1eb10e771b89ccd, 04308d89dd5db791fb5db9e8e627fc75c9ccd4b7d5e872ed8fa6770b9d404fa5, 0430fae128af1073d55b5f2083aaab15637a7884c8b169d5ed8d770198480553, 043000475c59e7a827cb8155671f8868714e4dc5547f7830bfeadc245f0e1020 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: 189de2f99012692802256ce683f19e0dadad6e93458888639ed7fcd78c1a9ad6, b4840f7a707b9cad6794deccbb1209b6649ff31e29702309df14836bedfd4afd, 0c178e651cd1262859a3813672955204f1146fc1827b94b92bfab9b0e4812d37, cc1614d356a373b4b4620437e75edebc274dc1776cd188f2c7e33a17a4db5384, fe60427bb03a4f5f8c7b22defe4ee5afb9006d0eb2f45ff976c9ee2ecec0bd32 result, different first party: b4b89a8b56f86d4498be7c3fd00ee3bfc574bd94808973603c657c7bb11e5793, bfe329e41bc6de61bf5d9e3c4157dc4cc3200a3bcd6b9cb6c8238dbaf031ef62, 012a8c66576839e22e2323a5fbee27f240f175c5610c7ad3cc88a11ab89950ca, 2f77d6672873eb8c76bdc383fbfdb89be64e7a0a1c92d2c59c5419479be33213, c07218aa5f3895611687b3fe24067a9eeba7ef76b6257ac310efc4f9efbc4965 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: 54635c18c28970c1d37b2797ed0dbb4f4eacbb32f61ea88ad41991cc2d508cf0, bcb7547c2832ac9c70ac41b79a673393c08e5f8e2cd35709d221357f2245e0d8, 70f50bc291666564418662e3328993f047ec1306c274cb6b4a1fe06f5b2eb284, 1e55bdba90013a8e476f1fcf5456493f8581720d61cc2eb788e5fd25dd7afd4c, 26ba2ac6035f113044916de8eda31b7f37a747ac51a71546be7fde6024af75cb result, different first party: 62f937b8dc786afcb61d375bb66ff87031559e30407120fcb34b201714620d66, 544aa24796c667956fc9729d3986cb3deeaba890a8aff0f0d34821ad47e23fc4, 15c479407bf8d07f42e8f4a76fd4531ab11947848f0bddbcee05e6f3edae4c4a, b2c4f61ba7ecc2138c6899038a579d3ca313fd006c08de063edc7152d4214f19, ee415f6ebd5415f80b38be298a38754a4b5f8c21a57b35979c9d9b152f78ec8a unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: e67ef9e1170607e622450105f67c971da1b7addd2bcd8318287fca4714a6bebe, 93c96fcd6a7950697624b65ee26d015170e93337ba3d1534b739452f2e2ed8be, 9c5600ad2d71d850aba49179d949b7e0654dcb9d465666ca9f1e37075438b149, a0602671b9e37d34ed2365f15011739c376db6b737d34348dac86a919d85fc24, d4927c42c5791e14dd67060f2da2de227877d130381c89c6687efeab700936e8 result, different first party: 0430e35954a85206eb0ac4a56d8a9b52eefd2589bd90cd492dcc66ca49af3d7e, 0430b53e2f4e0d31bc178540bedc4ae33f5f8263df370a26bf6a9cf36cdeba51, 0430ae160444774fc45d587d8e49532e4a521383dc729664732c428c486686a6, 0430a97e95c775d8986531083827e3c97a8d519c3b1639a792d07e024c82b394, 04308684e4d88c0fb224810b2a09059d90a7f3c365fee6383ac48875a3323712 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: 61e4a5dc65dfd8ee6552dc07f216c144550b39d3b1d1a97957910b38b808a81d, 5890a0511460f470ccd4f5e53a25f953d4a7d4a088e9fae6cf697cb0294fdd25, 2bda07e15d3f16f3b7415a8f215901db1be0887554074a0c3478aff75e69963d, c36bda0aa2f22e2cbc8b2c3e1e5c01d2c045854aec5de341af03b30766016957, b6514c343e81a2a35d72da4928c4925222616a6c6efccd35116e46546a8671d4 result, different first party: 0430d9c9f0c762d3e338a3154635063092aa03c3d109d2e3713978773177a381, 0430793aa9b6523c8db80c64f9b9055ca20551b96d446e11537fbb61abb4f315, 0430adabb53198873d7a5e170ad2b3ea6d8f36d30b202e9a3fb3a49176b523c0, 0430f80a5f87a8fd585f125c8190fc4d48be03c854011b0ab840fb48634c44b5, 0430b6a28040d3e66dca968f264013a8d80406a4fdc7e41b944cd4ca91825102 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: bbe7732838881d318d64849880ed89f4bcc452dc445d281ea4d50692e53e4007, 53ca6ebea5b0d44f57dc5badf8776f950c57ab5723532db20e90c75e1c53e3cf, 0a4c6bc064c9fcd5471d74fff66297bcd0c4a97b0390e495140097699c55467a, e8353a7607e917f5e431e36b068a85182d172b5e48c5b54632ae7aa1f0a3482e, 656e7733aa3f4b266167c897d28945c2a7d75491c5c5562e73244da41eb725f5 result, different first party: ae2e8b5a8afc920671ee97ceff36fb03acdaa05bfb0a49a3747bbfdbdf48e40b, 30f31c15b5b7002c4c5739510b49b16f76c3fa93c07bf463ab93cb55de024677, b55790ebb31442d07df57279cc6dce4c4af0134d725748d0a69241dd734f607c, c0d04662b49cd648c311ffca0de23d02587ffa502eb1c977e5d26e6a6534e2c9, d3c58ceec763420afd862679003c9d0dfe271f82cfd081e3457e1e693ad9c9db unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: 1959cd676d715023b278f8d6998786fcc1d9806d7814fa5ab6062c936a77e820, a9929f10bc2886a28b10df85d06e1c867be821caec8dd1a7005416f5f774a83d, bd20c16f7775baddaff1034e5b36d355f0cb01b769691dcab66334468e127a0d, 2e92ec14bdb532b879450a53f6d39ccd1db55a0a745fd0c15567e857f1c8a2c6, 522b4e2606d130bf0acc0eef0e7359304cecd6b5049fe1a2dd314d999787c1f5 result, different first party: d7a599fc9f054385c5ca416beb77f5781f3fcf627448f803f869cddb2df8e901, e4273b6a52354f2cb5f510990da098097de3a11ee083c0c3f5714f40b32a1871, 61fae0f7e718ce2dfc557d69205131c9b6e3ad4f47f1ad5e381e0a6a9a6263d5, e391d21c5aa30bb77f50d489f5c7947c178f6e49c76150d4adfcd4a896c80bec, b80aa81adf10a8b3720278dbf72ad9c81b87f167ef6a552bb99bfd0acbb9fb33 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: 25837a7d5397abebeb648df8622f357c87db02b4636cfa4bfb405bb3211cab38, a4656c7ad215b210473aa8e8e255e45c567682ec7ef3fde8fdf87dc712e8f8b1, 4a49ba7e2e20b6181974fb04cf08fe3351a4e0d11309fc89e62d0d283d1aaf02, 0249925f57339908cdaf84b810edf21928707012d87dc47d29721884e9b30986, b7b038a88747c779c80324b423cb8d0342657c0296a2ae19d4cfb170cd992be0 result, different first party: ef41ea3914f78822428ca2c5c5006f04ff061d636c3a3b34c80fbe7ac65e7f65, f65115535b18470c9ee300dbdf9fe3c2d48456f9e8d14df26777f775c5d0dcce, a6b44c99ee920716eb2d788b30b1ee2a3a37ff9feb3680f0fb4759de30bf8001, 4f9aa4b954874c12cece256e54d63351faa2bfa3f0058745468d63f85c7f5bd5, bc48ca3e6bde7324567a83eb732b2ced9a545c8e5caba890452918c33f573eda unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: 28af600b90ed0ad2e712e0bd361cc4ff111dcf4c1d3c68d127e1ed68305df3cb, 65343c005f603a3dc5a992b43d34be64fbc8f8cef9410aac304b81017340c450, 29e71d505cef8981463e30bbbdd2dd15f3ed33c30a7007f1c57fa32f2233e0a0, d0dca094c4f2072a8bc9067c6545845bcc1a9230646a7d2c5a808ad06972e3f1, 8618b74cd98570eeb6eeeb36a40131831bf5678c0109f474bdd32c91933cb582 result, different first party: b3fc3ed64dd8b6fbfebedc7e37b980f538afb08386c47f80adbdad9b1beb155f, 8ed95b8297637843c802eccc7d150177cf8ebe5bf652be141aff421564c38a37, ba2c5fdf84e115dfaf90730fd2ad95b7f8004f41366c4073747c2e37908bae38, 82061634b2c5d6f535aa10713c22d1766221f633e54ee673e9614151e457ba90, 85dfaca8d2b06adf367f7c88679fc2deb7553bb863aae36fdb025c74703e0e02 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: 29bfa93d589fe233577c71dee93675b8a0bb964c229034d1318d6d7fac3978ab, b412751dfb86be2be41767de0ac15bc48a0ce5687d73ead9b2fc288a13c6869a, 284726d1a9a1f243b1dffa1daa3ef09492dcbae49eb985cfe3ceebfb36976e4d, 2796b69e7a445dda28af8ac6b397f16677a1f1ddd149cd23921d07c56ee2f156, 2a69551bb46086c5dc0dd73c896c7b9dbc2e0bd02fb9dc5abeedc32fc2058b73 result, different first party: fb13a366ceaa78d4d5ff0e513ee8e546285f0c99db084c286fcb30b4d1f06adb, bca310b78bdf1e8932d38e8fa0a12d6912e03d7e9a90554c82d4c208f2e36022, 9a7834243d1020808e1e344756e91ddc293fdd0ba75a05fd7b3a481c794293e2, 382d3df7a28c4bd903bc47b88895c5c86da8062452f77a3bf0074ca9946efa0f, 1e6d88e9d7dd485c20ef9fb48a54beb1e51622f76090a5b00af374b5952856b9 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a result, different first party: Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 result, different first party: Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 result, different first party: Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
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, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function result, different first party: Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, 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, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function result, different first party: Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, 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: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f result, different first party: Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated result, different first party: Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, 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, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function result, different first party: Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, 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: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 result, different first party: Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 result, different first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 2, 2, 2, 2, 2 result, different first party: 3, 3, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
Navigation 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/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 result, different first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 result, different first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 result, different first party: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 00c6cd07-5501-4d34-b966-8cd474dd8a1d, 0e2fdec3-606d-419e-b5d4-0a605b949cea, 0933424d-9c97-4406-a6db-76f8cbecbf69, 7d5a30a3-a1d4-463b-b740-9f24caf42873, bd837ee4-543d-45c7-b480-4f3f6c7bbb45 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f result, different first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 8b1a4ec9-a528-493d-bb18-8f552e2898ff, 813acf68-8f68-4e75-8e00-f7dfbb118c8b, fa64accd-c7d2-45a9-afae-a4d2f7ae6399, 5a538bfb-e2cb-4588-812d-63a78dad9c2f, 114c7dc4-7b09-4144-ac8b-4e216893f6e0 result, different first party: 8b1a4ec9-a528-493d-bb18-8f552e2898ff, 813acf68-8f68-4e75-8e00-f7dfbb118c8b, fa64accd-c7d2-45a9-afae-a4d2f7ae6399, 5a538bfb-e2cb-4588-812d-63a78dad9c2f, 114c7dc4-7b09-4144-ac8b-4e216893f6e0 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 1331c999-097c-4024-8e80-b9a37d8753c5, 755ecf09-141f-4949-b27c-3b37719be86c, a97241eb-1a23-440b-9f92-f0e746d27665, 25fd8a5b-a84f-49ad-95fe-7dd4bd56fdde, 03d7bdaf-5449-4727-bf44-7c5a85f4179d result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 result, different first party: Error: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 result, different first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a result, different first party: 57c0a0b2-8699-49f0-9e0a-6047a248c3fb, b9aa5a2a-ec73-4094-9839-703aa273fc63, 38b86807-0685-4ffc-9743-1187c55b63e8, 5a7e8316-7c24-42f6-a2b6-deccffbb398f, 899020a7-fb3d-4925-96e3-70a8d96feb5a unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 result, different first party: 9b422fa6-551a-42f5-abe4-95f663bbfbf7, 4a2f7eb4-6e2c-4a19-a4f0-3f4371139c9e, e44de9a3-1e1b-4bbf-a6bc-0cd8c5ffc8d2, b99bea96-d1bd-4e47-9b88-657dae772a58, 3b9be32c-2f21-4cae-8680-9b95919605c6 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 result, different first party: 65044f82-576d-4b92-af42-d719b76e1c65, c71801db-1d4e-4a98-a8d7-c2fb25cf0339, 61ce23ab-ec67-476e-9f52-48e630307399, 2d4bfd6c-5e75-4f74-a517-edbc8f8f6fd5, 9df3297b-ca7c-4ae8-9bfc-33863d004470 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 87dcf277-8e58-4984-b6fa-05f0b206123f, 08cf831e-cbdc-4288-b953-63199d0378b8, 23a86822-f32f-4604-a928-8dc0cc18f693, 22fcec16-2be2-43e2-9ce8-b947968a93fc, c51f553d-70b0-433e-adfa-696f5dbd7d08 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: 00c6cd07-5501-4d34-b966-8cd474dd8a1d, 0e2fdec3-606d-419e-b5d4-0a605b949cea, 0933424d-9c97-4406-a6db-76f8cbecbf69, 7d5a30a3-a1d4-463b-b740-9f24caf42873, bd837ee4-543d-45c7-b480-4f3f6c7bbb45 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f result, different first party: e3a8df65-89ae-493c-9489-a19ae171fd59, fe52b041-d535-4ec3-9ba4-2aa2b59ddce4, 13414214-db68-4618-aed3-db1e3b45a715, 0522e234-c7b0-40f9-985d-3b82c3f71a73, 762d4d8b-8fb1-46f7-94cd-da464d6d1b7f unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 8b1a4ec9-a528-493d-bb18-8f552e2898ff, 813acf68-8f68-4e75-8e00-f7dfbb118c8b, fa64accd-c7d2-45a9-afae-a4d2f7ae6399, 5a538bfb-e2cb-4588-812d-63a78dad9c2f, 114c7dc4-7b09-4144-ac8b-4e216893f6e0 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, 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: 1331c999-097c-4024-8e80-b9a37d8753c5, 755ecf09-141f-4949-b27c-3b37719be86c, a97241eb-1a23-440b-9f92-f0e746d27665, 25fd8a5b-a84f-49ad-95fe-7dd4bd56fdde, 03d7bdaf-5449-4727-bf44-7c5a85f4179d result, different first party: 1331c999-097c-4024-8e80-b9a37d8753c5, 755ecf09-141f-4949-b27c-3b37719be86c, a97241eb-1a23-440b-9f92-f0e746d27665, 25fd8a5b-a84f-49ad-95fe-7dd4bd56fdde, 03d7bdaf-5449-4727-bf44-7c5a85f4179d unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 result, different first party: 38a6db08-5b31-41a0-b1fb-18954889d5f0, b6f53ed8-313c-48c0-b85a-ac566f590942, a1531dfb-1b31-483b-a2fc-4b135970e9e1, fbfba4c2-ea61-4a39-85d4-f45894c42bcc, 3c6f4621-5171-4e31-8484-82f6ca4c3307 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 result, different first party: f2d01bb0-c0fa-43dc-a871-d1fb1adf30f2, 28e527e7-552b-4124-ae25-b2121ff31cc0, 06f596a0-95f5-463d-b56e-2e433a48a34e, e3db15e3-ebe5-41ab-9128-52a156f664b7, b09f7d22-295a-4073-8a11-e18baebfb7f4 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, 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,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: true,true,true,true,true result: Insecure website never loaded,Insecure website never loaded,Insecure website never loaded,Insecure website never loaded,Insecure website never loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,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,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,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,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
Upgradable imageChecks to see if the browser attempts to upgrade an insecure address for an image to HTTPS whenever possible.
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: false,false,false,false,false result: loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: false,false,false,false,false result: loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely
  passed: false,false,false,false,false result: loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
Upgradable scriptChecks to see if the browser attempts to upgrade an insecure address for an script to HTTPS whenever possible.
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,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,true,true,true,true
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
GPC enabled third-partyThe Global Privacy Control is an HTTP header that can be sent by a browser to instruct a visited website not to sell the user's personal data to other parties. This test checks to see if the GPC header is sent to third-party elements on the web page.
  sec-gpc: 1 passed: true,true,true,true,true
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,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,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: true,true,true,true,true
  passed: false,false,false,false,false
  passed: false,false,false,false,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,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
  write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: false,false,false,false,false readSameFirstParty: 2a0b:f4c2:2::39,2a0b:f4c2:2::43,2a0b:f4c2:2::37,2a0b:f4c2:2::32,Error: Unsupported readDifferentFirstParty: 2604:6600:2005:16:172:107:94:154,185.193.52.180,2a0f:9100:110:a::92,2a0b:f4c2:2::37,2605:6400:30:f339:4b1c:e34b:741c:174f passed: true,true,true,true testFailed: false,false,false,false,true
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
Tor 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,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: true,true,true,true,true passed: true,true,true,true,true
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,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: 1440,1440,1440,1440,1440 desired value: 1112,1112,1112,1112,1112 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1336,1336,1336,1336,1336 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 900,900,900,900,900 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 983,983,942,983,983 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 928,928,928,928,928 desired value: 928,928,928,928,928 passed: true,true,true,true,true
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1341,1341,1341,1341,1341 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 860,860,860,860,860 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1260,1260,1260,1260,1260 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 988,988,988,988,988 passed: false,false,false,false,false
Media query screen widthWidth of the user's screen in pixels.
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1280,1280,1280,1280,1280 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1607,1607,1607,1607,1607 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1280,1280,1280,1280,1280 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 1600,1600,1600,1600,1600 desired value: 1600,1600,1600,1600,1600 passed: true,true,true,true,true
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1240,1240,1240,1240,1240 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1324,1324,1324,1324,1324 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1306,1306,1306,1306,1306 passed: false,false,false,false,false
outerHeightHeight of the browser window in pixels, including browser chrome.
  expression: outerHeight desired expression: innerHeight actual value: 1187,1187,1187,1187,1187 desired value: 1112,1112,1112,1112,1112 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1415,1415,1415,1415,1415 desired value: 1336,1336,1336,1336,1336 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 979,979,979,979,979 desired value: 900,900,900,900,900 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1068,1068,1068,1068,1068 desired value: 983,983,942,983,983 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 928,928,928,928,928 desired value: 928,928,928,928,928 passed: true,true,true,true,true
  expression: outerHeight desired expression: innerHeight actual value: 1415,1415,1415,1415,1415 desired value: 1341,1341,1341,1341,1341 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 940,940,940,940,940 desired value: 860,860,860,860,860 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: outerHeight desired expression: innerHeight actual value: 1371,1371,1371,1371,1371 desired value: 1260,1260,1260,1260,1260 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1081,1081,1081,1081,1081 desired value: 988,988,988,988,988 passed: false,false,false,false,false
screen.heightHeight of the user's screen, in pixels.
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1112,1112,1112,1112,1112 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1336,1336,1336,1336,1336 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 900,900,900,900,900 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 983,983,942,983,983 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 928,928,928,928,928 desired value: 928,928,928,928,928 passed: true,true,true,true,true
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1341,1341,1341,1341,1341 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 860,860,860,860,860 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1260,1260,1260,1260,1260 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 988,988,988,988,988 passed: false,false,false,false,false
screen.widthWidth of the user's screen, in pixels.
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1280,1280,1280,1280,1280 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1607,1607,1607,1607,1607 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1280,1280,1280,1280,1280 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 1600,1600,1600,1600,1600 desired value: 1600,1600,1600,1600,1600 passed: true,true,true,true,true
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1240,1240,1240,1240,1240 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1324,1324,1324,1324,1324 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1306,1306,1306,1306,1306 passed: false,false,false,false,false
screenXPosition, in pixels, of the left edge of the browser window on screen.
  expression: screenX desired expression: 0 actual value: 157,157,0,0,0 desired value: 0,0,0,0,0 passed: false,false,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 595,595,595,595,595 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 4,4,4,4,4 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 699,699,699,699,699 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 542,22,22,22,22 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 729,729,729,729,729 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 413,413,413,413,413 desired value: 0,0,0,0,0 passed: false,false,false,false,false
screenYPosition, in pixels, of the top edge of the browser window on screen.
  expression: screenY desired expression: 0 actual value: 97,97,145,145,145 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 330,330,330,330,330 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 141,109,109,109,109 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 251,251,251,251,251 desired value: 0,0,0,0,0 passed: false,false,false,false,false
System font detectionWeb pages can detect the presence of a font installed on the user's system. The presence or absence of various fonts is commonly used to fingerprint users.
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: false,false,false,false,false
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: false,false,false,false,false
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: false,false,false,false,false
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: false,false,false,false,false
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: true,true,true,true,true
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: false,false,false,false,false
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: true,true,true,true,true
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: true,true,true,true,true
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: false,false,false,false,false
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: false,false,false,false,false
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,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
__hsscHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
__hstcHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
__sDrip.com email address tracking parameter
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
_hsencHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
_openstatYandex tracking parameter
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
dclidDoubleClick Click ID (Google)
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
fbclidFacebook Click Identifier
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
gclidGoogle Click Identifier
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
hsCtaTrackingHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
igshidInstagram tracking parameter
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
mc_eidMailchimp Email ID (email recipient's address)
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
mkt_tokAdobe Marketo tracking parameter
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
ml_subscriberMailerLite email tracking
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
ml_subscriber_hashMailerLite email tracking
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
msclkidMicrosoft Click ID
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
oly_anon_idOmeda marketing 'anonymous' customer id
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
oly_enc_idOmeda marketing 'known' customer id
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
rb_clickidUnknown high-entropy tracking parameter
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
s_cidAdobe Site Catalyst tracking parameter
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
vero_convVero tracking parameter
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
vero_idVero tracking parameter
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
wickedidWicked Reports e-commerce tracking
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
yclidYandex Click ID
  passed: true,true,true,true,true
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,false
  value: 033308043471557136 passed: false,false,false,false,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,true,true,true,true
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: true,true,true,true,true
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,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,true,true,true,true
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false,false,false,false,false
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false,false,false,false,false
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false,false,false,false,false
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: true,true,true,true,true
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false,false,false,false,false
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false,false,false,false,false
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false,false,false,false,false
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false,false,false,false,false
  url: https://aax-us-east.amazon-adsystem.com/x/px passed: false,false,false,false,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,true,true,true,true
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false,false,false,false,false
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false,false,false,false,false
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false,false,false,false,false
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: true,true,true,true,true
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false,false,false,false,false
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false,false,false,false,false
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false,false,false,false,false
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false,false,false,false,false
  url: https://acdn.adnxs.com/dmp/up/pixie.js passed: false,false,false,false,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,true,true,true,true
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: true,true,true,true,true
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,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,true,true,true,true
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false,false,false,false,false
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false,false,false,false,false
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false,false,false,false,false
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: true,true,true,true,true
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false,false,false,false,false
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false,false,false,false,false
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false,false,false,false,false
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false,false,false,false,false
  url: https://pdev.chartbeat.net/ping?h=x&p=x&r=&b= passed: false,false,false,false,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,true,true,true,true
  url: https://csm.da.us.criteo.net/iev passed: false,false,false,false,false
  url: https://csm.da.us.criteo.net/iev passed: false,false,false,false,false
  url: https://csm.da.us.criteo.net/iev passed: false,false,false,false,false
  url: https://csm.da.us.criteo.net/iev passed: true,true,true,true,true
  url: https://csm.da.us.criteo.net/iev passed: false,false,false,false,false
  url: https://csm.da.us.criteo.net/iev passed: false,false,false,false,false
  url: https://csm.da.us.criteo.net/iev passed: false,false,false,false,false
  url: https://csm.da.us.criteo.net/iev passed: false,false,false,false,false
  url: https://csm.da.us.criteo.net/iev passed: false,false,false,false,false
DoubleClick (Google)Tests whether the browser blocks the page from loading the tracker at https://securepubads.g.doubleclick.net/static/glade.js
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: true,true,true,true,true
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: true,true,true,true,true
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,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,true,true,true,true
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: true,true,true,true,true
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,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,true,true,true,true
  url: https://www.googleadservices.com/pagead/conversion.js passed: false,false,false,false,false
  url: https://www.googleadservices.com/pagead/conversion.js passed: false,false,false,false,false
  url: https://www.googleadservices.com/pagead/conversion.js passed: false,false,false,false,false
  url: https://www.googleadservices.com/pagead/conversion.js passed: true,true,true,true,true
  url: https://www.googleadservices.com/pagead/conversion.js passed: false,false,false,false,false
  url: https://www.googleadservices.com/pagead/conversion.js passed: false,false,false,false,false
  url: https://www.googleadservices.com/pagead/conversion.js passed: false,false,false,false,false
  url: https://www.googleadservices.com/pagead/conversion.js passed: false,false,false,false,false
  url: https://www.googleadservices.com/pagead/conversion.js passed: false,false,false,false,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,true,true,true,true
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: true,true,true,true,true
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,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,true,true,true,true
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false,false,false,false,false
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false,false,false,false,false
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false,false,false,false,false
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: true,true,true,true,true
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false,false,false,false,false
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false,false,false,false,false
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false,false,false,false,false
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false,false,false,false,false
  url: https://tpc.googlesyndication.com/sodar/UFYwWwmt.js passed: false,false,false,false,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,true,true,true,true
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: true,true,true,true,true
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,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,true,true,true,true
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: true,true,true,true,true
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,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,true,true,true,true
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: true,true,true,true,true
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,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,true,true,true,true
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: true,true,true,true,true
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,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,true,true,true,true
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: true,true,true,true,true
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,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,true,true,true,true
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false,false,false,false,false
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false,false,false,false,false
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false,false,false,false,false
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: true,true,true,true,true
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false,false,false,false,false
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false,false,false,false,false
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false,false,false,false,false
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false,false,false,false,false
  url: https://cdn.taboola.com/libtrc/UNIQUEID/tfa.js passed: false,false,false,false,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,true,true,true,true
  url: https://static.ads-twitter.com/uwt.js passed: false,false,false,false,false
  url: https://static.ads-twitter.com/uwt.js passed: false,false,false,false,false
  url: https://static.ads-twitter.com/uwt.js passed: false,false,false,false,false
  url: https://static.ads-twitter.com/uwt.js passed: true,true,true,true,true
  url: https://static.ads-twitter.com/uwt.js passed: false,false,false,false,false
  url: https://static.ads-twitter.com/uwt.js passed: false,false,false,false,false
  url: https://static.ads-twitter.com/uwt.js passed: false,false,false,false,false
  url: https://static.ads-twitter.com/uwt.js passed: false,false,false,false,false
  url: https://static.ads-twitter.com/uwt.js passed: false,false,false,false,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,true,true,true,true
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: true,true,true,true,true
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,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,true,true,true,true
  url: https://mc.yandex.ru/metrika/tag.js passed: false,false,false,false,false
  url: https://mc.yandex.ru/metrika/tag.js passed: false,false,false,false,false
  url: https://mc.yandex.ru/metrika/tag.js passed: false,false,false,false,false
  url: https://mc.yandex.ru/metrika/tag.js passed: true,true,true,true,true
  url: https://mc.yandex.ru/metrika/tag.js passed: false,false,false,false,false
  url: https://mc.yandex.ru/metrika/tag.js passed: false,false,false,false,false
  url: https://mc.yandex.ru/metrika/tag.js passed: false,false,false,false,false
  url: https://mc.yandex.ru/metrika/tag.js passed: false,false,false,false,false
  url: https://mc.yandex.ru/metrika/tag.js passed: false,false,false,false,false