Nightly Builds
(click anywhere for more info)


brave
1.37

chrome
100.0

edge
100.0

firefox
99.0a1

opera
85.0

safari
15.4

tor
tbb-nightly.2022

vivaldi
5.2
State Partitioning testsA common vulnerability of web browsers is that they allow tracking companies to 'tag' your browser with some data ('state') that identifies you. When third-party trackers are embedded in websites, they can see this identifying data as you browse to different websites. Fortunately, it is possible for this category of leaks to be fixed by partitioning all data stored in the browser such that no data can be shared between websites.
Alt-SvcAlt-Svc allows the server to indicate to the web browser that a resource should be loaded on a different server. Because this is a persistent setting, it could be used to track users across websites if it is not correctly partitioned.
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h2, h2, h2, h3, h2 result, different first party: h2, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, true, true, false, 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: 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, h2, h2, h2 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, 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: 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
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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 65d2e9a9-82af-4b62-af80-c5c4149a400c, 42cc2634-2bdc-4d28-8e02-99ed4c33492f, 995ddf97-bedc-4426-bffc-7941166d2b85, 8d10a1b1-ee1b-4b2d-ba10-07eb1bb3bae9, 90cfd10b-88a1-4fc6-b017-a827c147417f result, different first party: 65d2e9a9-82af-4b62-af80-c5c4149a400c, 42cc2634-2bdc-4d28-8e02-99ed4c33492f, 995ddf97-bedc-4426-bffc-7941166d2b85, 8d10a1b1-ee1b-4b2d-ba10-07eb1bb3bae9, 90cfd10b-88a1-4fc6-b017-a827c147417f unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f result, different first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa result, different first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: be86bce2-f67d-476d-8dd3-fd53b64f792f, ebba6da8-34c9-455b-bad8-ae387f4c8f43, de9a11c6-443d-497d-87b8-6d423849ab9b, ddf61f77-6a67-4fab-a5a5-98d5596129d3, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8 result, different first party: be86bce2-f67d-476d-8dd3-fd53b64f792f, ebba6da8-34c9-455b-bad8-ae387f4c8f43, de9a11c6-443d-497d-87b8-6d423849ab9b, ddf61f77-6a67-4fab-a5a5-98d5596129d3, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b, 05a98ac4-e3b1-4993-a3ad-778da095d874 result, different first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b, 05a98ac4-e3b1-4993-a3ad-778da095d874 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 5a02666a-2448-4f7d-aa4f-238fc816de54, 2d3b6034-f98a-4950-858c-72303c6331ff, 26395b62-4c2e-4630-ba34-a146132e518f, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73 result, different first party: 5a02666a-2448-4f7d-aa4f-238fc816de54, 2d3b6034-f98a-4950-858c-72303c6331ff, 26395b62-4c2e-4630-ba34-a146132e518f, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 361f8100-d24b-440e-af0f-99cb212b370c, 30e6e6ab-d9c4-4900-ad29-691343587692, 7f158e36-e340-477f-80da-504fe003d765, 402299ce-b33d-4590-b905-64e905aefaa6, b21f453c-dccc-4365-b852-fb8d345a2149 result, different first party: Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 result, different first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 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: 65d2e9a9-82af-4b62-af80-c5c4149a400c, 42cc2634-2bdc-4d28-8e02-99ed4c33492f, 995ddf97-bedc-4426-bffc-7941166d2b85, 8d10a1b1-ee1b-4b2d-ba10-07eb1bb3bae9, 90cfd10b-88a1-4fc6-b017-a827c147417f 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: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f result, different first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f 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: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa result, different first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa 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: be86bce2-f67d-476d-8dd3-fd53b64f792f, ebba6da8-34c9-455b-bad8-ae387f4c8f43, de9a11c6-443d-497d-87b8-6d423849ab9b, ddf61f77-6a67-4fab-a5a5-98d5596129d3, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8 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: f752f4f2-f12c-4ff7-9940-8c711a2f3957, f752f4f2-f12c-4ff7-9940-8c711a2f3957, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b, 05a98ac4-e3b1-4993-a3ad-778da095d874 result, different first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, 265a20ed-c7c7-4b0d-9014-a04e407e7479, 05a98ac4-e3b1-4993-a3ad-778da095d874 unsupported: false, false, false, false, false passed: false, true, false, true, 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: 5a02666a-2448-4f7d-aa4f-238fc816de54, 2d3b6034-f98a-4950-858c-72303c6331ff, 26395b62-4c2e-4630-ba34-a146132e518f, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73 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: 361f8100-d24b-440e-af0f-99cb212b370c, 30e6e6ab-d9c4-4900-ad29-691343587692, 7f158e36-e340-477f-80da-504fe003d765, 402299ce-b33d-4590-b905-64e905aefaa6, b21f453c-dccc-4365-b852-fb8d345a2149 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: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 result, different first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 7156300943180247, 7156300943180247, 7156300943180247, 7156300943180247, 7156300943180247 result, different first party: Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398 result, different first party: 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9 result, different first party: bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: be86bce2-f67d-476d-8dd3-fd53b64f792f, ebba6da8-34c9-455b-bad8-ae387f4c8f43, de9a11c6-443d-497d-87b8-6d423849ab9b, ddf61f77-6a67-4fab-a5a5-98d5596129d3, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 5525088998911329, 5525088998911329, 5525088998911329, 5525088998911329, 5525088998911329 result, different first party: 5525088998911329, 5525088998911329, 5525088998911329, 5525088998911329, 5525088998911329 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 5a02666a-2448-4f7d-aa4f-238fc816de54, 2d3b6034-f98a-4950-858c-72303c6331ff, 26395b62-4c2e-4630-ba34-a146132e518f, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73 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: 48672960489762285, 48672960489762285, 48672960489762285, 48672960489762285, 48672960489762285 result, different first party: 48672960489762285, 48672960489762285, 48672960489762285, 48672960489762285, 48672960489762285 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
cookie (HTTP)The cookie, first introduced by Netscape in 1994, is a small amount of data stored by your browser on a website's behalf. It has legitimate uses, but it is also the classic cross-site tracking mechanism, and today still the most popular method of tracking users across websites. Browsers can stop cookies from being used for cross-site tracking by either blocking or partitioning them.
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=(\S+)/)[1]: null; } result, same first party: 4355ba40-1229-4b75-aa6f-ea956a950063_http, 65d2e9a9-82af-4b62-af80-c5c4149a400c_http, 42cc2634-2bdc-4d28-8e02-99ed4c33492f_http, 995ddf97-bedc-4426-bffc-7941166d2b85_http, 8d10a1b1-ee1b-4b2d-ba10-07eb1bb3bae9_http result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=(\S+)/)[1]: null; } result, same first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e_http, a13c184b-3371-40fe-9e90-dee502b98e17_http, b4c21ac9-140e-4e20-a223-e7187c8cf254_http, a8c23ee4-7242-47a6-a994-49faa048917b_http, 8e33e10d-8300-45d1-8f84-7be596c2368f_http result, different first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e_http, a13c184b-3371-40fe-9e90-dee502b98e17_http, b4c21ac9-140e-4e20-a223-e7187c8cf254_http, a8c23ee4-7242-47a6-a994-49faa048917b_http, 8e33e10d-8300-45d1-8f84-7be596c2368f_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=(\S+)/)[1]: null; } result, same first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f_http, a36f35b8-5681-46e7-a292-1c07a2ba5f9a_http, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2_http, 11cd412a-d0db-4d0f-9966-911a32edf674_http, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa_http result, different first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f_http, a36f35b8-5681-46e7-a292-1c07a2ba5f9a_http, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2_http, 11cd412a-d0db-4d0f-9966-911a32edf674_http, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=(\S+)/)[1]: null; } result, same first party: be86bce2-f67d-476d-8dd3-fd53b64f792f_http, ebba6da8-34c9-455b-bad8-ae387f4c8f43_http, de9a11c6-443d-497d-87b8-6d423849ab9b_http, ddf61f77-6a67-4fab-a5a5-98d5596129d3_http, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8_http 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) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=(\S+)/)[1]: null; } result, same first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957_http, f752f4f2-f12c-4ff7-9940-8c711a2f3957_http, 86507250-23c0-4518-927a-cac1ce0175e0_http, 265a20ed-c7c7-4b0d-9014-a04e407e7479_http, eaa7c529-08f8-47a7-8d14-60288559ba9b_http result, different first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957_http, f752f4f2-f12c-4ff7-9940-8c711a2f3957_http, 86507250-23c0-4518-927a-cac1ce0175e0_http, 265a20ed-c7c7-4b0d-9014-a04e407e7479_http, eaa7c529-08f8-47a7-8d14-60288559ba9b_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=(\S+)/)[1]: null; } result, same first party: 5a02666a-2448-4f7d-aa4f-238fc816de54_http, 2d3b6034-f98a-4950-858c-72303c6331ff_http, 26395b62-4c2e-4630-ba34-a146132e518f_http, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2_http, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73_http 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) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=(\S+)/)[1]: null; } result, same first party: 361f8100-d24b-440e-af0f-99cb212b370c_http, 30e6e6ab-d9c4-4900-ad29-691343587692_http, 7f158e36-e340-477f-80da-504fe003d765_http, 402299ce-b33d-4590-b905-64e905aefaa6_http, b21f453c-dccc-4365-b852-fb8d345a2149_http result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=(\S+)/)[1]: null; } result, same first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8_http, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0_http, ab70ed35-5007-47e0-ac17-0e0d3e7472cd_http, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f_http, d6e36026-877f-4ebb-875a-102ca4d20f54_http result, different first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8_http, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0_http, ab70ed35-5007-47e0-ac17-0e0d3e7472cd_http, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f_http, d6e36026-877f-4ebb-875a-102ca4d20f54_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
cookie (JS)The cookie, first introduced by Netscape in 1994, is a small amount of data stored by your browser on a website's behalf. It has legitimate uses, but it is also the classic cross-site tracking mechanism, and today still the most popular method of tracking users across websites. Browsers can stop cookies from being used for cross-site tracking by either blocking or partitioning them.
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 65d2e9a9-82af-4b62-af80-c5c4149a400c_js, 65d2e9a9-82af-4b62-af80-c5c4149a400c_js, 42cc2634-2bdc-4d28-8e02-99ed4c33492f_js, 995ddf97-bedc-4426-bffc-7941166d2b85_js, 8d10a1b1-ee1b-4b2d-ba10-07eb1bb3bae9_js result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e_js, a13c184b-3371-40fe-9e90-dee502b98e17_js, b4c21ac9-140e-4e20-a223-e7187c8cf254_js, a8c23ee4-7242-47a6-a994-49faa048917b_js, 8e33e10d-8300-45d1-8f84-7be596c2368f_js result, different first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e_js, a13c184b-3371-40fe-9e90-dee502b98e17_js, b4c21ac9-140e-4e20-a223-e7187c8cf254_js, a8c23ee4-7242-47a6-a994-49faa048917b_js, 8e33e10d-8300-45d1-8f84-7be596c2368f_js unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f_js, a36f35b8-5681-46e7-a292-1c07a2ba5f9a_js, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2_js, 11cd412a-d0db-4d0f-9966-911a32edf674_js, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa_js result, different first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f_js, a36f35b8-5681-46e7-a292-1c07a2ba5f9a_js, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2_js, 11cd412a-d0db-4d0f-9966-911a32edf674_js, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa_js unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: be86bce2-f67d-476d-8dd3-fd53b64f792f_js, ebba6da8-34c9-455b-bad8-ae387f4c8f43_js, de9a11c6-443d-497d-87b8-6d423849ab9b_js, ddf61f77-6a67-4fab-a5a5-98d5596129d3_js, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8_js 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) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957_js, f752f4f2-f12c-4ff7-9940-8c711a2f3957_js, 86507250-23c0-4518-927a-cac1ce0175e0_js, 265a20ed-c7c7-4b0d-9014-a04e407e7479_js, eaa7c529-08f8-47a7-8d14-60288559ba9b_js result, different first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957_js, f752f4f2-f12c-4ff7-9940-8c711a2f3957_js, 86507250-23c0-4518-927a-cac1ce0175e0_js, 265a20ed-c7c7-4b0d-9014-a04e407e7479_js, eaa7c529-08f8-47a7-8d14-60288559ba9b_js unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 5a02666a-2448-4f7d-aa4f-238fc816de54_js, 2d3b6034-f98a-4950-858c-72303c6331ff_js, 26395b62-4c2e-4630-ba34-a146132e518f_js, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2_js, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73_js 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) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 361f8100-d24b-440e-af0f-99cb212b370c_js, 30e6e6ab-d9c4-4900-ad29-691343587692_js, 7f158e36-e340-477f-80da-504fe003d765_js, 402299ce-b33d-4590-b905-64e905aefaa6_js, b21f453c-dccc-4365-b852-fb8d345a2149_js result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8_js, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0_js, ab70ed35-5007-47e0-ac17-0e0d3e7472cd_js, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f_js, d6e36026-877f-4ebb-875a-102ca4d20f54_js result, different first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8_js, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0_js, ab70ed35-5007-47e0-ac17-0e0d3e7472cd_js, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f_js, d6e36026-877f-4ebb-875a-102ca4d20f54_js 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_3326356235379824, fake_2238511985835534, fake_5007076577110183, fake_22482799884821647, fake_5837720908259214 result, different first party: fake_5115804036243572, fake_9444513640038128, fake_8312173742690205, fake_06859462074872447, fake_38636366735212024 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_9367312309364371, fake_31881889053975865, fake_070869497937178, fake_7120970553399983, fake_4109401463843625 result, different first party: fake_9367312309364371, fake_31881889053975865, fake_070869497937178, fake_7120970553399983, fake_4109401463843625 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_2857958572328958, fake_6450490831959945, fake_2553535338339197, fake_385291423396692, fake_49521516468137916 result, different first party: fake_5984339424462768, fake_6450490831959945, fake_2553535338339197, fake_385291423396692, fake_49521516468137916 unsupported: false, false, false, false, false passed: true, 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_3570918779733099, fake_6623899739537411, fake_29953276815822627, fake_18538432047324238, fake_16959439588644143 result, different first party: fake_2051104426676975, fake_2977748953547228, fake_1314790696043766, fake_6948618849637849, fake_9936168913833427 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_22127520039548587, fake_744595086348625, fake_5328922024566602, fake_2666831182671825, fake_020116715704088017 result, different first party: fake_2746686373164118, fake_4914757010904405, fake_7521638690972439, fake_5330791433336373, fake_4933867466001072 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_5167244012044367, fake_8591297952958157, fake_2592786153314912, fake_12724503475915871, fake_876232979198754 result, different first party: fake_3233634385829802, fake_2526540436714442, fake_1567226460014448, fake_0005255900054839113, fake_018442287355495912 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_1875148567266527, fake_5556654317674263, fake_2519280558321144, fake_027389292897866957, fake_09224175333830065 result, different first party: fake_32515637681928156, fake_5043297155087305, fake_0951069169366272, fake_08568866822097632, fake_31861301352390714 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_11245266636507623, fake_7632649144019812, fake_7901080970841079, fake_021450575666912775, fake_46292900822099914 result, different first party: fake_9670777811506446, fake_4182025024632272, fake_3356790479879781, fake_5216473776008808, fake_21462579603312215 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: 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: 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: 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: 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: 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
  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: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 65d2e9a9-82af-4b62-af80-c5c4149a400c, 42cc2634-2bdc-4d28-8e02-99ed4c33492f, 995ddf97-bedc-4426-bffc-7941166d2b85, 995ddf97-bedc-4426-bffc-7941166d2b85, 90cfd10b-88a1-4fc6-b017-a827c147417f result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f result, different first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa result, different first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: be86bce2-f67d-476d-8dd3-fd53b64f792f, ebba6da8-34c9-455b-bad8-ae387f4c8f43, de9a11c6-443d-497d-87b8-6d423849ab9b, ddf61f77-6a67-4fab-a5a5-98d5596129d3, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b, 05a98ac4-e3b1-4993-a3ad-778da095d874 result, different first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957, f752f4f2-f12c-4ff7-9940-8c711a2f3957, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b, eaa7c529-08f8-47a7-8d14-60288559ba9b unsupported: false, false, false, false, false passed: false, true, false, false, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: 5a02666a-2448-4f7d-aa4f-238fc816de54, 2d3b6034-f98a-4950-858c-72303c6331ff, 26395b62-4c2e-4630-ba34-a146132e518f, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 361f8100-d24b-440e-af0f-99cb212b370c, 30e6e6ab-d9c4-4900-ad29-691343587692, 7f158e36-e340-477f-80da-504fe003d765, 402299ce-b33d-4590-b905-64e905aefaa6, b21f453c-dccc-4365-b852-fb8d345a2149 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 result, different first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 65d2e9a9-82af-4b62-af80-c5c4149a400c, 42cc2634-2bdc-4d28-8e02-99ed4c33492f, 995ddf97-bedc-4426-bffc-7941166d2b85, 995ddf97-bedc-4426-bffc-7941166d2b85, 90cfd10b-88a1-4fc6-b017-a827c147417f result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f result, different first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa result, different first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: be86bce2-f67d-476d-8dd3-fd53b64f792f, ebba6da8-34c9-455b-bad8-ae387f4c8f43, de9a11c6-443d-497d-87b8-6d423849ab9b, ddf61f77-6a67-4fab-a5a5-98d5596129d3, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b, 05a98ac4-e3b1-4993-a3ad-778da095d874 result, different first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957, f752f4f2-f12c-4ff7-9940-8c711a2f3957, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b, eaa7c529-08f8-47a7-8d14-60288559ba9b unsupported: false, false, false, false, false passed: false, true, false, false, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 5a02666a-2448-4f7d-aa4f-238fc816de54, 2d3b6034-f98a-4950-858c-72303c6331ff, 26395b62-4c2e-4630-ba34-a146132e518f, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 361f8100-d24b-440e-af0f-99cb212b370c, 30e6e6ab-d9c4-4900-ad29-691343587692, 7f158e36-e340-477f-80da-504fe003d765, 402299ce-b33d-4590-b905-64e905aefaa6, b21f453c-dccc-4365-b852-fb8d345a2149 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 result, different first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 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: 30eb2947089be914ee7f5b41233fcc5c, b304aa13e43d7a5fdd4f5aab057299b0, bee3d106c99c4216d76838fa60af0fd3, 760ba1540637330fe6dd4d84f3bd9bff, 0bd6cba398a3fb0c6fa8c1ae6e426724 result, different first party: 7fad8cb0faac3fa417cc1074dc7ed985, c7e98fdfb5b5eede8b5ae2ec69a4b65b, 98df333fd0a4bad356ef06e085c7d20d, 415c9cc61ce713eb3b25755eba4ddb0a, 5e0a07493d6461a558faf3f1a3d8cd3a unsupported: true, true, true, false, false passed: , 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: f2fff1c7b08e2b62a672e3d430376a25, 40debcb98d24d5eb78deafc3e8a48235, 63104225b00e53197525050a1ac5356f, 5f34cb966c0fa508699d6a277607b1b7, 8911b5d4bd2af5657734008542160e55 result, different first party: f2fff1c7b08e2b62a672e3d430376a25, 40debcb98d24d5eb78deafc3e8a48235, 63104225b00e53197525050a1ac5356f, 5f34cb966c0fa508699d6a277607b1b7, 8911b5d4bd2af5657734008542160e55 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: c903f5abdac9ab1197d9ef3ad1476cc6, 6dbffb9addf2e700dfa399de449761a5, f7de64168213934cb736543f4358b517, 6903c8df074ffb257ea87d491fb93717, d945d02583706508d955c6eb883a0e2c result, different first party: c903f5abdac9ab1197d9ef3ad1476cc6, 6dbffb9addf2e700dfa399de449761a5, f7de64168213934cb736543f4358b517, 6903c8df074ffb257ea87d491fb93717, d945d02583706508d955c6eb883a0e2c 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: 40a680f591d4111176ed2e4c39049dbd, 12f8823660da055b2a0432054d78ef97, a0ca29442ff3901341bfc069bbd3ccdb, 53ba2d835cd866961735cf878ed082e7, 2ec43064cd39d9b643887b5fd9c2856d result, different first party: 661f419f8c43ec547a41f125ea619f6b, ac8ab58bf458b6533e8e65253a2278a5, bd24d24fe65a51e88261d294d01dd0e4, 67d3048afeaddb5f5a965e880660271a, ccad2e390e7c2df88592e85224f10e28 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: bf27f7fd4a8fce18298a7f6ce1e85499, 1eb48d9f90829562a85de555f2be6d0e, 13392fc66f1852a5723b84d3226aca0c, 30b7c7fac6f7e4d79597125fb161e644, 014b191fbd349e63eb5e4689e8fa3a7d result, different first party: bf27f7fd4a8fce18298a7f6ce1e85499, 1eb48d9f90829562a85de555f2be6d0e, 13392fc66f1852a5723b84d3226aca0c, 30b7c7fac6f7e4d79597125fb161e644, 014b191fbd349e63eb5e4689e8fa3a7d 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: 599c650d5b0b3d09a6d6e177e5bc86a9, 9a5fa168ad287134c7ebbb7637cc744e, 11d0dfac3d9342e84e15dbe82007d3e2, 8baabd5a708cb3b8ac8023f983e2222c, 5b231cc4994676f3a205834623a5ddf3 result, different first party: 599c650d5b0b3d09a6d6e177e5bc86a9, 9a5fa168ad287134c7ebbb7637cc744e, 11d0dfac3d9342e84e15dbe82007d3e2, 8baabd5a708cb3b8ac8023f983e2222c, 5b231cc4994676f3a205834623a5ddf3 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: 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
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
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: 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: 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
  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: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false 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: 4355ba40-1229-4b75-aa6f-ea956a950063, 65d2e9a9-82af-4b62-af80-c5c4149a400c, 42cc2634-2bdc-4d28-8e02-99ed4c33492f, 995ddf97-bedc-4426-bffc-7941166d2b85, 8d10a1b1-ee1b-4b2d-ba10-07eb1bb3bae9 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: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f result, different first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f 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: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa result, different first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa 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: be86bce2-f67d-476d-8dd3-fd53b64f792f, ebba6da8-34c9-455b-bad8-ae387f4c8f43, de9a11c6-443d-497d-87b8-6d423849ab9b, ddf61f77-6a67-4fab-a5a5-98d5596129d3, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8 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: f752f4f2-f12c-4ff7-9940-8c711a2f3957, f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b result, different first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957, f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b 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: 5a02666a-2448-4f7d-aa4f-238fc816de54, 2d3b6034-f98a-4950-858c-72303c6331ff, 26395b62-4c2e-4630-ba34-a146132e518f, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73 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: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 result, different first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 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: 4355ba40-1229-4b75-aa6f-ea956a950063, 65d2e9a9-82af-4b62-af80-c5c4149a400c, 42cc2634-2bdc-4d28-8e02-99ed4c33492f, 995ddf97-bedc-4426-bffc-7941166d2b85, 8d10a1b1-ee1b-4b2d-ba10-07eb1bb3bae9 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: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f result, different first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f 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: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa result, different first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa 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: be86bce2-f67d-476d-8dd3-fd53b64f792f, ebba6da8-34c9-455b-bad8-ae387f4c8f43, de9a11c6-443d-497d-87b8-6d423849ab9b, ddf61f77-6a67-4fab-a5a5-98d5596129d3, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8 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: f752f4f2-f12c-4ff7-9940-8c711a2f3957, f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b result, different first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957, f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b 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: 5a02666a-2448-4f7d-aa4f-238fc816de54, 2d3b6034-f98a-4950-858c-72303c6331ff, 26395b62-4c2e-4630-ba34-a146132e518f, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73 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: 361f8100-d24b-440e-af0f-99cb212b370c, 30e6e6ab-d9c4-4900-ad29-691343587692, 7f158e36-e340-477f-80da-504fe003d765, 402299ce-b33d-4590-b905-64e905aefaa6, b21f453c-dccc-4365-b852-fb8d345a2149 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: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 result, different first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 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: 65d2e9a9-82af-4b62-af80-c5c4149a400c, 65d2e9a9-82af-4b62-af80-c5c4149a400c, 42cc2634-2bdc-4d28-8e02-99ed4c33492f, 995ddf97-bedc-4426-bffc-7941166d2b85, 8d10a1b1-ee1b-4b2d-ba10-07eb1bb3bae9 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: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f result, different first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f 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: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa result, different first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa 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: be86bce2-f67d-476d-8dd3-fd53b64f792f, ebba6da8-34c9-455b-bad8-ae387f4c8f43, de9a11c6-443d-497d-87b8-6d423849ab9b, ddf61f77-6a67-4fab-a5a5-98d5596129d3, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8 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: f752f4f2-f12c-4ff7-9940-8c711a2f3957, f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b result, different first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957, f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b 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: 5a02666a-2448-4f7d-aa4f-238fc816de54, 2d3b6034-f98a-4950-858c-72303c6331ff, 26395b62-4c2e-4630-ba34-a146132e518f, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73 result, different first party: Error: undefined is not an object (evaluating 'queryResult.held[0].name'), Error: undefined is not an object (evaluating 'queryResult.held[0].name'), Error: undefined is not an object (evaluating 'queryResult.held[0].name'), Error: undefined is not an object (evaluating 'queryResult.held[0].name'), Error: undefined is not an object (evaluating 'queryResult.held[0].name') unsupported: false, false, false, false, false passed: 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: 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: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 result, different first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 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: 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
  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: 1, 1, 1, 1, 1 result, different first party: 1, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: false, 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: be86bce2-f67d-476d-8dd3-fd53b64f792f, ebba6da8-34c9-455b-bad8-ae387f4c8f43, de9a11c6-443d-497d-87b8-6d423849ab9b, ddf61f77-6a67-4fab-a5a5-98d5596129d3, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8 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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: , , , , result, different first party: , , , , unsupported: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: 5a02666a-2448-4f7d-aa4f-238fc816de54, 2d3b6034-f98a-4950-858c-72303c6331ff, 26395b62-4c2e-4630-ba34-a146132e518f, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73 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: , , , , 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: 4355ba40-1229-4b75-aa6f-ea956a950063, 65d2e9a9-82af-4b62-af80-c5c4149a400c, 42cc2634-2bdc-4d28-8e02-99ed4c33492f, 995ddf97-bedc-4426-bffc-7941166d2b85, 8d10a1b1-ee1b-4b2d-ba10-07eb1bb3bae9 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: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f result, different first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f 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: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa result, different first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa 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: be86bce2-f67d-476d-8dd3-fd53b64f792f, ebba6da8-34c9-455b-bad8-ae387f4c8f43, de9a11c6-443d-497d-87b8-6d423849ab9b, ddf61f77-6a67-4fab-a5a5-98d5596129d3, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8 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: (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: f752f4f2-f12c-4ff7-9940-8c711a2f3957, f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b result, different first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957, f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b 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: 361f8100-d24b-440e-af0f-99cb212b370c, 30e6e6ab-d9c4-4900-ad29-691343587692, 7f158e36-e340-477f-80da-504fe003d765, 402299ce-b33d-4590-b905-64e905aefaa6, b21f453c-dccc-4365-b852-fb8d345a2149 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: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 result, different first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 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: 3ded5d3b21c7239386be4a262eca7e0f6fd982ef33d4850e2fce849c7b10d7d7, 63ae681eef7ac5e5936d746380d84ebf321d99d8f1128a019113d1ec39f6b042, 164cd33cfcd2cffaa8a5d839bdc06930f7d0c8da17947764473bff8ad4290d95, 8e4cb5be324e4929f49ec559ccdb72416f56d7d05550c48d576f02d6f8e2f086, 50e2ffc998836f3930350c01f8314382e284543503fabfe4dd1a7efac7beae49 result, different first party: 04308c61db038dbd2c2633bde3c3676de93a6c1650f6ef2ec6820c4dbe1221fd, 0430cb15cfa365c988fd79c028ffa6bf5372096fe7a969b1399e9d1a2a1bfd7e, 0430e4420fd1aefe878c33124b495e946a6b3d0332a97ec3feaad6b6f140933e, 043063f23557c2079a17229e2b2c9d2e6e8763a80ad1326cbb26a7622317062e, 04302742f0031203f8203686c02a83ee3cf7b2a13b339171e0caec05f06c334e 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: a4fc6ccfb3a615c2c29182fd47591c54eb039e15505e04fcbf58d9a0ddb98323, 52470476e9c65d20327b2db47c19755f31b6524327f5fd5075e3f78e6d78f403, fbd5bd96d8e2ee0e60449a026d1748354326f9c2eeb365a629568fb15ff9e434, 403970d9086cf9bc5c5704f2fbf82c60bdfc43f6051d8d7a688128cb3a0bd29e, 947b3cad55f17f491a4054f28f6d714f36356e9fe3e21297842198cb45f81127 result, different first party: edde6482396e9c6dec047bc56b0fa696888a7cfab55a8c65bdc987fd6a89be27, 92ebc2d7492fdab18b3927cbf0dd7f16cf09974c09acb3325f9159d9c28f6aed, 729979707b248cc6b4a3845c3a85d1d7eb4d801c067af994cb4fc8fb0d9a3a4d, 4a914d11bf248600059e922405b14ddebc4e8667e0fbf51ed5dbab32728676ff, 8b4d598e61d372bfc1b6119e6d9fc6886a551946adc9fab9ce1eaa9884125f8d 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: d56a90be674677f76e858b8ba62e60cbc02db391786ef05c716f84528eb1e7fa, 1e6e9ac046770616e6793962136ada15baa044ff4c9bc2cb4236c734a1a80549, 30b1ff69df735d4b9706dfb9313027dc2f47c26c55f6e58e47ba06540956e15f, 187acce918500468df5e465880e35a047cb1f0c5443b1e6fbf0fbf00a08c1899, 1bd4cc900445ee8e1a5dbfb92c16d21d8f3793d2cae1e3a48aac62451833af4e result, different first party: 02d891a53b7bed10ab4482dfd7c9711307169e7fd095281b0565489599213f33, eec110eb615bc49b1f4a05092695a11d9b22ef1260c54d8e76528bc75fd23380, f910151f2c4161dccde89cf0fb35c3382624cce0f4779db7be01ffa2f9b37c0b, 0911e180301c35e43890f634b539acb6e3cb9efd568b36126e454758901b6916, e05a3dbe59aeb604782d0317f4a5a226483bb89d325add5f9bb07db99b3e2574 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: 2f0bf506a9dbe500538b190c437809b9eaf047e9887a31f97f5765b23f8c5d7e, 91276129c56f2ed248331577f38f4ecbee348705d33ddcb319cf4e0832a70af5, 816e9b65d5f61df80c144d6679ace772b9aaeb1f7c90449f0a51aaec8fde8df4, 984ac6723ff63f75e700b567fd8f48331f70d5ab5b0568c0d880e767b86d9bae, 50b80d4bebfd9defa375078e6b4c311b34f7e3ae5e661f7e402da379c5203126 result, different first party: 0430e273a6f430c9c78bfb7aa715d470ccf91f747f2922dd6f7054b2937f7eba, 043043e9f93497bb4150a80ff4713bc6a963985801d00b5f6f17c7486bfd05bc, 04301ec7205a65f8f9eb1058450d27e05261a3cb8e75d4cf2cb3e031aabb4dc8, 043025524beed0a55395c5b870c6e284a9fb66e6da6376a3d0a1b91d4fdd03c3, 0430a44d9831036a8d40dc8a9a9dcffe3aef2a3b6d2a80c05ff474893e52c1ea 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: 9b1de77fa258b487cd8d480065f70af4d935af7ead0aa2e752012bd2381c72bb, 1c56ef666758880591975284017febb6bfb00138d4c86a5fb3c8600ee99c356a, e7f3c6b3305434aa7e4fb87a0d24e607d95190b2f270db386d647e4c11179eed, 0f2def811ea7ccf185a13de659caa13e00fd5444d1711a4a360ff0af84235a81, b270e19088376bafc013b7538868bacb73efd5f5b3b9893b216572c437d2b6a8 result, different first party: ddacd33b68bf706ec9843353f87352e8af603659ba0b9f4cd80c647021763555, 00d57851cbb8ccda701893c04697782b93603a27fd5086429e33c0998e0e285c, b5ecfd79b1d512ef7aff74ee234e628a71f14104dcd8fe4b850352595322513b, 0231bd3d42d5597720302d9bd919fe97b6d8917b621591dca94571e7ea04fc7d, ab79e86dde26b1c03350385e4fae022cc214733b7f931e8b149ba3fcc69054cc 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: 996d121bd7a12c4100e28c02c98599e12878f5fe21826d8fab654fbcc1cc93e6, e1e4f5845f90167d3c8248889377ad01159d034d90f7f6d14a8c8192372c0b64, 959be7230b8ad8e7710e44ccc763c66d899bb4e6b334c4f86414a544e483aa2e, 487cbcb84c01472593782954b576fc3a5504809970bd33796e0381a1a6f00823, aecc8f371584c84395d395485169e8b0d0b2cf4700f8a7a6a5cc1acb4dc32f20 result, different first party: b565cbf6f0436335382f5d0a07222043e155832e7964ed939af8dc62774e93a4, 18e25c9340b66a4e23b47cac210dc783eafdae1ea10a257cffa36a8a50f08f49, 549c4de0f0696c6777594603cd71ed38296506eba3951539a1f46ef08595dc24, ab132f319caa90aeed18daae0b16fcd05b26a5f2193f951b323e3a4e53c7372b, e7bf7dfb20cbd58b0968e238f3918c14cff6800d5873ff0e92a7325389e9bec9 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: ce3bf6679b51bb2beb69ede318ab28839db25c59feff9f5384a2e31858145e74, 472e88a22494b5700413323c10bc508f734a402c665ec28651eefb558da044b4, 3cd0615e4f956c792c813b3c038ed1d1bb05302b94364c2672bbf988f80d5623, 356c75616f1156e50bd7a36a5ac34c1fd617c23fa74d8108169ac57e80ccdde3, ef2f8cc68ea0d840f483a207677791fe589e8b35b7585145afaeae05fdbedfe4 result, different first party: 6aaaf7ce53e6e8a99aa0492159e734a7ebe951b3afdd477313e0151a7897cab7, 47555eb70bfb66520c015319eb3cef221f5d0492fff0766fcc8c92da6c5bd46f, 37b25996dcb2d6e2feaafd78e12b771b589244ab48beb7305afd4e127ccde9b0, 0fc16241cb1ee2f0ae24e9c2fa7f2bca01d4d472d9a2d393b9dfb42cb11310a4, f40d4ef99406b06be892aa3c2ded61e2f0ac70843ebc80409cd37481f5e6b79d 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: 1aa73aaffa6d71eade915fd456e7de18ee9de99a1f86d6e1ca283ea316636f85, b672a6d183faf9b58d9eabb6fd7067fe121998544ba868178215e51dfa7e941a, b974e284cebfa3620144ede80c3264f6b49b8c459f4b83714a793e0e8fe9325b, 6fe6db716ba4c6e0873283e2b964910ac606c0864f5bcd9f3309eb727559d5ce, cbc03679102b783805c3d27fa8b3cf273685bc6aaeac17214294f0dba20aba84 result, different first party: d47092c8755894d65a3083dc8d0a9b79f80a8a55f49a694f063acc689f26c5fb, 3804f8836bfaeee4b246007a1696dd3bfba1e4b126059397aa0c3fb848e59c3a, 15c284844b81da99b56788b1ea4a17d581cc8b6181eb2f0b2fb68aab29de09f6, 9f93f51fc870f22fdc4dbd15d54893419e7c871a7cdfa7dadba21571b15e3a84, 56a6d5c2436269d947aca803f425decc75687c8b17fc78a24965b6c5ce3afd35 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: 4355ba40-1229-4b75-aa6f-ea956a950063, 65d2e9a9-82af-4b62-af80-c5c4149a400c, 42cc2634-2bdc-4d28-8e02-99ed4c33492f, 995ddf97-bedc-4426-bffc-7941166d2b85, 8d10a1b1-ee1b-4b2d-ba10-07eb1bb3bae9 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: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f 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: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa 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: f752f4f2-f12c-4ff7-9940-8c711a2f3957, f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b 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: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 result, different first party: Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
XMLHttpRequest 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: 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
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: 65d2e9a9-82af-4b62-af80-c5c4149a400c, 42cc2634-2bdc-4d28-8e02-99ed4c33492f, 995ddf97-bedc-4426-bffc-7941166d2b85, 8d10a1b1-ee1b-4b2d-ba10-07eb1bb3bae9, 90cfd10b-88a1-4fc6-b017-a827c147417f 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: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f result, different first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f 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: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa result, different first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa 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: be86bce2-f67d-476d-8dd3-fd53b64f792f, ebba6da8-34c9-455b-bad8-ae387f4c8f43, de9a11c6-443d-497d-87b8-6d423849ab9b, ddf61f77-6a67-4fab-a5a5-98d5596129d3, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8 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: f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b, 05a98ac4-e3b1-4993-a3ad-778da095d874 result, different first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b, 05a98ac4-e3b1-4993-a3ad-778da095d874 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: 5a02666a-2448-4f7d-aa4f-238fc816de54, 2d3b6034-f98a-4950-858c-72303c6331ff, 26395b62-4c2e-4630-ba34-a146132e518f, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73 result, different first party: 5a02666a-2448-4f7d-aa4f-238fc816de54, 2d3b6034-f98a-4950-858c-72303c6331ff, 26395b62-4c2e-4630-ba34-a146132e518f, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73 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: 361f8100-d24b-440e-af0f-99cb212b370c, 30e6e6ab-d9c4-4900-ad29-691343587692, 7f158e36-e340-477f-80da-504fe003d765, 402299ce-b33d-4590-b905-64e905aefaa6, b21f453c-dccc-4365-b852-fb8d345a2149 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: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 result, different first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 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: 65d2e9a9-82af-4b62-af80-c5c4149a400c, 42cc2634-2bdc-4d28-8e02-99ed4c33492f, 995ddf97-bedc-4426-bffc-7941166d2b85, 8d10a1b1-ee1b-4b2d-ba10-07eb1bb3bae9, 90cfd10b-88a1-4fc6-b017-a827c147417f result, different first party: 65d2e9a9-82af-4b62-af80-c5c4149a400c, 42cc2634-2bdc-4d28-8e02-99ed4c33492f, 995ddf97-bedc-4426-bffc-7941166d2b85, 8d10a1b1-ee1b-4b2d-ba10-07eb1bb3bae9, 90cfd10b-88a1-4fc6-b017-a827c147417f 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: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f result, different first party: 91fd2fa1-bf07-4857-bdc6-9b076705538e, a13c184b-3371-40fe-9e90-dee502b98e17, b4c21ac9-140e-4e20-a223-e7187c8cf254, a8c23ee4-7242-47a6-a994-49faa048917b, 8e33e10d-8300-45d1-8f84-7be596c2368f 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: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa result, different first party: a6bfaee2-2560-4c2f-af22-fa620e28d40f, a36f35b8-5681-46e7-a292-1c07a2ba5f9a, 9139e6ae-871c-45d2-a1e7-fed5003fa0b2, 11cd412a-d0db-4d0f-9966-911a32edf674, 7a9bf2ae-4d50-4a27-8bb0-7efa00596daa 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: be86bce2-f67d-476d-8dd3-fd53b64f792f, ebba6da8-34c9-455b-bad8-ae387f4c8f43, de9a11c6-443d-497d-87b8-6d423849ab9b, ddf61f77-6a67-4fab-a5a5-98d5596129d3, 5a5e9872-139e-4b68-b9c2-59c0e2e8bdc8 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: f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b, 05a98ac4-e3b1-4993-a3ad-778da095d874 result, different first party: f752f4f2-f12c-4ff7-9940-8c711a2f3957, 86507250-23c0-4518-927a-cac1ce0175e0, 265a20ed-c7c7-4b0d-9014-a04e407e7479, eaa7c529-08f8-47a7-8d14-60288559ba9b, 05a98ac4-e3b1-4993-a3ad-778da095d874 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: 5a02666a-2448-4f7d-aa4f-238fc816de54, 2d3b6034-f98a-4950-858c-72303c6331ff, 26395b62-4c2e-4630-ba34-a146132e518f, 498c5b2a-2e3f-4fe5-8dae-cd29fe9d31e2, 5620f1b0-46f4-42f1-bfe1-782e8cba9d73 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: 361f8100-d24b-440e-af0f-99cb212b370c, 30e6e6ab-d9c4-4900-ad29-691343587692, 7f158e36-e340-477f-80da-504fe003d765, 402299ce-b33d-4590-b905-64e905aefaa6, b21f453c-dccc-4365-b852-fb8d345a2149 result, different first party: 361f8100-d24b-440e-af0f-99cb212b370c, 30e6e6ab-d9c4-4900-ad29-691343587692, 7f158e36-e340-477f-80da-504fe003d765, 402299ce-b33d-4590-b905-64e905aefaa6, b21f453c-dccc-4365-b852-fb8d345a2149 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: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 result, different first party: a2b914a7-a51f-4c87-b412-8ce3dc9a2ec8, 4028e9e6-07eb-45f4-b160-3c8b13e76ba0, ab70ed35-5007-47e0-ac17-0e0d3e7472cd, 87f7186c-7a5e-4060-aecf-dd4ffdbc967f, d6e36026-877f-4ebb-875a-102ca4d20f54 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: 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: 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
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: 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
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: 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
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: 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
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
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: true,true,true,true,true
  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: false,false,false,false,false readSameFirstParty: 2a0b:f4c2:2::46,2a0b:f4c0:16c:3::1,2a0b:f4c2:2::44,2a0b:f4c2:2::32,2a0b:f4c2:2::49 readDifferentFirstParty: 192.42.116.17,2a0b:f4c0:16c:3::1,2a0b:f4c0:16c:14::1,2a0b:f4c2::5,2605:6400:10:c3d:feb1:fe52:1adb:55dc passed: true,false,true,true,true 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: true,true,true,true,true passed: true,true,true,true,true
  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: 1296,1296,1296,1296,1296 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1292,1292,1292,1292,1292 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: 983,983,983,983,983 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1310,1310,1310,1310,1310 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: 1278,1278,1278,1278,1278 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: 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: 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: 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: 1405,1405,1405,1405,1405 passed: false,false,false,false,false
outerHeightHeight of the browser window in pixels, including browser chrome.
  expression: outerHeight desired expression: innerHeight actual value: 1371,1371,1371,1371,1371 desired value: 1296,1296,1296,1296,1296 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1371,1371,1371,1371,1371 desired value: 1292,1292,1292,1292,1292 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: 1068,1068,1068,1068,1068 desired value: 983,983,983,983,983 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1415,1415,1415,1415,1415 desired value: 1310,1310,1310,1310,1310 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: 1278,1278,1278,1278,1278 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: 1296,1296,1296,1296,1296 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1292,1292,1292,1292,1292 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: 983,983,983,983,983 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1310,1310,1310,1310,1310 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: 1278,1278,1278,1278,1278 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: 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: 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: 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: 1405,1405,1405,1405,1405 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: 429,429,429,429,429 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 22,22,22,22,22 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 3833,3833,3833,3833,3833 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: 3840,3840,3840,3840,3840 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 1195,351,2911,3671,3671 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: 836,836,836,836,836 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: 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: 47,47,47,47,47 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: 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: 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: 331,234,234,326,326 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: 68,68,68,68,68 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: 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
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: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
__hsscHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
__hstcHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
__sDrip.com email address tracking parameter
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
_hsencHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
_openstatYandex tracking parameter
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
dclidDoubleClick Click ID (Google)
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
fbclidFacebook Click Identifier
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
gclidGoogle Click Identifier
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
hsCtaTrackingHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
igshidInstagram tracking parameter
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
mc_eidMailchimp Email ID (email recipient's address)
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
mkt_tokAdobe Marketo tracking parameter
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
ml_subscriberMailerLite email tracking
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
ml_subscriber_hashMailerLite email tracking
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
msclkidMicrosoft Click ID
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
oly_anon_idOmeda marketing 'anonymous' customer id
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
oly_enc_idOmeda marketing 'known' customer id
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
rb_clickidUnknown high-entropy tracking parameter
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
s_cidAdobe Site Catalyst tracking parameter
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
vero_convVero tracking parameter
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
vero_idVero tracking parameter
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
wickedidWicked Reports e-commerce tracking
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
yclidYandex Click ID
  passed: true,true,true,true,true
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 passed: false,false,false,false,false
  value: 5035132803439002 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 listed 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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