Android Browsers
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brave
1.35

bromite
98.0

chrome
99.0

duckduckgo
5.115

edge
99.0

firefox
98.1

opera
67.1

samsung
16.2

tor
11.0

vivaldi
5.1

yandex
22.1
State Partitioning testsA common vulnerability of web browsers is that they allow tracking companies to 'tag' your browser with some data ('state') that identifies you. When third-party trackers are embedded in websites, they can see this identifying data as you browse to different websites. Fortunately, it is possible for this category of leaks to be fixed by partitioning all data stored in the browser such that no data can be shared between websites.
Alt-SvcAlt-Svc allows the server to indicate to the web browser that a resource should be loaded on a different server. Because this is a persistent setting, it could be used to track users across websites if it is not correctly partitioned.
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h2, h2, h2, h2, h2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h2, h2, h2, h2, h2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: 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, true, true, true, true passed: true test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h2, h2, h2, h2, h2 result, different first party: h2, h2, h2, h2, h2 unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h2, h2, h2, h2, h2 result, different first party: h2, h2, h2, h2, h2 unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3 result, different first party: h3, h3, h3 unsupported: false, false, false passed: false, false, false test failed: 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e, 79ee6b47-1671-410d-89e5-272dfe8f82a7, a9f61e2e-134d-4706-a669-d4ab500ef933, 90fd279e-0bb3-44cf-85b7-6aee552902a0, fece7d84-b460-461f-94af-e00d0faea51b result, different first party: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e, 79ee6b47-1671-410d-89e5-272dfe8f82a7, a9f61e2e-134d-4706-a669-d4ab500ef933, 90fd279e-0bb3-44cf-85b7-6aee552902a0, fece7d84-b460-461f-94af-e00d0faea51b unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 5dd35ccc-732f-48ce-8885-7e736ada28c7, 472634ce-a168-4298-8334-77a464eb5f5b, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec, 7e99a54f-0dda-464f-b694-4d194704db03, d85388c0-e0c1-43af-aae4-4eeca7ad291c result, different first party: 5dd35ccc-732f-48ce-8885-7e736ada28c7, 472634ce-a168-4298-8334-77a464eb5f5b, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec, 7e99a54f-0dda-464f-b694-4d194704db03, d85388c0-e0c1-43af-aae4-4eeca7ad291c 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 result, different first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 result, different first party: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef result, different first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 result, different first party: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e result, different first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b result, different first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: fbf0cbcd-343d-4015-88ec-da52314bacf1, 59f9f586-47d6-49c9-a1fb-62759eac8e8f, 9d5a70af-7656-4718-8a8d-49774db04eb6, 3d89230e-eb92-4e87-b77c-a4d7ff16cced, 6173dbb7-a73f-429b-b98c-a31f1cc55bdf result, different first party: Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 result, different first party: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 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: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 result, different first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 unsupported: false, false, false passed: false, false, false test failed: 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: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e, 79ee6b47-1671-410d-89e5-272dfe8f82a7, a9f61e2e-134d-4706-a669-d4ab500ef933, 90fd279e-0bb3-44cf-85b7-6aee552902a0, fece7d84-b460-461f-94af-e00d0faea51b 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: 5dd35ccc-732f-48ce-8885-7e736ada28c7, 472634ce-a168-4298-8334-77a464eb5f5b, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec, 7e99a54f-0dda-464f-b694-4d194704db03, d85388c0-e0c1-43af-aae4-4eeca7ad291c result, different first party: 5dd35ccc-732f-48ce-8885-7e736ada28c7, 472634ce-a168-4298-8334-77a464eb5f5b, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec, 7e99a54f-0dda-464f-b694-4d194704db03, d85388c0-e0c1-43af-aae4-4eeca7ad291c 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: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 result, different first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 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: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 result, different first party: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 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: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef result, different first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef 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: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 result, different first party: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 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: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e result, different first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e 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: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b result, different first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b 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: fbf0cbcd-343d-4015-88ec-da52314bacf1, 59f9f586-47d6-49c9-a1fb-62759eac8e8f, 9d5a70af-7656-4718-8a8d-49774db04eb6, 3d89230e-eb92-4e87-b77c-a4d7ff16cced, 6173dbb7-a73f-429b-b98c-a31f1cc55bdf 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: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 result, different first party: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 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: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 result, different first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 unsupported: false, false, false passed: false, false, false test failed: 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: db4a4976-3f4b-4464-b035-3cb96987017f, db4a4976-3f4b-4464-b035-3cb96987017f, db4a4976-3f4b-4464-b035-3cb96987017f, db4a4976-3f4b-4464-b035-3cb96987017f, db4a4976-3f4b-4464-b035-3cb96987017f 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: cfc23bc0-1b50-454a-bd4b-4faa79e27282, cfc23bc0-1b50-454a-bd4b-4faa79e27282, cfc23bc0-1b50-454a-bd4b-4faa79e27282, cfc23bc0-1b50-454a-bd4b-4faa79e27282, cfc23bc0-1b50-454a-bd4b-4faa79e27282 result, different first party: Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: fb760fe6-3247-43d9-a7e5-dae8b1914e2b, fb760fe6-3247-43d9-a7e5-dae8b1914e2b, fb760fe6-3247-43d9-a7e5-dae8b1914e2b, fb760fe6-3247-43d9-a7e5-dae8b1914e2b, fb760fe6-3247-43d9-a7e5-dae8b1914e2b result, different first party: fb760fe6-3247-43d9-a7e5-dae8b1914e2b, fb760fe6-3247-43d9-a7e5-dae8b1914e2b, fb760fe6-3247-43d9-a7e5-dae8b1914e2b, fb760fe6-3247-43d9-a7e5-dae8b1914e2b, fb760fe6-3247-43d9-a7e5-dae8b1914e2b 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 8431696f-e29e-42c3-8dde-cdd4f3269edc, 8431696f-e29e-42c3-8dde-cdd4f3269edc, 8431696f-e29e-42c3-8dde-cdd4f3269edc, 8431696f-e29e-42c3-8dde-cdd4f3269edc, 8431696f-e29e-42c3-8dde-cdd4f3269edc result, different first party: 8431696f-e29e-42c3-8dde-cdd4f3269edc, 8431696f-e29e-42c3-8dde-cdd4f3269edc, 8431696f-e29e-42c3-8dde-cdd4f3269edc, 8431696f-e29e-42c3-8dde-cdd4f3269edc, 8431696f-e29e-42c3-8dde-cdd4f3269edc unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 73ff56ac-8f2c-4879-861c-16d226e63916, 73ff56ac-8f2c-4879-861c-16d226e63916, 73ff56ac-8f2c-4879-861c-16d226e63916, 73ff56ac-8f2c-4879-861c-16d226e63916, 73ff56ac-8f2c-4879-861c-16d226e63916 result, different first party: 73ff56ac-8f2c-4879-861c-16d226e63916, 73ff56ac-8f2c-4879-861c-16d226e63916, 73ff56ac-8f2c-4879-861c-16d226e63916, 73ff56ac-8f2c-4879-861c-16d226e63916, 73ff56ac-8f2c-4879-861c-16d226e63916 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a result, different first party: dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 6cb5d9ac-b62f-41d9-a41e-5ee36aeaee14, 6cb5d9ac-b62f-41d9-a41e-5ee36aeaee14, 6cb5d9ac-b62f-41d9-a41e-5ee36aeaee14, 6cb5d9ac-b62f-41d9-a41e-5ee36aeaee14, 6cb5d9ac-b62f-41d9-a41e-5ee36aeaee14 result, different first party: 6cb5d9ac-b62f-41d9-a41e-5ee36aeaee14, 6cb5d9ac-b62f-41d9-a41e-5ee36aeaee14, 6cb5d9ac-b62f-41d9-a41e-5ee36aeaee14, 6cb5d9ac-b62f-41d9-a41e-5ee36aeaee14, 6cb5d9ac-b62f-41d9-a41e-5ee36aeaee14 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8 result, different first party: ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e result, different first party: 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: fc6672b5-c2e0-40e1-bac8-008f561e753b, fc6672b5-c2e0-40e1-bac8-008f561e753b, fc6672b5-c2e0-40e1-bac8-008f561e753b result, different first party: fc6672b5-c2e0-40e1-bac8-008f561e753b, fc6672b5-c2e0-40e1-bac8-008f561e753b, fc6672b5-c2e0-40e1-bac8-008f561e753b unsupported: false, false, false passed: false, false, false test failed: 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(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e_http, 79ee6b47-1671-410d-89e5-272dfe8f82a7_http, a9f61e2e-134d-4706-a669-d4ab500ef933_http, 90fd279e-0bb3-44cf-85b7-6aee552902a0_http, fece7d84-b460-461f-94af-e00d0faea51b_http result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${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=([\w-]+)/)[1]: null; } result, same first party: 5dd35ccc-732f-48ce-8885-7e736ada28c7_http, 472634ce-a168-4298-8334-77a464eb5f5b_http, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec_http, 7e99a54f-0dda-464f-b694-4d194704db03_http, d85388c0-e0c1-43af-aae4-4eeca7ad291c_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(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1_http, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57_http, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4_http, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2_http, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62_http result, different first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1_http, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57_http, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4_http, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2_http, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${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=([\w-]+)/)[1]: null; } result, same first party: edc74ee3-94ac-4f91-84ca-45603d90f048_http, 3ee3682c-64e9-49ee-9677-6f9c54840dc6_http, 24c228a2-aa8f-43f5-be24-2ccaca43befd_http, 3db9a558-b466-4b8a-b419-7ac94a1474ef_http, 4f17e379-aacc-4874-a52d-1b060029d491_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(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce_http, 347af39e-1e3e-45ba-a75b-2f3a555225a1_http, 503f270f-8597-4da0-9e34-a425d9ebf9bb_http, 4fb443a4-1525-432e-bf18-ed3ef9a50bec_http, 2d7033ad-dd28-493d-bf25-fbc8dad771ef_http result, different first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce_http, 347af39e-1e3e-45ba-a75b-2f3a555225a1_http, 503f270f-8597-4da0-9e34-a425d9ebf9bb_http, 4fb443a4-1525-432e-bf18-ed3ef9a50bec_http, 2d7033ad-dd28-493d-bf25-fbc8dad771ef_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${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=([\w-]+)/)[1]: null; } result, same first party: ef594855-81a5-447d-877d-d1bff5f6ed35_http, b316406a-8416-48a2-baa5-b22a965399fa_http, 870c62ad-b1f1-4593-a46d-c84e444d3644_http, e8438eaf-6786-4b0c-8575-b631fabbc1a3_http, 493511ba-419e-4d2a-af2a-42b5be171be7_http result, different first party: ef594855-81a5-447d-877d-d1bff5f6ed35_http, b316406a-8416-48a2-baa5-b22a965399fa_http, 870c62ad-b1f1-4593-a46d-c84e444d3644_http, e8438eaf-6786-4b0c-8575-b631fabbc1a3_http, 493511ba-419e-4d2a-af2a-42b5be171be7_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(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1_http, 345e62c1-6d68-4f7d-985e-8c5c0e74803e_http, 227f79a5-c50d-4a23-9751-85880dbd6cbe_http, 194240f0-c09d-4bea-86dd-df6bded3344c_http, d631b088-09ec-4d27-9f85-60c18a6ba80e_http result, different first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1_http, 345e62c1-6d68-4f7d-985e-8c5c0e74803e_http, 227f79a5-c50d-4a23-9751-85880dbd6cbe_http, 194240f0-c09d-4bea-86dd-df6bded3344c_http, d631b088-09ec-4d27-9f85-60c18a6ba80e_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${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=([\w-]+)/)[1]: null; } result, same first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd_http, e2e1327c-22ef-4412-b72d-0d3926b4e2a3_http, 948282db-07fd-473e-a766-8256139a3965_http, 1770c51d-3964-4d14-8eda-2b8bd540840c_http, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b_http result, different first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd_http, e2e1327c-22ef-4412-b72d-0d3926b4e2a3_http, 948282db-07fd-473e-a766-8256139a3965_http, 1770c51d-3964-4d14-8eda-2b8bd540840c_http, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b_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(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: fbf0cbcd-343d-4015-88ec-da52314bacf1_http, 59f9f586-47d6-49c9-a1fb-62759eac8e8f_http, 9d5a70af-7656-4718-8a8d-49774db04eb6_http, 3d89230e-eb92-4e87-b77c-a4d7ff16cced_http, 6173dbb7-a73f-429b-b98c-a31f1cc55bdf_http result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${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=([\w-]+)/)[1]: null; } result, same first party: 40075437-5e63-422a-aced-933e10ddecc4_http, ac8330f3-c185-4a12-b504-2c696cedca73_http, 17563517-d3e6-4aec-9443-92c093499749_http, 96bdf699-6c33-471c-9ef1-2bb39886a6fa_http, 0cce88dc-2e73-4039-8441-2fb069bb7b79_http result, different first party: 40075437-5e63-422a-aced-933e10ddecc4_http, ac8330f3-c185-4a12-b504-2c696cedca73_http, 17563517-d3e6-4aec-9443-92c093499749_http, 96bdf699-6c33-471c-9ef1-2bb39886a6fa_http, 0cce88dc-2e73-4039-8441-2fb069bb7b79_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(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc_http, 1fc43e52-b452-4505-a092-20b295a55bd7_http, 449cb234-16d8-490e-bec6-9390720ffd17_http result, different first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc_http, 1fc43e52-b452-4505-a092-20b295a55bd7_http, 449cb234-16d8-490e-bec6-9390720ffd17_http unsupported: false, false, false passed: false, false, false test failed: false, false, false
cookie (JS)The cookie, first introduced by Netscape in 1994, is a small amount of data stored by your browser on a website's behalf. It has legitimate uses, but it is also the classic cross-site tracking mechanism, and today still the most popular method of tracking users across websites. Browsers can stop cookies from being used for cross-site tracking by either blocking or partitioning them.
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e_js, 79ee6b47-1671-410d-89e5-272dfe8f82a7_js, a9f61e2e-134d-4706-a669-d4ab500ef933_js, 90fd279e-0bb3-44cf-85b7-6aee552902a0_js, fece7d84-b460-461f-94af-e00d0faea51b_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=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 5dd35ccc-732f-48ce-8885-7e736ada28c7_js, 472634ce-a168-4298-8334-77a464eb5f5b_js, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec_js, 7e99a54f-0dda-464f-b694-4d194704db03_js, d85388c0-e0c1-43af-aae4-4eeca7ad291c_js result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1_js, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57_js, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4_js, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2_js, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62_js result, different first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1_js, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57_js, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4_js, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2_js, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62_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=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: edc74ee3-94ac-4f91-84ca-45603d90f048_js, 3ee3682c-64e9-49ee-9677-6f9c54840dc6_js, 24c228a2-aa8f-43f5-be24-2ccaca43befd_js, 3db9a558-b466-4b8a-b419-7ac94a1474ef_js, 4f17e379-aacc-4874-a52d-1b060029d491_js result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce_js, 347af39e-1e3e-45ba-a75b-2f3a555225a1_js, 503f270f-8597-4da0-9e34-a425d9ebf9bb_js, 4fb443a4-1525-432e-bf18-ed3ef9a50bec_js, 2d7033ad-dd28-493d-bf25-fbc8dad771ef_js result, different first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce_js, 347af39e-1e3e-45ba-a75b-2f3a555225a1_js, 503f270f-8597-4da0-9e34-a425d9ebf9bb_js, 4fb443a4-1525-432e-bf18-ed3ef9a50bec_js, 2d7033ad-dd28-493d-bf25-fbc8dad771ef_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=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: ef594855-81a5-447d-877d-d1bff5f6ed35_js, b316406a-8416-48a2-baa5-b22a965399fa_js, 870c62ad-b1f1-4593-a46d-c84e444d3644_js, e8438eaf-6786-4b0c-8575-b631fabbc1a3_js, 493511ba-419e-4d2a-af2a-42b5be171be7_js result, different first party: ef594855-81a5-447d-877d-d1bff5f6ed35_js, b316406a-8416-48a2-baa5-b22a965399fa_js, 870c62ad-b1f1-4593-a46d-c84e444d3644_js, e8438eaf-6786-4b0c-8575-b631fabbc1a3_js, 493511ba-419e-4d2a-af2a-42b5be171be7_js unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1_js, 345e62c1-6d68-4f7d-985e-8c5c0e74803e_js, 227f79a5-c50d-4a23-9751-85880dbd6cbe_js, 194240f0-c09d-4bea-86dd-df6bded3344c_js, d631b088-09ec-4d27-9f85-60c18a6ba80e_js result, different first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1_js, 345e62c1-6d68-4f7d-985e-8c5c0e74803e_js, 227f79a5-c50d-4a23-9751-85880dbd6cbe_js, 194240f0-c09d-4bea-86dd-df6bded3344c_js, d631b088-09ec-4d27-9f85-60c18a6ba80e_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=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd_js, e2e1327c-22ef-4412-b72d-0d3926b4e2a3_js, 948282db-07fd-473e-a766-8256139a3965_js, 1770c51d-3964-4d14-8eda-2b8bd540840c_js, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b_js result, different first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd_js, e2e1327c-22ef-4412-b72d-0d3926b4e2a3_js, 948282db-07fd-473e-a766-8256139a3965_js, 1770c51d-3964-4d14-8eda-2b8bd540840c_js, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b_js unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: fbf0cbcd-343d-4015-88ec-da52314bacf1_js, 59f9f586-47d6-49c9-a1fb-62759eac8e8f_js, 9d5a70af-7656-4718-8a8d-49774db04eb6_js, 3d89230e-eb92-4e87-b77c-a4d7ff16cced_js, 6173dbb7-a73f-429b-b98c-a31f1cc55bdf_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=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 40075437-5e63-422a-aced-933e10ddecc4_js, ac8330f3-c185-4a12-b504-2c696cedca73_js, 17563517-d3e6-4aec-9443-92c093499749_js, 96bdf699-6c33-471c-9ef1-2bb39886a6fa_js, 0cce88dc-2e73-4039-8441-2fb069bb7b79_js result, different first party: 40075437-5e63-422a-aced-933e10ddecc4_js, ac8330f3-c185-4a12-b504-2c696cedca73_js, 17563517-d3e6-4aec-9443-92c093499749_js, 96bdf699-6c33-471c-9ef1-2bb39886a6fa_js, 0cce88dc-2e73-4039-8441-2fb069bb7b79_js unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc_js, 1fc43e52-b452-4505-a092-20b295a55bd7_js, 449cb234-16d8-490e-bec6-9390720ffd17_js result, different first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc_js, 1fc43e52-b452-4505-a092-20b295a55bd7_js, 449cb234-16d8-490e-bec6-9390720ffd17_js unsupported: false, false, false passed: false, false, false test failed: 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_25415127902552115, fake_41171590176230555, fake_08173240678482041, fake_8773122988498907, fake_9989322589442651 result, different first party: fake_40163972183704577, fake_38524406271011347, fake_013729388797963704, fake_2369234411512411, fake_136023268945902 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_047540169677619204, fake_7026110831606769, fake_9523060846544036, fake_9194235700099243, fake_6837874454189721 result, different first party: fake_2970025824083484, fake_19036731842353838, fake_9481753342738741, fake_5700292028662546, fake_8881598551519143 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_3967886429410383, fake_19231905774938118, fake_23160735648559716, fake_271452547896756, fake_7358580696190011 result, different first party: fake_48094194785156863, fake_3466534701196733, fake_49181581944005814, fake_10494269536835166, fake_7176833232060518 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_44760660883201564, fake_7709555697311623, fake_24615377596765664, fake_7412759399058517, fake_8584621367112986 result, different first party: fake_44760660883201564, fake_7709555697311623, fake_24615377596765664, fake_7412759399058517, fake_8584621367112986 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_7556244815037343, fake_4654385261606626, fake_10530418074905312, fake_9463350286305552, fake_6688867764028033 result, different first party: fake_9306983649052569, fake_07779688134717189, fake_4969103886592843, fake_6867557925761147, fake_721167532926291 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_2078067451703849, fake_4241475497961775, fake_4235222470252207, fake_5641672237795978, fake_38214999202978484 result, different first party: fake_8676836718042082, fake_1130698538728967, fake_32732071137186436, fake_544166241263287, fake_3990930973967306 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_39394240780215006, fake_4664054680711167, fake_342924269132445, fake_9428585553260271, fake_6827765742144598 result, different first party: fake_39394240780215006, fake_4664054680711167, fake_342924269132445, fake_9428585553260271, fake_6827765742144598 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_2485607726442749, fake_13492110370493138, fake_4415365961087472, fake_5500181761152501, fake_5225473009061354 result, different first party: fake_2485607726442749, fake_13492110370493138, fake_4415365961087472, fake_5500181761152501, fake_5225473009061354 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_9668457965183432, fake_8508390135757777, fake_047187339543161455, fake_5283158734955047, fake_76401227116188 result, different first party: fake_044851123765573764, fake_8038810178651261, fake_2827848837399265, fake_21717309614884717, fake_5660431854897177 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_16891115375746835, fake_8086521974549228, fake_621602950208815, fake_13158803505463856, fake_03432751807952594 result, different first party: fake_16891115375746835, fake_8086521974549228, fake_621602950208815, fake_13158803505463856, fake_03432751807952594 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_8698313952861536, fake_6569183711155226, fake_48830116332099127 result, different first party: fake_8698313952861536, fake_6569183711155226, fake_48830116332099127 unsupported: false, false, false passed: false, false, false test failed: 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: 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: 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: 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: (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: 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 result, different first party: 2, 2, 2 unsupported: false, false, false passed: true, true, true test failed: 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: 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 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: 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 response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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 result, different first party: 2, 2, 2 unsupported: false, false, false passed: true, true, true test failed: false, false, false
font cacheWeb fonts are sometimes stored in their own cache, which is vulnerable to being abused for cross-site tracking.
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 1, 2, 2, 2 unsupported: false, false, false, false, false passed: true, false, 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: 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: 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: 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 result, different first party: 1, 1, 1 unsupported: false, false, false passed: false, false, false test failed: 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e, 79ee6b47-1671-410d-89e5-272dfe8f82a7, a9f61e2e-134d-4706-a669-d4ab500ef933, 90fd279e-0bb3-44cf-85b7-6aee552902a0, fece7d84-b460-461f-94af-e00d0faea51b result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: 5dd35ccc-732f-48ce-8885-7e736ada28c7, 472634ce-a168-4298-8334-77a464eb5f5b, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec, 7e99a54f-0dda-464f-b694-4d194704db03, d85388c0-e0c1-43af-aae4-4eeca7ad291c 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 result, different first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 result, different first party: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef result, different first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e result, different first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b result, different first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: fbf0cbcd-343d-4015-88ec-da52314bacf1, 59f9f586-47d6-49c9-a1fb-62759eac8e8f, 9d5a70af-7656-4718-8a8d-49774db04eb6, 3d89230e-eb92-4e87-b77c-a4d7ff16cced, 6173dbb7-a73f-429b-b98c-a31f1cc55bdf result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 result, different first party: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 result, different first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 unsupported: false, false, false passed: false, false, false test failed: false, false, false
H2 connectionHTTP/2 is a web connection protocol introduced in 2015. Some browsers re-use HTTP/2 connections across websites and can thus be used to track users.
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e, 79ee6b47-1671-410d-89e5-272dfe8f82a7, a9f61e2e-134d-4706-a669-d4ab500ef933, 90fd279e-0bb3-44cf-85b7-6aee552902a0, fece7d84-b460-461f-94af-e00d0faea51b 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 5dd35ccc-732f-48ce-8885-7e736ada28c7, 472634ce-a168-4298-8334-77a464eb5f5b, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec, 7e99a54f-0dda-464f-b694-4d194704db03, d85388c0-e0c1-43af-aae4-4eeca7ad291c result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 result, different first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 result, different first party: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef result, different first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e result, different first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b result, different first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: fbf0cbcd-343d-4015-88ec-da52314bacf1, 59f9f586-47d6-49c9-a1fb-62759eac8e8f, 9d5a70af-7656-4718-8a8d-49774db04eb6, 3d89230e-eb92-4e87-b77c-a4d7ff16cced, 6173dbb7-a73f-429b-b98c-a31f1cc55bdf 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 result, different first party: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 result, different first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 unsupported: false, false, false passed: false, false, false test failed: 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: 98c3588105d3e083222b4816f376dba0, 800e9d09988b17bb24850c3132a23fc4, e891bf89f9ddbca4a65a5c808881ff2d, 866d64b9cc843d16be2287ac8056031b, 876e9213bf8d2bd4c4278017d03a217b result, different first party: 5aabd31065c0ef80c8b4711b9a246402, 64a4b9065c9f493c0177bf0580db9e87, 53333d9e0c58375d0d525824e433d878, 325636e6fe5fc7285d00871ba6d338f4, d9496cb871ec92847d9056e36bb77890 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: 082673d860e4958de8c0df72ccb34272, 6c85d2d4f946fd1505cd3be0953931d5, 19e3c6485b5ff4f59ac34cc4fae06385, 04c073be5634dc339497ad7d27b8fe12, 32e83fd6be3087f15b7c7cc62e8d72c9 result, different first party: 94a959a2379e2623ddc12c7248b1e6cf, 40771a3fe932c66e073735ab5116e028, ba51f04e700bfb6504fbc0a496285f93, 7aa8b79158c5d3070f1c8f3e35814e8e, 23fcdf4e9a01db91de59687c613f251a 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: 94360fe449b3dc92d5092d68cfd76f4b, 50ad81defcf70c5e29ceb72ff1de9845, e0f3843f427b5ab8f0a053db3cd1170a, e1ddac8707affcf0b83d3a4382cc0520, eafea8687a5743e6e6640ea2c865ec0e result, different first party: 94360fe449b3dc92d5092d68cfd76f4b, 50ad81defcf70c5e29ceb72ff1de9845, e0f3843f427b5ab8f0a053db3cd1170a, e1ddac8707affcf0b83d3a4382cc0520, eafea8687a5743e6e6640ea2c865ec0e 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: 0483d27fc6af17d653b6826b1ff759b9, c09816d019b850f2db0f410c9bbad331, d2e1ef9c4fb4df4e53aa9ec5a09b0d7c, 55b30b3e0060af98940924498a1dd165, a97071409ae1d96efca5309a419b20fa result, different first party: 0483d27fc6af17d653b6826b1ff759b9, c09816d019b850f2db0f410c9bbad331, d2e1ef9c4fb4df4e53aa9ec5a09b0d7c, 55b30b3e0060af98940924498a1dd165, a97071409ae1d96efca5309a419b20fa 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: 6d8f0daa4a44142a53e42ba14b12acc1, 41ccede66182f8d457a37568e64ae1b6, 991575154ff16d3d321276e8cd0b4393, 0750bd141d27869ad968ee1f7b0da3e5, 733db92949a4f66ca45fdc0ee23340fb result, different first party: 6d8f0daa4a44142a53e42ba14b12acc1, 41ccede66182f8d457a37568e64ae1b6, 991575154ff16d3d321276e8cd0b4393, 0750bd141d27869ad968ee1f7b0da3e5, 733db92949a4f66ca45fdc0ee23340fb 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: d096a13c56659cdc07635fdf6363b46e, a2ec889a0dcb49a799b0249e069e42c1, aa7d63db9cff54a1123c1b2aa781a56b, 93ebca6f29ccc656b2bebdaf49702b37, 90bbd8db242a62defcd552877e127408 result, different first party: 4a6934f848fdaa0721684c16b77ea425, 822b385a3d8ed3302d7abc945a67cf3e, 1fa7ce9a9fa6d95e9895c8105e40bc46, 5d21ac68269571a3f7972be5b1f2b5b0, 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: 8eea7dbb3c0d04d6b5db3dd2defaf1a4, dfea9b9d4fb64a0d4d892ff47c196f55, 45235f940fecbb5a00a658d8b68c9d9f, 0fbc913cb620e18aeeb68398bb8b7c3c, 2bcff1651826c5e8add851e1866ec172 result, different first party: 8eea7dbb3c0d04d6b5db3dd2defaf1a4, dfea9b9d4fb64a0d4d892ff47c196f55, 45235f940fecbb5a00a658d8b68c9d9f, 0fbc913cb620e18aeeb68398bb8b7c3c, 2bcff1651826c5e8add851e1866ec172 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: c90015a25fa98370b400f7514402dc01, 889a04e62d98dce33887aeec4ba2e29e, bdabf880f6635e0eae1ad4914198b9d1, 6c83c0742a159fbf001267c43b7535b4, 1db422468857b7532f4bbc6d6a341fdb result, different first party: c90015a25fa98370b400f7514402dc01, 889a04e62d98dce33887aeec4ba2e29e, bdabf880f6635e0eae1ad4914198b9d1, 6c83c0742a159fbf001267c43b7535b4, 1db422468857b7532f4bbc6d6a341fdb 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: da96e03b455e7f5b8f0d0bdd294ce964, 9da2539e33fe82a564e17de417a16fe4, 1d521280005c4db93ff0c0a812ea6862 result, different first party: da96e03b455e7f5b8f0d0bdd294ce964, 9da2539e33fe82a564e17de417a16fe4, 1d521280005c4db93ff0c0a812ea6862 unsupported: false, false, false passed: false, false, false test failed: 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: null read: null result, same first party: , , , , result, different first party: HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected unsupported: , , , , passed: true, true, true, true, true test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: 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: 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 result, different first party: Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false passed: false, false, false test failed: 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: 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 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: 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 iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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 result, different first party: 2, 2, 2 unsupported: false, false, false passed: true, true, true test failed: false, false, false
image cacheCaching of images in web browsers is a standard behavior. But if that cache leaks between websites, it can be abused for cross-site tracking.
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 1, 2, 2, 2 unsupported: false, false, false, false, false passed: true, false, 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: 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: 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: 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 result, different first party: 1, 1, 1 unsupported: false, false, false passed: false, false, false test failed: 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: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e, 79ee6b47-1671-410d-89e5-272dfe8f82a7, a9f61e2e-134d-4706-a669-d4ab500ef933, 90fd279e-0bb3-44cf-85b7-6aee552902a0, fece7d84-b460-461f-94af-e00d0faea51b 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: 5dd35ccc-732f-48ce-8885-7e736ada28c7, 472634ce-a168-4298-8334-77a464eb5f5b, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec, 7e99a54f-0dda-464f-b694-4d194704db03, d85388c0-e0c1-43af-aae4-4eeca7ad291c 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: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 result, different first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 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: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 result, different first party: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 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: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef result, different first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef 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: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 result, different first party: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 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: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e result, different first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e 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: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b result, different first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b 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: 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: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 result, different first party: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 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: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 result, different first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 unsupported: false, false, false passed: false, false, false test failed: 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: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e, 79ee6b47-1671-410d-89e5-272dfe8f82a7, a9f61e2e-134d-4706-a669-d4ab500ef933, 90fd279e-0bb3-44cf-85b7-6aee552902a0, fece7d84-b460-461f-94af-e00d0faea51b 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: 5dd35ccc-732f-48ce-8885-7e736ada28c7, 472634ce-a168-4298-8334-77a464eb5f5b, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec, 7e99a54f-0dda-464f-b694-4d194704db03, d85388c0-e0c1-43af-aae4-4eeca7ad291c result, different first party: Error: Failed to read the 'localStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'localStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'localStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'localStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'localStorage' property from 'Window': Access is denied for this document. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 result, different first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 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: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 result, different first party: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 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: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef result, different first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef 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: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 result, different first party: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 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: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e result, different first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e 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: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b result, different first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b 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: fbf0cbcd-343d-4015-88ec-da52314bacf1, 59f9f586-47d6-49c9-a1fb-62759eac8e8f, 9d5a70af-7656-4718-8a8d-49774db04eb6, 3d89230e-eb92-4e87-b77c-a4d7ff16cced, 6173dbb7-a73f-429b-b98c-a31f1cc55bdf 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: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 result, different first party: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 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: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 result, different first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 unsupported: false, false, false passed: false, false, false test failed: 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: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e, 79ee6b47-1671-410d-89e5-272dfe8f82a7, a9f61e2e-134d-4706-a669-d4ab500ef933, 90fd279e-0bb3-44cf-85b7-6aee552902a0, fece7d84-b460-461f-94af-e00d0faea51b 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: 5dd35ccc-732f-48ce-8885-7e736ada28c7, 472634ce-a168-4298-8334-77a464eb5f5b, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec, 7e99a54f-0dda-464f-b694-4d194704db03, d85388c0-e0c1-43af-aae4-4eeca7ad291c 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: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 result, different first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 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: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 result, different first party: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 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: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef result, different first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef 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: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 result, different first party: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 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: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e result, different first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e 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: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b result, different first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: async (key) => { if (navigator.locks) { navigator.locks.request(key, lock => new Promise((f,r) => {})); let queryResult = await navigator.locks.query(); return queryResult.held[0].clientId; } else { throw new Error("Unsupported"); } } read: async () => { if (navigator.locks) { let queryResult = await navigator.locks.query(); return queryResult.held[0].name; } } result, same first party: undefined result, different first party: undefined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { if (navigator.locks) { navigator.locks.request(key, lock => new Promise((f,r) => {})); let queryResult = await navigator.locks.query(); return queryResult.held[0].clientId; } else { throw new Error("Unsupported"); } } read: async () => { if (navigator.locks) { let queryResult = await navigator.locks.query(); return queryResult.held[0].name; } } result, same first party: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 result, different first party: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 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: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 result, different first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 unsupported: false, false, false passed: false, false, false test failed: false, false, false
prefetch cacheA suggests to browsers they should fetch a resource ahead of time and cache it. But if browsers don't partition this cache, it can be used to track users across websites.
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 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: 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: 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: 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 result, different first party: 1, 1, 1 unsupported: false, false, false passed: false, false, false test failed: 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: 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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: , , , , result, different first party: , , , , unsupported: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 result, different first party: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: , , , , result, different first party: , , , , unsupported: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined result, different first party: Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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
  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: , , 449cb234-16d8-490e-bec6-9390720ffd17 result, different first party: , , 449cb234-16d8-490e-bec6-9390720ffd17 unsupported: false, false, false passed: , false test failed: true, true, false
SharedWorkerThe SharedWorker API allows scripts from multiple tabs to share a background thread of computation. If SharedWorker is not partitioned, then it can be abused to shared data between websites in your browser.
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  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: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 result, different first party: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 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: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  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: fbf0cbcd-343d-4015-88ec-da52314bacf1, 59f9f586-47d6-49c9-a1fb-62759eac8e8f, 9d5a70af-7656-4718-8a8d-49774db04eb6, 3d89230e-eb92-4e87-b77c-a4d7ff16cced, 6173dbb7-a73f-429b-b98c-a31f1cc55bdf 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: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true passed: undefined test failed: 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: f4e568b81640432def3c709ee634c62b6ab140714e3eb1d6f5e9196b0fd517c4, 71500a9265d74f31fd75feba81ba03b71588ede038262e1e12e5dc181a33c074, 8025446303c1f9aca90d204f8ce1b5e644d5c75f819b7b5354808cd3d2062042, 383c79bd98e766f4aeea75f470e6e35270f340e0314ca7083b3d51fa5718b375, f5447ef41f4723ed9271fe6d856e486c2fa68371b0cde1cf30a151588e644957 result, different first party: e2d683d2322e2115d4036c4a92a8b8a69f87c8bb08025af18c0b672e2b7f64e7, aacb22a41878cd3f94b1980d7298ae9ebe20849dc93c11f6aabf1a114342fb0e, a06b977333cbfc7bf0af421f61a75eb79dc8cc58b7dddcdc2d2583d087911cf3, f9c1a6c115e91ab43d2e5ebb238dd9a580ce1b4079d511a2ca3edb38ba68948e, b045de181e703069c99b26f07cd0a702adbb414fcb898ce31575a83076713d59 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: 943dd811e2507cd7b89efda2ce49d1e075d74c6097733e728e7507c57d0f6245, 5f0865936c0229ba6319ab71d650f187ba292e388bf9e69bcd258285b35e1173, c166cb2b1f1ab871eb4c33252f6a363dea6a9fa6138138577adc4277a1f26a05, 7de8e152a01c4d06dacbb286daafb8f7600bb3c8e436021e31dc6ea61c4a7d84, 77d8c31536b8928e2b37d799df02847a7c3b3fa6340e937a55d7189230d2691b result, different first party: 00afb8682f95f20bafedbd363f59b83b3bf55376611ea420cbabe8555b59aa98, 17edb6429dc1965a90b23b6f82c341f041806d64307fb386e86b457d4a1043dd, ca7125e1206708aefeef2ca759f09b96bafc416c203378e49674f4455ec047c9, 7999c0a4ec727e34149c4cdf07946dfcb84926088b81e2de7418e3cfe69af281, 337e741a978df006b22c1f75c23eebeb8b245eaeda79e9ac8a4c8ed7588392c7 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: 9e0427499855fbcf3cab15e6107b1ad63853db9cae647b9fa81e72cc2bdf9d97, 1bef1ca691c3fbed15a46717688614495f8f2a9249eecf07f63f644382dfc0fd, 492f2d83f7f36da88a2e2c20e3d843e90908a14609e56570926c30a0883f3b51, 2dfd2c3d77b087eb0ee241cf9d197f1120a733aeb64b7c601915852a8634183b, 7b5ff2aab79de7c25652fd2a9bd482521fce1800e3dca8ac868f4d7be351fd86 result, different first party: 3f77d7cbdc0de6551013acb8d9137dd7b9e6f919259d68bf274d0390b201b41c, ad3c70aaa009e2d288ac6a95a0a6ee4cbdcfd45553a812968b67ebe7dda4786b, daf88c25bf93505ca6d036687f85de5073ae8606ae24924ecdc2ae0618f2ef07, 07c3ccb1fb8d01d9256440edc6b0f69f0b20ecc86c972cb0f6efe475418db1f0, 9e56179cf0a2d9259d37acad72b7aac4f3c19c004f7e7e84684784bce0ff91f2 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: 43ff19a4330dee4f5fbc780bd5fb8157512df118dee904e114a8e3de5f5bcee7, f408455b113fb80f60fb69a6a9a4c9c59861161a3c02e1c3b5a47a5351d4d03a, 2f282f4df739bae750abbd49cc32fdddcaab4192a35e73f341e3ad1a91a6a1a1, f4ac5586bf4d8a78ae33a45e3f8c4fe9807f44cdad9ccea92a11ef40413491cc, 7de9c2a4009e1183f3854c17c0960a09c3e2cc5a1028586be06e38e807ab51ec result, different first party: 34d5afb4502528689e6541d0202c655b5f6e58bbe66d51bda4733e82bdfbe143, f5ddc2cf9ce2f89ace12b9032bff3a5540840e3f314c73426a5f7d1ffda57c73, 1c3deb2c07f0626e2d75e51446262a5ec151a10a57158d9328c96e8445aeb11b, ce2b5d73a19023e6402dece8468a6c987f3cfce2f6520aa5255883e0d78ee17d, ef3a230ef0b52b80b21db7d7e5fa8338954d5df6ded1bbf50d9613c007e645ee 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: 2f2d7fc9d67044854856cee43d00d5fe137bb60ff26e8fe936341b41eb97f42b, 980c76c4e3bfea599931536b680b94bc136c1408c7b7ca2114d09e0e9cbd730c, effcb8a2cf7a6b7acd6bf54529da24f3980cd396f87a209afd24fd00de236fe1, d91685a8630489f45ad67aa0775550fa3bb47796476992e94f02d986411a2198, 9b737f48161ab0e7b1a550016474fcf0d7706542cbb584d3a6223863b8ab3f9a result, different first party: 2feaea1d8f46f8eb7005e8ff5b90ef2cd6ad43a8d8db9172e68bc96d08514a69, db034729736e325762feaf208e6423ecab9c0ebb9e7db63b3744598a4fd8ec96, 1f3246b86e115f61df9e87000abf22a09990e60ff32ac1c1d2b917de10c44c28, 3386bcdf86afb831422c93ab34c713f7ad9d1e9b03200603de77eca34e0dc767, e362dd90e531888699160156c042183cdd8b521a2728a48fb718dd57c94cf47a 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: 00508613802cb2d0ed08d83f67b944b2fb22b9364881ce79f50eb5abe7f23efc, f3cad55225a69fc5d52fcdf689e94dc4694811d8c828fcfead8b7eba801bf288, 1827217011b1b4769f96261955f053fd9ac1c97bcee64ec7b519abc883dc695a, 6e733c4cb8ac416ac8b51beeab5011d3517c13bdd44a3134ff41000d2d85bbd6, 2274f766af158621f9b5ebfb39cb65a11a08821b45e7eab7605e9e2abec517f7 result, different first party: bcb758a3e7b2cc7c1addbd19ca2937b81d2e5bf1a4530dc11a189e4b456b0d4a, 6f2cee879f51118781fd93b6b39bf903bf083230d08efe3c0b3a3b592fc1003b, f1e90c4e6dabb7f45a749728c7b5bbcd168c5597aca3e7f3826a16654336f80c, e5d5f3b5f38c19a26f7f0bb4728a1da3f60d56862b6fca606e49f55b668f4320, 9b09618cce82660e0ce75e48d5bcfd9c2a71e58d7c33dd73762d9b5e1145011e 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: 6b5ff17f9b2339259ba88658c48ab30e8ab58c8f6e40ace8e68a0a211707e041, dbddc455b54194b84e9a73e0ae7cad76d0dfd85851827ffc8a5df38eb8114bcd, be3b244a091abefb7095bedf523c20751faedadf2f023bfa7b128ec174f282c2, 793e7b26e169d6c52d8cc284045cb18967e2fef0eda63ed55585d00cd979c212, 1178a205e9b890cc5e5e7e4400ce9ce47601998184972fe028bdba87c7f84cfd result, different first party: 8b544b592ecae799a084b37ab0bff7ad695af5846fafa26fe2335cac97a61260, 27c8dc1e04567cfd943759bcda0e25ca1ac7fcacfb571275f17bb0ad09ab64f9, a3c817f0763f71aba435db57143c4b1af4abc063f319fe49d5ec109847eebe6c, 269b8c5f542915cec7af124c23b502a4c351f6c0109c17ff0ad2a5ea13a00635, c3431d7fef108c4c1a4f4692ad35340b696b487bae4d1f68cc4e7a2ef0547e16 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: 36027edc8914e2bd6c6244ddbd0985a02f29a9f353331315b4c3f32e1a74d05b, 08bb5eab997afcdb808838e24024a1a236220e7b0dfb6980e66322ce5672a150, cc9dd799061ca9246eaa9b5c0462695536c93c3d26859cd418065d75d1e7b672, b218920995ca8821c1c52f7c3baeb376533918965086aba97a62005e39e29d90, fbe2c9083008f77cccb2d75ec5141db53a3030b6e8c300ec5c5539343910a8cf result, different first party: 4abd355d300adfaeba1df851938c319edc68a181ffdbe9b909f531a71a442f62, 27aacb4cae013f98d83596dc80e90e63361ebe7d8faac1d58ecc9e4b7a700f61, 8b3adc0162cc0889c1e6f40052cec9293d24bd870adcf2ecf9d1248a7922e4ac, d2f724e9e315f4c51721e50e4d9fc33d6d295e0c90e99a2926c0773aca842b1d, 1061cacb46361ae2fe81295050374d278e7ed73e71488569c9bfcdad70065615 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: 866b132739d2febf100720ee3e429d64466e9c9d7d2a33733677bc6b2003c775, ba28adfc3a53e416b0d0fe82e0d26b4e9f93a451e68a152223f90989b94c2168, 69544d6c65792911c4122ae124353d04ebce5ab036829d5420fcb424e8d6e058, af3b0071884a330a3ede52e724a4cb35ef7e6b32f68ce65117f0f2d4e7880c62, 1469db6f141c75c8d5e71f69e4a969b1b9bf8064c45aa2d833389f407c895b6f result, different first party: 98701a51f7fc2bf0e811cb66301e4490be5f26132a6073dedb0f67c33c004ba7, d3e72664fd8a20f159b3fb6fa112e16514eb6606478cdf85dae842de60d251aa, b470e04440777ac335a99585f3e42906375c39f480edf34178766084a519c61c, ea3e098570773479dcbe1c248119651a39f9094938f6d99a438dc64c3bcb7772, 838273941c4d5d8b54f6c79f9fa9d47176f76ab9cbce2f330c7d73441a0eae34 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: 101746b74ecf84182f466f28d774641a9d6c2190aeba1e2bc9555a59452754d8, 6231d1393f60992ec28e020cf7821dee5c341cf28d1ff040cad2330956c0e868, c3af2aaaaaff835f72dd4ad40ce7d9c9892a5dee7a1cbee56dd9732a5f58b579, 721ba1d1a5878b9d1969ee738016c7d5016993ee7bc12d598ba10cd951e97100, 50727066e7fe3ac1054e19c5aaa3e377ff2681765e8f1f3bccca2512a4e38e97 result, different first party: 37733b648bb7a8691c0ce5401007ad5f01ed70b416ce58dcc725d2bf38ac4832, b1dff12a3d64445820cdeb6e8dd9e998b955aade3d5c8f134700b5a9dff0e791, cd32d7e041f3261d695d7b05d95315f175cc091d52e93fb30ad491a1dbee3679, fd0d19f9a063f0f83ce03d35e00deda3288f5ee344f2967fd8a16e10f0d725de, a506733b17664b563b239659081bd2a3b9d7a879cdc1da6137313c331c3abf20 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: eaca4bcad3bf287fba19cf82a25d4e682a3ef12239ffd3ba7e805e7989514fb0, 6576181fd7c1bc65359758b03541e33293148d5ffc5e289e2e30f7e5fc004624, c6151c8c55ab1de39478abc35fd1d5f7d15c70f2a242af1c042457c37476a345 result, different first party: cb15539700b32e7041e62af575a4ab32822296a889acaa83d465d82786731828, 9fd0791b71ceedefbfb81c48a94f8509d8cbd33356da6f43c6276c7f2cb2bb31, 9546984ab29916e1ccfd12fec721be515cff07314113d3c4c32bccad4974a78e unsupported: false, false, false passed: true, true, true test failed: 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: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e, 79ee6b47-1671-410d-89e5-272dfe8f82a7, a9f61e2e-134d-4706-a669-d4ab500ef933, 90fd279e-0bb3-44cf-85b7-6aee552902a0, fece7d84-b460-461f-94af-e00d0faea51b 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: 5dd35ccc-732f-48ce-8885-7e736ada28c7, 472634ce-a168-4298-8334-77a464eb5f5b, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec, 7e99a54f-0dda-464f-b694-4d194704db03, d85388c0-e0c1-43af-aae4-4eeca7ad291c 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: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 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: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef 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: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e result, different first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e unsupported: false, false, false, false, false passed: false, false, false, false, false 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: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b result, different first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b unsupported: false, false, false, false, false passed: false, false, false, false, false 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: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 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: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 result, different first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 unsupported: false, false, false passed: false, false, false test failed: 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: 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) => { 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: 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) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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 result, different first party: 2, 2, 2 unsupported: false, false, false passed: true, true, true test failed: false, false, false
Navigation testsWhen you click a hyperlink to navigate your browser from one site to another, certain browser APIs allow the first site to communicate to the second site. These privacy vulnerabilities can be fixed by introducing new limits on how much data is transfered between sites.
document.referrerThe Referer [sic] request header is a mechanism used by browsers to let a website know where the user is visiting from. This header is inherently tracking users across websites. In recent times, browsers have switched to a policy of trimming a referrer to convey less tracking information, but Referer continues to convey cross-site tracking data by default.
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false passed: false, false, false test failed: 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: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e, 79ee6b47-1671-410d-89e5-272dfe8f82a7, a9f61e2e-134d-4706-a669-d4ab500ef933, 90fd279e-0bb3-44cf-85b7-6aee552902a0, fece7d84-b460-461f-94af-e00d0faea51b 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: 5dd35ccc-732f-48ce-8885-7e736ada28c7, 472634ce-a168-4298-8334-77a464eb5f5b, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec, 7e99a54f-0dda-464f-b694-4d194704db03, d85388c0-e0c1-43af-aae4-4eeca7ad291c result, different first party: Error: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document., Error: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 result, different first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 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: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 result, different first party: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 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: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef result, different first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef 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: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 result, different first party: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 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: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e result, different first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e 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: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b result, different first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b 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: fbf0cbcd-343d-4015-88ec-da52314bacf1, 59f9f586-47d6-49c9-a1fb-62759eac8e8f, 9d5a70af-7656-4718-8a8d-49774db04eb6, 3d89230e-eb92-4e87-b77c-a4d7ff16cced, 6173dbb7-a73f-429b-b98c-a31f1cc55bdf 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: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 result, different first party: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 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: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 result, different first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 unsupported: false, false, false passed: false, false, false test failed: 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: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e, 79ee6b47-1671-410d-89e5-272dfe8f82a7, a9f61e2e-134d-4706-a669-d4ab500ef933, 90fd279e-0bb3-44cf-85b7-6aee552902a0, fece7d84-b460-461f-94af-e00d0faea51b result, different first party: 5b788c19-60af-4f3c-baca-8a9b37a8ec3e, 79ee6b47-1671-410d-89e5-272dfe8f82a7, a9f61e2e-134d-4706-a669-d4ab500ef933, 90fd279e-0bb3-44cf-85b7-6aee552902a0, fece7d84-b460-461f-94af-e00d0faea51b 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: 5dd35ccc-732f-48ce-8885-7e736ada28c7, 472634ce-a168-4298-8334-77a464eb5f5b, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec, 7e99a54f-0dda-464f-b694-4d194704db03, d85388c0-e0c1-43af-aae4-4eeca7ad291c result, different first party: 5dd35ccc-732f-48ce-8885-7e736ada28c7, 472634ce-a168-4298-8334-77a464eb5f5b, 724d0bb4-a0f9-4f61-a176-6f14f234a8ec, 7e99a54f-0dda-464f-b694-4d194704db03, d85388c0-e0c1-43af-aae4-4eeca7ad291c 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: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 result, different first party: 510a63b8-35ec-4ecc-afc2-72dca3a9e7f1, cc82aa4f-71a6-4a80-8f3b-52d2c023ee57, 9c4eda50-7d03-4a9e-9d2c-d909e074a9f4, 221d11fd-e1b9-40fe-9cf9-69bf125da7e2, 9eb2ef4b-3cdd-47c6-8f67-c89c6800de62 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: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 result, different first party: edc74ee3-94ac-4f91-84ca-45603d90f048, 3ee3682c-64e9-49ee-9677-6f9c54840dc6, 24c228a2-aa8f-43f5-be24-2ccaca43befd, 3db9a558-b466-4b8a-b419-7ac94a1474ef, 4f17e379-aacc-4874-a52d-1b060029d491 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: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef result, different first party: f7756d22-efc8-4906-ba41-2f40f1c3c4ce, 347af39e-1e3e-45ba-a75b-2f3a555225a1, 503f270f-8597-4da0-9e34-a425d9ebf9bb, 4fb443a4-1525-432e-bf18-ed3ef9a50bec, 2d7033ad-dd28-493d-bf25-fbc8dad771ef 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: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 result, different first party: ef594855-81a5-447d-877d-d1bff5f6ed35, b316406a-8416-48a2-baa5-b22a965399fa, 870c62ad-b1f1-4593-a46d-c84e444d3644, e8438eaf-6786-4b0c-8575-b631fabbc1a3, 493511ba-419e-4d2a-af2a-42b5be171be7 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: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e result, different first party: 60742c58-8c9f-47b1-bced-87c5bc3808b1, 345e62c1-6d68-4f7d-985e-8c5c0e74803e, 227f79a5-c50d-4a23-9751-85880dbd6cbe, 194240f0-c09d-4bea-86dd-df6bded3344c, d631b088-09ec-4d27-9f85-60c18a6ba80e 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: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b result, different first party: 349adcda-1fce-41fb-91e4-09f0d3d764bd, e2e1327c-22ef-4412-b72d-0d3926b4e2a3, 948282db-07fd-473e-a766-8256139a3965, 1770c51d-3964-4d14-8eda-2b8bd540840c, 1d4ef7fa-1710-49cf-b75e-7ab9cb387d6b 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: fbf0cbcd-343d-4015-88ec-da52314bacf1, 59f9f586-47d6-49c9-a1fb-62759eac8e8f, 9d5a70af-7656-4718-8a8d-49774db04eb6, 3d89230e-eb92-4e87-b77c-a4d7ff16cced, 6173dbb7-a73f-429b-b98c-a31f1cc55bdf result, different first party: fbf0cbcd-343d-4015-88ec-da52314bacf1, 59f9f586-47d6-49c9-a1fb-62759eac8e8f, 9d5a70af-7656-4718-8a8d-49774db04eb6, 3d89230e-eb92-4e87-b77c-a4d7ff16cced, 6173dbb7-a73f-429b-b98c-a31f1cc55bdf 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: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 result, different first party: 40075437-5e63-422a-aced-933e10ddecc4, ac8330f3-c185-4a12-b504-2c696cedca73, 17563517-d3e6-4aec-9443-92c093499749, 96bdf699-6c33-471c-9ef1-2bb39886a6fa, 0cce88dc-2e73-4039-8441-2fb069bb7b79 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: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 result, different first party: 6f13cef0-66c1-482b-a5e4-bd8fef75aadc, 1fc43e52-b452-4505-a092-20b295a55bd7, 449cb234-16d8-490e-bec6-9390720ffd17 unsupported: false, false, false passed: false, false, false test failed: 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: true,true,true,true,true result: Insecure website never loaded,Insecure website never loaded,Insecure website never loaded,Insecure website never loaded,Insecure website never loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  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 result: 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: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false passed: 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: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false passed: 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: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: false,false,false,false,false result: loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true result: 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
  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 result: 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: 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
GPC enabled third-partyThe Global Privacy Control is an HTTP header that can be sent by a browser to instruct a visited website not to sell the user's personal data to other parties. This test checks to see if the GPC header is sent to third-party elements on the web page.
  sec-gpc: 1 passed: true,true,true,true,true
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false
IP address leakIP addresses can be used to uniquely identify a large percentage of users. A proxy, VPN, or Tor can mask a user's IP address.
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: true,true,true,true,true
  passed: false,false,false,false,false
  passed: false,false,false
Stream isolationBrowsers that use Tor can use a different Tor circuit per top-level website.
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: 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,true,false,false,false readSameFirstParty: 2602:fc05::39,2a0b:f4c0:16c:6::1,2a0b:f4c0:16c:9::1,185.107.47.215,2a0b:f4c2:1::1 readDifferentFirstParty: 2620:7:6001::140,2a0b:f4c1:2::250,2620:7:6001::184,Error: Unsupported,185.107.70.56 passed: true,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
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false
Tor enabledThe Tor network sends the browser's web requests through a series of relays to hide a user's IP address, thereby helping to mask their identity and location. This test checks to see if the Tor network is being used by default.
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: true,true,true,true,true passed: true,true,true,true,true
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false passed: 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: 640,640,640,640,640 desired value: 1263,1263,1263,1263,1263 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1677,1677,1677,1677,1677 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1416,1416,1416,1416,1416 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: undefined desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1285,1285,1285,1285,1285 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640 desired value: 1416,1416,1416 passed: false,false,false
Media query screen widthWidth of the user's screen in pixels.
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 980,980,980,980,980 desired value: 980,980,980,980,980 passed: true,true,true,true,true
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360 desired value: 980,980,980 passed: false,false,false
outerHeightHeight of the browser window in pixels, including browser chrome.
  expression: outerHeight desired expression: innerHeight actual value: 464,464,464,464,464 desired value: 1263,1263,1263,1263,1263 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 560,560,560,560,560 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 512,512,512,512,512 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 616,616,616,616,616 desired value: 1677,1677,1677,1677,1677 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 512,512,512,512,512 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 616,616,616,616,616 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 512,512,512,512,512 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 520,520,520,520,520 desired value: 1416,1416,1416,1416,1416 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1524,1524,1524,1524,1524 desired value: 1524,1524,1524,1524,1524 passed: true,true,true,true,true
  expression: outerHeight desired expression: innerHeight actual value: 472,472,472,472,472 desired value: 1285,1285,1285,1285,1285 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 520,520,520 desired value: 1416,1416,1416 passed: false,false,false
screen.heightHeight of the user's screen, in pixels.
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1263,1263,1263,1263,1263 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1677,1677,1677,1677,1677 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1416,1416,1416,1416,1416 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1524,1524,1524,1524,1524 desired value: 1524,1524,1524,1524,1524 passed: true,true,true,true,true
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1285,1285,1285,1285,1285 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640 desired value: 1416,1416,1416 passed: false,false,false
screen.widthWidth of the user's screen, in pixels.
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 980,980,980,980,980 desired value: 980,980,980,980,980 passed: true,true,true,true,true
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360 desired value: 980,980,980 passed: false,false,false
screenXPosition, in pixels, of the left edge of the browser window on screen.
  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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 0,0,0 desired value: 0,0,0 passed: true,true,true
screenYPosition, in pixels, of the top edge of the browser window on screen.
  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: 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: 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: 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: 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: 24,24,24,24,24 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: 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: 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: 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: 0,0,0 desired value: 0,0,0 passed: true,true,true
Tracking query parameter testsWhen you browse from one web page to another, tracking companies will frequently attach a 'tracking query parameter' to the address of the second web page. That query parameter may contain a unique identifier that tracks you individually as you browse the web. And these query parameters are frequently synchronized with cookies, making them a powerful tracking vector. Web browsers can protect you from known tracking query parameters by stripping them from web addresses before your browser sends them. (The set of tracking query parameters tested here was largely borrowed from Brave.)
__hsfpHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
__hsscHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
__hstcHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
__sDrip.com email address tracking parameter
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
_hsencHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
_openstatYandex tracking parameter
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
dclidDoubleClick Click ID (Google)
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
fbclidFacebook Click Identifier
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
gclidGoogle Click Identifier
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
hsCtaTrackingHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
igshidInstagram tracking parameter
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
mc_eidMailchimp Email ID (email recipient's address)
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
mkt_tokAdobe Marketo tracking parameter
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
ml_subscriberMailerLite email tracking
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
ml_subscriber_hashMailerLite email tracking
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
msclkidMicrosoft Click ID
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
oly_anon_idOmeda marketing 'anonymous' customer id
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
oly_enc_idOmeda marketing 'known' customer id
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
rb_clickidUnknown high-entropy tracking parameter
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
s_cidAdobe Site Catalyst tracking parameter
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
vero_convVero tracking parameter
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
vero_idVero tracking parameter
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
wickedidWicked Reports e-commerce tracking
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false
yclidYandex Click ID
  passed: true,true,true,true,true
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: false,false,false,false,false
  value: 89396123079165 passed: 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: 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: 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: 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
Adobe Audience ManagerTests whether the browser blocks the page from loading the tracker at https://dpm.demdex.net/ibs
  url: https://dpm.demdex.net/ibs passed: true,true,true,true,true
  url: https://dpm.demdex.net/ibs passed: true,true,true,true,true
  url: https://dpm.demdex.net/ibs passed: false,false,false,false,false
  url: https://dpm.demdex.net/ibs passed: true,true,true,true,true
  url: https://dpm.demdex.net/ibs passed: false,false,false,false,false
  url: https://dpm.demdex.net/ibs passed: false,false,false,false,false
  url: https://dpm.demdex.net/ibs passed: true,true,true,true,true
  url: https://dpm.demdex.net/ibs passed: false,false,false,false,false
  url: https://dpm.demdex.net/ibs passed: false,false,false,false,false
  url: https://dpm.demdex.net/ibs passed: false,false,false,false,false
  url: https://dpm.demdex.net/ibs passed: false,false,false
Amazon adsystemTests whether the browser blocks the page from loading the tracker at https://s.amazon-adsystem.com/dcm
  url: https://s.amazon-adsystem.com/dcm passed: true,true,true,true,true
  url: https://s.amazon-adsystem.com/dcm passed: true,true,true,true,true
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false,false,false
  url: https://s.amazon-adsystem.com/dcm passed: true,true,true,true,true
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false,false,false
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false,false,false
  url: https://s.amazon-adsystem.com/dcm passed: true,true,true,true,true
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false,false,false
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false,false,false
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false,false,false
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false
AppNexusTests whether the browser blocks the page from loading the tracker at https://ib.adnxs.com/px?id=178248&t=1
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: true,true,true,true,true
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: true,true,true,true,true
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: false,false,false,false,false
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: true,true,true,true,true
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: false,false,false,false,false
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: false,false,false,false,false
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: true,true,true,true,true
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: false,false,false,false,false
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: false,false,false,false,false
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: false,false,false,false,false
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: 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: 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: 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
ChartbeatTests whether the browser blocks the page from loading the tracker at https://static.chartbeat.com/js/chartbeat.js
  url: https://static.chartbeat.com/js/chartbeat.js passed: true,true,true,true,true
  url: https://static.chartbeat.com/js/chartbeat.js passed: true,true,true,true,true
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: true,true,true,true,true
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false
CriteoTests whether the browser blocks the page from loading the tracker at https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: true,true,true,true,true
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: true,true,true,true,true
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: false,false,false,false,false
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: true,true,true,true,true
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: false,false,false,false,false
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: false,false,false,false,false
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: true,true,true,true,true
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: false,false,false,false,false
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: false,false,false,false,false
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: false,false,false,false,false
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: 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: 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: 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: 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
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: 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: 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: 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
Google (third-party ad pixel)Tests whether the browser blocks the page from loading the tracker at https://www.google.com/pagead/1p-user-list/
  url: https://www.google.com/pagead/1p-user-list/ passed: true,true,true,true,true
  url: https://www.google.com/pagead/1p-user-list/ passed: true,true,true,true,true
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: 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: 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: 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
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: 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: 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
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: 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: 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: 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
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: 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: 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: 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
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: true,true,true,true,true
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: true,true,true,true,true
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: 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
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: 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: 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: 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
TaboolaTests whether the browser blocks the page from loading the tracker at https://trc.taboola.com/futureplc-tomsguide/trc/3/json
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: true,true,true,true,true
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: true,true,true,true,true
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: true,true,true,true,true
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false
Twitter pixelTests whether the browser blocks the page from loading the tracker at https://t.co/i/adsct
  url: https://t.co/i/adsct passed: true,true,true,true,true
  url: https://t.co/i/adsct passed: true,true,true,true,true
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: true,true,true,true,true
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: true,true,true,true,true
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: 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: 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: 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: 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