Nightly builds
(click anywhere for more info)


brave
1.33

brave
1.33

private

brave
1.33

Tor

chrome
98.0

chrome
98.0

private

edge
97.0

edge
97.0

private

firefox
96.0a1

firefox
96.0a1

private

opera
83.0

opera
83.0

private

safari
15.4

safari
15.4

private

tor
tbb-nightly.2021

vivaldi
4.4

vivaldi
4.4

private
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: h2, h2, h2, h2, h2 result, different first party: h2, h2, h2, h2, h2 unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h2, h2, h2, h2, h2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h2, h2, h2, h2, h2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3 result, different first party: h3, h3, h3 unsupported: false, false, false passed: false, false, false test failed: 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: h2, h2, h2, h2, h2 result, different first party: h2, h2, h2, h2, h2 unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; for (let i = 0; i < 10 && responseText !== "h2"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/clear"); console.log("clear", responseText, i); await sleepMs(10); } if (responseText !== "h2") { // Clearing failed. throw new Error("Unsupported"); } // Store "h3" state in Alt-Svc cache for (let i = 0; i < 10 && responseText !== "h3"; ++i) { responseText = await fetchText("https://h3.arthuredelstein.net:4433/protocol"); console.log("protocol", responseText, i); await sleepMs(10); } if (responseText !== "h3") { // Storage failed. throw new Error("Unsupported"); } } read: () => fetchText("https://h3.arthuredelstein.net:4433/protocol") result, same first party: h3, h3, h3, h3, h3 result, different first party: h3, h3, h3, h3, h3 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
blobA 'blob URL' is a local reference to some raw data. Trackers can use a blob URL to share data between websites.
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 43083921537220315, 2267945238435487, 020218253580662093, 06851619724054703, 40917841721759074 result, different first party: 43083921537220315, 2267945238435487, 020218253580662093, 06851619724054703, 40917841721759074 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 7710601553830287, 14973016969864905, 34117962807378066, 320062400533317, 8871591746189611 result, different first party: 7710601553830287, 14973016969864905, 34117962807378066, 320062400533317, 8871591746189611 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 9666089426101159, 8302718219336052, 3712505204834988, 8309447967898387, 41381580536465457 result, different first party: 9666089426101159, 8302718219336052, 3712505204834988, 8309447967898387, 41381580536465457 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 result, different first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 result, different first party: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 result, different first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 result, different first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 10537561493705905, 5049605471524656, 8591626552078637, 2483500649498751, 8681560432597817 result, different first party: 10537561493705905, 5049605471524656, 8591626552078637, 2483500649498751, 8681560432597817 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 28359830378062045, 03378240204446992, 014310536075349267, 4649319669418428, 9866423964914195 result, different first party: 28359830378062045, 03378240204446992, 014310536075349267, 4649319669418428, 9866423964914195 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 result, different first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 44470298708110456, 10785576441071254, 38939346876549585 result, different first party: 44470298708110456, 10785576441071254, 38939346876549585 unsupported: false, false, false passed: false, false, false test failed: false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 9578796843211312, 7809160918175175, 2875220664905631, 9801423662247251, 5974689994151197 result, different first party: 9578796843211312, 7809160918175175, 2875220664905631, 9801423662247251, 5974689994151197 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 23713777274933023, 7953289494205931, 35086920442271663, 3198659686754892, 8573071760908417 result, different first party: 23713777274933023, 7953289494205931, 35086920442271663, 3198659686754892, 8573071760908417 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 05583988147739816, 36516184055995526, 17483118622412652, 4384437278079143, 07108491630590397 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 { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 result, different first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { return URL.createObjectURL(new Blob([secret])); } catch (e) { throw new Error("Unsupported"); } } read: async (url) => { if (url) { let response = await fetch(url); return response.text(); } } result, same first party: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 result, different first party: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
BroadcastChannelA BroadcastChannel is designed to send messages between tabs. In some browsers it can be used for cross-site communication and tracking.
  write: (secret) => { try { let bc = new BroadcastChannel("secrets"); bc.onmessage = (event) => { if (event.data === "request") { bc.postMessage(secret); } }; } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let bc = new BroadcastChannel("secrets"); bc.onmessage = (event) => { if (event.data !== "request") { resolve(event.data); } }; bc.postMessage("request"); setTimeout(() => reject({message: "no BroadcastChannel message"}), 3000); }) result, same first party: 8576691694999916, 2267945238435487, 020218253580662093, 06851619724054703, 40917841721759074 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: 7710601553830287, 14973016969864905, 34117962807378066, 320062400533317, 8871591746189611 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: 9666089426101159, 8302718219336052, 3712505204834988, 8309447967898387, 41381580536465457 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: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 result, different first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 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: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 result, different first party: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 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: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 result, different first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 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: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 result, different first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 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: 10537561493705905, 5049605471524656, 8591626552078637, 2483500649498751, 8681560432597817 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: 28359830378062045, 03378240204446992, 014310536075349267, 4649319669418428, 9866423964914195 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: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 result, different first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 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: 44470298708110456, 10785576441071254, 38939346876549585 result, different first party: 44470298708110456, 10785576441071254, 38939346876549585 unsupported: false, false, false passed: false, false, false test failed: 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: 9578796843211312, 7809160918175175, 2875220664905631, 9801423662247251, 5974689994151197 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: 23713777274933023, 7953289494205931, 35086920442271663, 3198659686754892, 8573071760908417 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: 05583988147739816, 36516184055995526, 17483118622412652, 4384437278079143, 07108491630590397 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: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 result, different first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 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: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 result, different first party: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
CacheStorageThe Cache API is a content storage mechanism originally introduced to support ServiceWorkers. If the same Cache object is accessible to multiple websites, it can be abused to track users.
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 4904458619297689, 4904458619297689, 4904458619297689, 4904458619297689, 4904458619297689 result, different first party: Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 7710601553830287, 14973016969864905, 34117962807378066, 320062400533317, 8871591746189611 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 9666089426101159, 8302718219336052, 3712505204834988, 8309447967898387, 41381580536465457 result, different first party: Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 7713812791106474, 7713812791106474, 7713812791106474, 7713812791106474, 7713812791106474 result, different first party: 7713812791106474, 7713812791106474, 7713812791106474, 7713812791106474, 7713812791106474 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 result, different first party: Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 6636018278968578, 6636018278968578, 6636018278968578, 6636018278968578, 6636018278968578 result, different first party: 6636018278968578, 6636018278968578, 6636018278968578, 6636018278968578, 6636018278968578 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 result, different first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 34902356269690116, 10537561493705905, 10537561493705905, 10537561493705905, 10537561493705905 result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 9845626839525028, 9845626839525028, 9845626839525028, 9845626839525028, 9845626839525028 result, different first party: 9845626839525028, 9845626839525028, 9845626839525028, 9845626839525028, 9845626839525028 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 44470298708110456, 10785576441071254, 38939346876549585 result, different first party: Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent. unsupported: false, false, false passed: true, true, true test failed: false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 8252607238780023, 8252607238780023, 8252607238780023, 8252607238780023, 8252607238780023 result, different first party: Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url') unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 8252607238780023, 8252607238780023, 8252607238780023, 8252607238780023, 8252607238780023 result, different first party: Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url') unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 09343115329045415, 09343115329045415, 09343115329045415, 09343115329045415, 09343115329045415 result, different first party: 09343115329045415, 09343115329045415, 09343115329045415, 09343115329045415, 09343115329045415 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 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
cookieThe cookie, first introduced by Netscape in 1994, is a small amount of data stored by your browser on a website's behalf. It has legitimate uses, but it is also the classic cross-site tracking mechanism, and today still the most popular method of tracking users across websites. Browsers can stop cookies from being used for cross-site tracking by either blocking or partitioning them.
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 43083921537220315, 2267945238435487, 020218253580662093, 06851619724054703, 40917841721759074 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 7710601553830287, 14973016969864905, 34117962807378066, 320062400533317, 8871591746189611 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 9666089426101159, 8302718219336052, 3712505204834988, 8309447967898387, 41381580536465457 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 result, different first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 result, different first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 result, different first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 10537561493705905, 5049605471524656, 8591626552078637, 2483500649498751, 8681560432597817 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 28359830378062045, 03378240204446992, 014310536075349267, 4649319669418428, 9866423964914195 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 result, different first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 44470298708110456, 10785576441071254, 38939346876549585 result, different first party: , , unsupported: false, false, false passed: true, true, true test failed: false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 9578796843211312, 7809160918175175, 2875220664905631, 9801423662247251, 5974689994151197 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 23713777274933023, 7953289494205931, 35086920442271663, 3198659686754892, 8573071760908417 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 05583988147739816, 36516184055995526, 17483118622412652, 4384437278079143, 07108491630590397 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 result, different first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { let expiry = new Date(); expiry.setFullYear(expiry.getFullYear() + 1); document.cookie = `secret=${secret}; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=(\S+)/)[1] : null result, same first party: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
CSS cacheCSS stylesheets are cached, and if that cache is shared between websites, it can be used to track users across sites.
  write: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", 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 link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", 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 link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", 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, 1 unsupported: false, false, false, false, false passed: true, true, true, true, false test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", 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 link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 2, 1, 1 unsupported: false, false, false, false, false passed: false, false, true, false, false test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 2, 1 unsupported: false, false, false, false, false passed: false, false, false, true, false test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", 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 link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 2 result, different first party: 2, 2, 2, 2, 3 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 = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", 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 link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", 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 link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", 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
  write: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 2, 2, 2, 2, 2 result, different first party: 3, 3, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 2, 2, 2, 2, 2 result, different first party: 3, 3, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", 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 link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 1, 1 unsupported: false, false, false, false, false passed: true, true, true, false, false test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "stylesheet"; document.getElementsByTagName("head")[0].appendChild(link); let cssLoadPromise = new Promise((resolve, reject) => link.addEventListener("load", resolve, {once:true})); link.href = testURI("resource", "css", key); await cssLoadPromise; let response = await fetch( testURI("ctr", "css", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 2, 1, 1 unsupported: false, false, false, false, false passed: false, false, true, false, false test failed: false, false, false, false, false
favicon cacheA favicon is an icon that represents a website, typically shown in browser tab and bookmarks menu. If the favicon cache is not partitioned, it can be used to track users across websites.
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 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: 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: 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, 2, 2, 2 result, different first party: 2, 2, 3, 3, 3 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 result, different first party: 2, 2, 2 unsupported: false, false, false passed: true, true, true test failed: false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 2, 2, 2, 2, 2 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 2, 2, 2, 2, 2 result, different first party: 3, 3, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
fetch cacheWhen a resource is received via the Fetch API, it is frequently cached. That cache can potentially be abused for cross-site tracking.
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 2, 2, 2, 2, 2 result, different first party: 3, 3, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 2, 2, 2, 2, 2 result, different first party: 3, 3, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
font cacheWeb fonts are sometimes stored in their own cache, which is vulnerable to being abused for cross-site tracking.
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 1 unsupported: false, false, false, false, false passed: true, true, true, true, 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: 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: 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, 2, 2, 2 result, different first party: 2, 2, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1 result, different first party: 1, 1, 1 unsupported: false, false, false passed: false, false, false test failed: false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 2, 2, 2, 2, 2 result, different first party: 3, 3, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 2, 2, 2, 2, 2 result, different first party: 3, 3, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
H1 connectionHTTP/1.x are the classic web connection protocols. If these connections are re-used across websites, they can be used to track users.
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 8576691694999916, 2267945238435487, 020218253580662093, 06851619724054703, 40917841721759074 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 7710601553830287, 14973016969864905, 34117962807378066, 320062400533317, 8871591746189611 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=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 9666089426101159, 8302718219336052, 3712505204834988, 8309447967898387, 41381580536465457 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 result, different first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 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=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 result, different first party: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 result, different first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 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=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 result, different first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 10537561493705905, 5049605471524656, 8591626552078637, 2483500649498751, 8681560432597817 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=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 28359830378062045, 03378240204446992, 014310536075349267, 4649319669418428, 9866423964914195 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 result, different first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 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=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 44470298708110456, 10785576441071254, 38939346876549585 result, different first party: 44470298708110456, 10785576441071254, 38939346876549585 unsupported: false, false, false passed: false, false, false test failed: false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 9578796843211312, 7809160918175175, 2875220664905631, 9801423662247251, 5974689994151197 result, different first party: 9578796843211312, 7809160918175175, 2875220664905631, 9801423662247251, 5974689994151197 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=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 23713777274933023, 7953289494205931, 35086920442271663, 3198659686754892, 8573071760908417 result, different first party: 23713777274933023, 7953289494205931, 35086920442271663, 3198659686754892, 8573071760908417 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 05583988147739816, 36516184055995526, 17483118622412652, 4384437278079143, 07108491630590397 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=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 result, different first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`); return await response.text(); } result, same first party: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 result, different first party: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
H2 connectionHTTP/2 is a web connection protocol introduced in 2015. Some browsers re-use HTTP/2 connections across websites and can thus be used to track users.
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 8576691694999916, 2267945238435487, 020218253580662093, 06851619724054703, 40917841721759074 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 7710601553830287, 14973016969864905, 34117962807378066, 320062400533317, 8871591746189611 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=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 9666089426101159, 8302718219336052, 3712505204834988, 8309447967898387, 41381580536465457 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 result, different first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 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=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 result, different first party: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 result, different first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 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=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 result, different first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 10537561493705905, 5049605471524656, 8591626552078637, 2483500649498751, 8681560432597817 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=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 28359830378062045, 03378240204446992, 014310536075349267, 4649319669418428, 9866423964914195 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 result, different first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 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=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 44470298708110456, 10785576441071254, 38939346876549585 result, different first party: 44470298708110456, 10785576441071254, 38939346876549585 unsupported: false, false, false passed: false, false, false test failed: false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 9578796843211312, 7809160918175175, 2875220664905631, 9801423662247251, 5974689994151197 result, different first party: 9578796843211312, 7809160918175175, 2875220664905631, 9801423662247251, 5974689994151197 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=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 23713777274933023, 7953289494205931, 35086920442271663, 3198659686754892, 8573071760908417 result, different first party: 23713777274933023, 7953289494205931, 35086920442271663, 3198659686754892, 8573071760908417 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 05583988147739816, 36516184055995526, 17483118622412652, 4384437278079143, 07108491630590397 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=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 result, different first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`); return await response.text(); } result, same first party: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 result, different first party: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
H3 connectionHTTP/3 is a new standard HTTP connection protocol, still in draft but widely supported by browsers. If it is not partitioned, it can be used to track users across websites.
  write: async (secret) => { // Ensure that we can switch over to h3 via alt-svc: for (let i = 0; i<3; ++i) { await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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: 09bec2d5ffd00afb82d54e89964fe0c4, b09a14b34d6b88286873b02dfe18c0a5, de666a8bc2014ad63f6a13bb6e92308d, f6a61b22e2807ed9407eb60017d97880, 490f8fb1e614dc918c0448570ca40b69 result, different first party: ecbbcaf046d3fc00684108fdd89ef95f, c1098357c4ce8118c77e9ca285363917, bb1f96e2b60230c3337c60f197b4456e, b6abac62276dc94d3b5f21be1dd08546, 44be2e98168dbb9e64f1ecb5c4b13ddc 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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: 54722736f67dd24811f4e1a23dfb77fc, 9a565ad4f1a4e3df5e7f811ec29a52bf, 9548e05a32d361bc257b11df875cb6b4, b63ac8e518dacd3552581ede040fe850, b14bc5ad2c443036dbc4fd3e3f50fa7e result, different first party: 2f1a0e3eeb98ded9be52781db41b0a6b, 14d3a07c78c22988cfeaeed62d58c7be, 367139a4dc317dbab54afbb61e646100, a83d7791d957ae4bd2fbaf6c13e6cdb0, 0fdb27ebf23d2e3f011dd14a88d31082 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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: 429dec11e16813f146fc7c75a9cc6983, 080faf152891260aa15465334a90c916, 0452c2f2896a11f13b4952226c196086, df52d77cc41acef7a0173c8bd7385740, 02ad049a6de03c6e1055634e14cdb02c result, different first party: 429dec11e16813f146fc7c75a9cc6983, 080faf152891260aa15465334a90c916, 0452c2f2896a11f13b4952226c196086, df52d77cc41acef7a0173c8bd7385740, 02ad049a6de03c6e1055634e14cdb02c 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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: 0fb65fc506028d3ee4585eda40d39b1d, 5b51da66e1fcda6c7507e65afcd5ce85, 3f1df634e538c5e620ca01323c097403, a75fe3bd32db30ba75a0ffb253a2d67d, dead91b915f11e3c728a95281f590b8e result, different first party: 0fb65fc506028d3ee4585eda40d39b1d, 5b51da66e1fcda6c7507e65afcd5ce85, 3f1df634e538c5e620ca01323c097403, a75fe3bd32db30ba75a0ffb253a2d67d, dead91b915f11e3c728a95281f590b8e 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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: 4572fe1ccf9e6b048e2611774a08acc5, 8c5fae5935fff4c4778d059df935f3db, 889636931af81024ea9da9e13fd657e6, 45a285193710f41005199328011875a9, 66dc317acd4da848e72fb61bf5452944 result, different first party: 4572fe1ccf9e6b048e2611774a08acc5, 8c5fae5935fff4c4778d059df935f3db, 889636931af81024ea9da9e13fd657e6, 45a285193710f41005199328011875a9, 66dc317acd4da848e72fb61bf5452944 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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: 31524601ffdb7509b5d95d44ca6bbac8, e3321ed623d5bb0212aac1d8a8494f43, bb8bff73aaaa1bed0e44fd66e8584cd2, e85221c2d2a37da31dedad5a7a36aaab, 5e688fdc04acda5eaf3f00b9c0ff2d20 result, different first party: 31524601ffdb7509b5d95d44ca6bbac8, e3321ed623d5bb0212aac1d8a8494f43, bb8bff73aaaa1bed0e44fd66e8584cd2, e85221c2d2a37da31dedad5a7a36aaab, 5e688fdc04acda5eaf3f00b9c0ff2d20 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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: 10a73340689a68934c1739e667371b6d, 8f7f2aaa0d01ff7072f56ef407a0c029, 93a30457426a6bbc7aed4fa355cfa260, 68441928d9029b578fb15bccd61a6557, 7f1e1e7a11d6f6b076cf6d6a72ec86bf result, different first party: b39d8fd9efc31d518fe12c4648311253, 83566836ebb7930d5cd880edcc1327d1, 180c59986700f17d1ca06691f9432315, 62990768d05f2e9d1c7f62280594c0f9, b46feaf6d2a6de8231ee2b866852e859 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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: cf5c5906c45785502b8a8057a6866777, fd3ee66975566900f3ac8a29277c41de, e087cde425f00c3d61a424cfbc83b1d8, d07e42d3f2f2e4b7790e9574fb15a2a2, fcc6e5e3ea33fc7a432603bbd299b3c3 result, different first party: e7e489a77e6a87739a356b4d4aafec12, , da8817bf4bea10aa87cb952905b5879b, 6c995671e5941383e2979c5a3eb69c03, f99ed6213aeefc3fa20aa5c9900de671 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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: db35ffb0f4bf76b28abbb8c7ce6b7b9f, 8ff28c2ef3db66cbe163dfeef6d2cc12, 4368ad96a29c56354a391980eaaf2487, 2886c553b12368c3af8972c564a54b53, de7ff247d6ea7ef83b08363732367afb result, different first party: db35ffb0f4bf76b28abbb8c7ce6b7b9f, 8ff28c2ef3db66cbe163dfeef6d2cc12, 4368ad96a29c56354a391980eaaf2487, 2886c553b12368c3af8972c564a54b53, de7ff247d6ea7ef83b08363732367afb 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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: 94445d86e72a6afb008e2811c3317302, 308044b1b0a804be44b1e9eda18da7dc, a6dad861b358c827ce8a25e02e1115d7 result, different first party: 94445d86e72a6afb008e2811c3317302, 308044b1b0a804be44b1e9eda18da7dc, a6dad861b358c827ce8a25e02e1115d7 unsupported: false, false, false passed: false, false, false test failed: 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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: 7956feb335f16bb23a3e85da1c87aaf6, 28dd73daf0fced50f78b1bf697c63888, 89a585564b22527f7d6815d0e0362070, 03c43f66616b1e31cd396ef325187391, 4f1c342b530a206ca9e95d78fbe3f0bf result, different first party: 7956feb335f16bb23a3e85da1c87aaf6, 28dd73daf0fced50f78b1bf697c63888, 89a585564b22527f7d6815d0e0362070, 03c43f66616b1e31cd396ef325187391, 4f1c342b530a206ca9e95d78fbe3f0bf 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`); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4433/connection_id`); 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: dcc009df6e28395f19b0419324acdd2c, f0609299e7967449334050305c07ff3e, 9c9a8ebaeed83901b63e316203e3c48f, 9b8d803f3475db03991b08d32c6b282b, 4ff1b8b4ba97128d282dca880bfed745 result, different first party: dcc009df6e28395f19b0419324acdd2c, f0609299e7967449334050305c07ff3e, 9c9a8ebaeed83901b63e316203e3c48f, 9b8d803f3475db03991b08d32c6b282b, 4ff1b8b4ba97128d282dca880bfed745 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
HSTS cacheThe HTTP Strict-Transport-Security response header allows a website to signal that it should only be accessed via HTTPS. The browser remembers this directive in a database, but if this database is not partitioned, then it can be used to track users across websites.
  write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded result, different first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded result, different first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded result, different first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded result, different first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded result, different first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded result, different first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded result, different first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded result, different first party: Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded result, different first party: Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded result, different first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: image load succeeded, image load succeeded, image load succeeded result, different first party: image load succeeded, image load succeeded, image load succeeded unsupported: false, false, false passed: false, false, false test failed: false, false, false
write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed result, different first party: Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed result, different first party: Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed result, different first party: Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed, Error: image load failed unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded result, different first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: () => { let image = document.getElementById("hsts-image"); image.src = "https://hsts.arthuredelstein.net/set_hsts.png"; } read: () => new Promise((resolve, reject) => { let image = document.getElementById("hsts-image"); image.onload = () => resolve("image load succeeded"); image.onerror = () => reject(new Error("image load failed")); image.src = "http://hsts.arthuredelstein.net/test_hsts.png"; }) result, same first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded result, different first party: image load succeeded, image load succeeded, image load succeeded, image load succeeded, image load succeeded unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
iframe cacheAn iframe is an element in a web page than allows websites to embed a second web page. Caching of this web page could be abused for cross-site tracking.
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 2, 2 result, different first party: 2, 2, 2, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let 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
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
image cacheCaching of images in web browsers is a standard behavior. But if that cache leaks between websites, it can be abused for cross-site tracking.
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 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: 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, 2, 2, 1 result, different first party: 2, 2, 3, 3, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 2, 2, 2, 2, 2 result, different first party: 3, 3, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 2, 2, 2, 2, 2 result, different first party: 3, 3, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
indexedDBThe IndexedDB API exposes a transactional database to web pages. That database can be used to track users across websites, unless it is partitioned.
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: 8576691694999916, 2267945238435487, 020218253580662093, 06851619724054703, 40917841721759074 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: 7710601553830287, 14973016969864905, 34117962807378066, 320062400533317, 8871591746189611 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: 9666089426101159, 8302718219336052, 3712505204834988, 8309447967898387, 41381580536465457 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: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 result, different first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 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: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 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: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 result, different first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 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: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 result, different first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 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: 10537561493705905, 5049605471524656, 8591626552078637, 2483500649498751, 8681560432597817 result, different first party: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations. result, different first party: Error: 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. 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: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 result, different first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 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: 44470298708110456, 10785576441071254, 38939346876549585 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. unsupported: false, false, false passed: true, true, true test failed: 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: 9578796843211312, 7809160918175175, 2875220664905631, 9801423662247251, 5974689994151197 result, different first party: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: 23713777274933023, 7953289494205931, 35086920442271663, 3198659686754892, 8573071760908417 result, different first party: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations. result, different first party: Error: 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. 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: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 result, different first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 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: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 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
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: 43083921537220315, 2267945238435487, 020218253580662093, 06851619724054703, 40917841721759074 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: 7710601553830287, 14973016969864905, 34117962807378066, 320062400533317, 8871591746189611 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: 9666089426101159, 8302718219336052, 3712505204834988, 8309447967898387, 41381580536465457 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: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 result, different first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 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: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 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: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 result, different first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 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: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 result, different first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 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: 10537561493705905, 5049605471524656, 8591626552078637, 2483500649498751, 8681560432597817 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: 28359830378062045, 03378240204446992, 014310536075349267, 4649319669418428, 9866423964914195 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: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 result, different first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 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: 44470298708110456, 10785576441071254, 38939346876549585 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. unsupported: false, false, false passed: true, true, true test failed: false, false, false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: 9578796843211312, 7809160918175175, 2875220664905631, 9801423662247251, 5974689994151197 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: 23713777274933023, 7953289494205931, 35086920442271663, 3198659686754892, 8573071760908417 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: 05583988147739816, 36516184055995526, 17483118622412652, 4384437278079143, 07108491630590397 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: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 result, different first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 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: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 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
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: 43083921537220315, 2267945238435487, 020218253580662093, 06851619724054703, 40917841721759074 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: 7710601553830287, 14973016969864905, 34117962807378066, 320062400533317, 8871591746189611 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: 9666089426101159, 8302718219336052, 3712505204834988, 8309447967898387, 41381580536465457 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: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 result, different first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 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: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 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: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 result, different first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 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: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 result, different first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: async (key) => { if (navigator.locks) { navigator.locks.request(key, lock => new Promise((f,r) => {})); let queryResult = await navigator.locks.query(); return queryResult.held[0].clientId; } else { throw new Error("Unsupported"); } } read: async () => { if (navigator.locks) { let queryResult = await navigator.locks.query(); return queryResult.held[0].name; } } result, same first party: undefined result, different first party: undefined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: async (key) => { if (navigator.locks) { navigator.locks.request(key, lock => new Promise((f,r) => {})); let queryResult = await navigator.locks.query(); return queryResult.held[0].clientId; } else { throw new Error("Unsupported"); } } read: async () => { if (navigator.locks) { let queryResult = await navigator.locks.query(); return queryResult.held[0].name; } } result, same first party: undefined result, different first party: undefined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { if (navigator.locks) { navigator.locks.request(key, lock => new Promise((f,r) => {})); let queryResult = await navigator.locks.query(); return queryResult.held[0].clientId; } else { throw new Error("Unsupported"); } } read: async () => { if (navigator.locks) { let queryResult = await navigator.locks.query(); return queryResult.held[0].name; } } result, same first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 result, different first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 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: 44470298708110456, 10785576441071254, 38939346876549585 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. unsupported: false, false, false passed: true, true, true test failed: false, false, false
write: async (key) => { if (navigator.locks) { navigator.locks.request(key, lock => new Promise((f,r) => {})); let queryResult = await navigator.locks.query(); return queryResult.held[0].clientId; } else { throw new Error("Unsupported"); } } read: async () => { if (navigator.locks) { let queryResult = await navigator.locks.query(); return queryResult.held[0].name; } } result, same first party: undefined result, different first party: undefined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: async (key) => { if (navigator.locks) { navigator.locks.request(key, lock => new Promise((f,r) => {})); let queryResult = await navigator.locks.query(); return queryResult.held[0].clientId; } else { throw new Error("Unsupported"); } } read: async () => { if (navigator.locks) { let queryResult = await navigator.locks.query(); return queryResult.held[0].name; } } result, same first party: undefined result, different first party: undefined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: async (key) => { if (navigator.locks) { navigator.locks.request(key, lock => new Promise((f,r) => {})); let queryResult = await navigator.locks.query(); return queryResult.held[0].clientId; } else { throw new Error("Unsupported"); } } read: async () => { if (navigator.locks) { let queryResult = await navigator.locks.query(); return queryResult.held[0].name; } } result, same first party: 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: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 result, different first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 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: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 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
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: 1, 1, 1, 2, 1 unsupported: false, false, false, false, false passed: false, false, false, true, 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: 1, 1, 2, 1, 1 unsupported: false, false, false, false, false passed: false, false, true, 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, 2, 1 unsupported: false, false, false, false, false passed: false, false, false, true, 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, 2, 2, 2 result, different first party: 2, 2, 3, 3, 3 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let 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: 2, 2, 2 unsupported: false, false, false passed: true, true, true test failed: false, false, false
write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received result, different first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received result, different first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 1, 1 unsupported: false, false, false, false, false passed: true, true, true, 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, 2, 1, 1 unsupported: false, false, false, false, false passed: false, false, true, false, false test failed: false, false, false, false, false
ServiceWorkerThe ServiceWorker API allows websites to run code in the background and store content in the browser for offline use. If a ServiceWorker can be accessed from multiple websites, it can be abused to track users across sites.
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 08954629993587115, 8650413234558787, 5351844227521672, 3105869608430729, 06461716029786513 result, different first party: Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 7168053110455261, 8017961726436773, 25898583576712886, 18496184722130482, 46652887231444873 result, different first party: Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 0874054298221214, 8772660708267592, 67781738709359, 9454382010485651, 19993177914009674 result, different first party: Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 15735466354712302, 754407305456136, 08584304802870446, 395335544900401, 9741322341575711 result, different first party: 15735466354712302, 754407305456136, 08584304802870446, 395335544900401, 9741322341575711 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: 1458159378665782, 7303105714974314, 11869949294670779, 09294938326809099, 6613991249976692 result, different first party: Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 5051741209115699, 5175000284092457, 9236194505946664, 6904678086486224, 29466255338125413 result, different first party: 5051741209115699, 5175000284092457, 9236194505946664, 6904678086486224, 29466255338125413 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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 6642762375028655, 29072791860872127, 371271143613388, 5514135089021217, 7001780012277152 result, different first party: 6642762375028655, 29072791860872127, 371271143613388, 5514135089021217, 7001780012277152 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: 20684572967879644, 759770464698446, 7412408321512305, 741909783031248, 6407631203562769 result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { 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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: Error: can't access property "register", navigator.serviceWorker is undefined, Error: can't access property "register", navigator.serviceWorker is undefined, Error: can't access property "register", navigator.serviceWorker is undefined, Error: can't access property "register", navigator.serviceWorker is undefined, Error: can't access property "register", navigator.serviceWorker is undefined result, different first party: Error: can't access property "register", navigator.serviceWorker is undefined, Error: can't access property "register", navigator.serviceWorker is undefined, Error: can't access property "register", navigator.serviceWorker is undefined, Error: can't access property "register", navigator.serviceWorker is undefined, Error: can't access property "register", navigator.serviceWorker is undefined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: 0462762386230644, 6609588444122321, 14587670668084574, 8343579221531183, 2625672294355368 result, different first party: 0462762386230644, 6609588444122321, 14587670668084574, 8343579221531183, 2625672294355368 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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 35322750436113504, 5330011834456887, 6082993677674675 result, different first party: Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker. unsupported: false, false, false passed: true, true, true test failed: false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: 00548013659703539, 6260153467422676, 6907139982396924, 04362483501154468, 34768014041293727 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 05819875312382128, 27268463489907524, 37720549958527605, 6162948329541207, 4899738083411713 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined result, different first party: Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: 03274950019919909, 9912040585766195, 4956085887910038, 8495330404476764, 27862071527526955 result, different first party: 03274950019919909, 9912040585766195, 4956085887910038, 8495330404476764, 27862071527526955 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: 9444894570301396, 05960015997544188, 6228557228915423, 03048266902522534, 5938827557769772 result, different first party: Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
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: 8576691694999916, 2267945238435487, 020218253580662093, 06851619724054703, 40917841721759074 result, different first party: Error: undefined, Error: undefined, Error: undefined, Error: undefined, Error: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: 7710601553830287, 14973016969864905, 34117962807378066, 320062400533317, 8871591746189611 result, different first party: Error: undefined, Error: undefined, Error: undefined, Error: undefined, Error: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: 9666089426101159, 8302718219336052, 3712505204834988, 8309447967898387, 41381580536465457 result, different first party: Error: undefined, Error: undefined, Error: undefined, Error: undefined, Error: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 result, different first party: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 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: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 result, different first party: Error: undefined, Error: undefined, Error: undefined, Error: undefined, Error: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 result, different first party: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 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: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 result, different first party: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 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: 10537561493705905, 5049605471524656, 8591626552078637, 2483500649498751, 8681560432597817 result, different first party: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: 28359830378062045, 03378240204446992, 014310536075349267, 4649319669418428, 9866423964914195 result, different first party: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 result, different first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 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: 44470298708110456, 10785576441071254, 38939346876549585 result, different first party: Error: undefined, Error: undefined, Error: undefined unsupported: false, false, false passed: true, true, true test failed: false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker result, different first party: Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker result, different first party: Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: 05583988147739816, 36516184055995526, 17483118622412652, 4384437278079143, 07108491630590397 result, different first party: Error: undefined, Error: undefined, Error: undefined, Error: undefined, Error: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 result, different first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 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: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 result, different first party: Error: undefined, Error: undefined, Error: undefined, Error: undefined, Error: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
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: 733035ad5af7bcbf87d30990025e03da9393c9c1ee467b59df64e2597cb52e09, 73752b452c39452513f81b1a0aeb1e888f110a6ab747da309a8fbc9844e3115b, a1c024cfd7209e25831f8b53a1aa715f4a9bfcc42d9598ad4db2d28e1aa65b13, 4e3479419032a0a5a7c4dc83a2368cfabf4cef948e198ff176f1e5b48d1a889b, 0789d0065634857744afd1b7b0b24b95addddf1de5a38fc947109cb6998da60f result, different first party: 043079c33343483c879670862edb0ba16bd425cfa679059e20f58bb95ff5536a, 0430ec8066233cc43c59fae2988308a5e2236126918cbd5fbf75bb1e79e89ef6, 0430a8b34ecc1b0237de283276dd32fa72822bc4a3662bc6ca006b66b1fd9d1c, 04301d25fdb8b95764ab107ffaf1e5ac3b7647879e0aaad52763c7ae29e2a1a5, 0430abd72ef9f4d52eacb40ae48670c203017728f843127baaaf466a934725c8 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: ab3a0b4df69e71c90bbc817f718a49ebe8495d1c18e85d6b2e944531a6cd6639, 3223157ee96862b99994771c47cc335a36273b1987a8d235206ae650de4fee10, e2cf8c0a0dae67174c74aa2d279ab446625376bfec66eda446ab7312fe187108, 73e57b55762a7de67caac73ee028b4e5cd7a48b9b1feda3bfd14772908ab9c85, fd31e78e656a9cc84848cc425d661d40567a730e365268e3f7d69e89dc1eb427 result, different first party: 0430e91f08ddf07ed686d4f450e70958196f9ccc9b6b21fe4cf2c3d863a2cd14, 0430d2476dab97f3770f49858a553939155d582dcee791d24746ece3f9823789, 0430af9e29cd24ab9ef641368f0539238f5ac1e8351b260ca52eafc2b1bcac2b, 04304ce02c908f3e1a95a4d2f1e4ac33337949d2d029fdfc1fa71aa964407956, 0430aece0f458f1379d4ca4c969cd1224435c37ca0e3954680c3cbd6f34ec100 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: 304888cdfe2d71c8d0c2822f4cc7fee34f858f6e63468ccc21a6b70ec9558ef9, 967b82abe301cf0ea4240e28a84e2f02aa01750aeedb3d5441afc99a3b27f9a8, f38d62e8f3000d395ed8066e33b9509485aa32eea1b5ab583c5b9e50d27bbe62, 55bed93f3bca455efa2b6a375e6d13aa304935e0a4618e9a9f6abdf7d73cfc8d, 13ee724a38345b5a36e0f981136b8476b0e54441fedbbe3e5c539da8462621aa result, different first party: 0430276febb1b851e6f978f986417450d3197abd210662c3053f9fbec19f8578, 04302d3b3598c8a875344fb7be01f7a9872b63ad0c72ae67631074bbd91321a9, 0430b9fd11a8a753caedf9653bd75f2e4c69de93f1bedda877776e1731ecf758, 0430fd1457fbe66acb8da65d40ff8a1f7956e5dd33d05c0aaf3827e0a2b9d3c9, 0430221f2faf670bec4608495e1ca4a509e7ac42a85691b61cc41f9803e950d5 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: 035fb761865f409e7505bf4e56d0a046d06101e8cc8d775baf6c7d829c5e4063, ab99721ff1624e73ad063945ce225503f035d89f579d8c96131f89d6a47d3cdb, db657dac10eaf617f16746fb8600b11eef1b186d73908f2ace669bae386e5104, 87bfd308db5ef692b419f15aaa2f6eaa72e8766d27b2961a3a222e788a9ac1e9, a48a096220a927d57edcba8cb3035f1c9fd39afbefccb9d2f290908c0902cfc1 result, different first party: 4b15b227d1f3bd4ead40c0196c0cf988217b85a7dccf6dc56caa32f3919656ab, a310ba5672b760764d04257053ec1a30463128f890c728b912432a74aaca426f, 98a0baed9a1c4604933dea641929bc7ed87fd762ea6409293c42344e5b48b9fd, 9565916bce17db00fb59a9e8e3add0b0c67b886333caa6762d0ed62a6d35d684, 4811d2f8f3920ad7de8afcfdedeb6669c9767488240ae500ff066e4c177e6f39 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: 74f557f690ce361a2c74b43e28aa91c4f5f73d6981ed5d1d247478d68c811016, 636162160a193ac0433b5c4950eec3c966faad05d1adb85052870ecd39b997bb, d65cd402da325e8434d40a7b788b404e145facd3169da2e4877195feec078e6f, 07266a53942fa26b55c72a6a0f2980c738a81ad2ba7b32dd6eb10d258c08ec9e, 83d0c0a4418f860bf3385a6a1c7bdb2b04860af34a3ff2f0cf24cca820c7b9e8 result, different first party: 08c408600111445fd534c005132125bd6d4b952d6f8dfea6246b756845f77f96, ab0b9f0abb2b426cab8995d8598e86789ab7258bbed91d8307a69ace1ca8bcbc, f25f49d809f7f46e329e006dfe78584a97d10313f812b2ecb02172f90697570c, c3577d42c0199b2538539c174a6e0cee25904e37a328182d3bb7cd956e67dc37, 9ed5e418f955a1921477e94787c19987730a1e4a790288d57fae0c392f78d67a 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: 40bdb23e34d9143e43db120cb9afd0eda7a58ba432b019e3d2a986760bbf3c64, 3c90d1707bced6776490d2cdf87e33d2bcc234ba5d6ef0aed345272d389c6b13, 497410a985833cc424bc0edce0455274eada42deae3d9d7758bad2f888f87952, a22c5ed4b5db8c3f623a4787102e006c3271d49b69f6eb575310fc16df0db54d, f8d31c7dfdd7ba6c1681b0e57b5d3db08eebedb4dd0c1960fb074d1f1246c116 result, different first party: 9b1bfc2f3282a3e359af09a06a60175d34bda31da0b5d4725b0abc405a5383f2, 8210fe35bf7d31ecd6fd3891968cc6fa378df814676f77399a8f419d8183710d, a7886824152edc205af9fd2bd36f67574144a7dcfcd5b1cafa6e9ea43a19cd1b, dd640b3a6daa5169065e9d5c2db4ea7640ee0fd88b575293fa67b6561c64215b, 243490ed9b0584a4306c5df2fc3172935b13a15c709215bc73eb1a0c24dbca54 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: 536fca83895d9f2b80ddef76200cb33c1a6ffb07e0a8d8392ae90889a4c923da, 6f986e2ae8bcfd5486a02178ba51b6c99b5c9563c4cdbe6450a818f20fbac98e, 593c75207ff92e1ba089cfb8193a75a7fdf3c098254e26bca4bf49d89efe5774, ae3cb58433b8554edff8f06ef859ba5a3acdc60103326f2f4cb9748f7e95a6a9, a9dd292d9f182a1c5c5ec3b90ac1abe94513ba8df585c1a196447b82c70d636e result, different first party: 7715f7428e153745282a275a56460c28e88c568217f33ebf60e220d65cc036f2, 8d9ae5616510cc60245548980376b2f71cf3f008a02cba9191a9c8eedd26952b, 7596ae25fe6db2b2279ece867ca768cd90e467a544c83f79a37ebaf451268b49, 294ddac91354e87efd384d5389ff74934c7d3ba8c40e45d0c5aea0ddc483faaf, 01735f30687312647d47554f28d6a025431f6afc319326e3038a6574bb7c5eb5 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: fcd638706a73ae6ebba53a3eba00e9774d3ab4fabfcfe47623c35a1db01d6b26, c656ac0b22c634a835dc74e798ac2186ae32d1d89a4f6cf7812ede1a3888421f, 56e2316bc6a02a79c177d8d3b7c3a20674761092baeaeffa3408ec8aaa227618, 21cf0e76c495f988392014dcdc080eb059cf519b08652ebdf065769ad4e3e981, 4ccfe4276ed7bfe35d4b4254607d4b8069e619505fc2c9c1196afb2f2765ac34 result, different first party: 0430fc0dc8c0248c9df33a617795ec0e92e64200bc0a054b76ab1b41b9a3511a, 04302e81d6b11906f22b32b2fd0824e53aff158cf3a2ec407d56513dbad09f64, 0430c7c61b0fa395640113b34890d21dfc2af335a937db536610d413f6d88137, 0430b099c6406c118990376cd7d80f314eff52bb76f2f82168149456211c6193, 0430d4fa6e92a5a08877bc111a018ba6087fcdd22ca613c263f7163f21b796d5 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: 5e7b900f9048eb740dacd46a228c49cb0189263aa47141c51981931ac24d8294, 7d9c039cd0c62e600ca0cc496e936b48cdc2fa3975a58d549a3dbb0963f810e4, 20971dcb3068bac6166cbafc609f799844eff113a094c9db3717b33dc7c3f48d, d27fa1ec37cbf86f95b489e0b3c50470f0ae6a5e408c9f5a15d773cb231a86e5, 7f35a6e8f9d1f66538ecd99550c696821eae0dc99a6db18420cf1e1d61d22648 result, different first party: c3784a176afdf006ce14e6d4f2840002a12d86b705b8b6d35fe295133c947f9e, cd046290d1c56c18b9d259ff8bd08c767e087e67161ccba9befe89e5e1fd8826, 1e704ecf1983a16af6bbc779497281ce4bba38f036e3d6cb36c15955443b5eef, e917798463c08f9fc61566aac7198892d714b96251c33fff96289b5de3b00f3f, 3b332c85b0b995f5f0f63d8ce6b8aa12207d6d79ee8eddb60629930a56d45ed3 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: c0f68c4e1b37ef141a58956b1ea77732b73a4bebe11e415216a2dbc8a25ca228, a2e23df7b06efa2e6e70aa405276e14ff39bef98ee2c23e36d7a5c2076c71027, 2f1fc3fa7455f1d7e7b762838898aec0c29638ede7b0f023e0007bdebd1f973d, a97e24d1bad137ca340683a3a1ee2fb916b8a4b086dea488d5f12e6e69f6bf8e, 37ae8c6870632c3f9fd9262482d8b28013d5d377afffc0f6e5e9f75559dfba9f result, different first party: 256def5ec45ab52cd8406f30f192e4e4a2ace56d17312eacc836cd21a2d5d366, 2037276b0b1981b9a31e0cfcb4298f260cb183cb0974875c1674421c4cd38a0d, 7f78953971e851d6b34d31a745ae94085762c7b2281758dfe058d96fc6b1288e, a3373d6691bded8331ab542f1f51b5c926665c75895e430aef18e6304d8fc828, fea7d6a19b5426f42ec0c31361b49e94e078e33d28a0fbeb12983f32dce90b4e 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: e8fcfb2b0bde786bf35407aa5a48bd0dcbe42db0684584a3a51ce631e7a71812, eff609c4f831d04f4b33e6947dca526d9d87528fb485d73bae7021af1595f1a6, e0a8263bd6f5e106e05d18ee54ccecce575a19b3397e60f62dd1f2c3745196ff result, different first party: 0ea0f1a1d65af4099d8ec301657d4aea6151a365254ca87450c0c5dc545b5d51, ae1e6b4060b612f548596b4a87bcb8ca15068ce9958d251b7ca5f9c1cab8bfad, 0ef589fe458f2846b019a2bddcccb16024a8391503855b2c22b2c7700f16659e unsupported: false, false, false passed: true, true, true test failed: 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: d67d1695b7cb687dfd615161b459a36e07ea0c9b8df5133e6845628912dbdb9b, 91fa5e655bdabbfb239cd0532909206e62dd9fd14f95dedf79e66991f0e25483, d634c0fd490087039305fba497dd12f32da4fdabb8fd3cd9b2b68ba8234b12da, 4dc32f046fa29c9f8a047844513829d6b213f673caf1ee65c91c9b7c6460d8db, e60d006df5095aa207f6c9e9c1d6f7a41c755e92955ca385971acb4b1ee73f0a result, different first party: 75eba9eb8a646d57e2e2849574477d7d3ea9c07497cb46bb469f0830e462cbfc, af79d3875949501302a207914664ae6e8b813230ff9454abe635a03629a160af, 0979f44b39f912c29ddb43d8781e14a31d9cc5c76045ff89026c6366682e221b, 1afbc0cc65c1e74d0485b797c90f9d21fe6f0b10a210f34ee450cb9b86651891, 7fea2c19f444ac94fac383eae64b21886f9114bfa40fffd0b500968cb477ac9a 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: b3649c65ddbb7f3797615e47f2b3ad405511f22c127e179647d9ad5e4b81138a, 59086582975cdfced36cca518fa38cae62cfe352b0bdf25bd3a7a23ca7f4e3d6, 6d0923bc6b36bad84e4e237538e26e5962b1909d07bab6a287cf92b42fcf2616, fa896b0522c1d067016726db93ecd1287395594576d712bbed09612ec1c0eb2a, 65219edb4a89c45093f9704fa8c71558fa885ee6cf52e84d72d7ded4883c25e4 result, different first party: c2a6c789e7c3c618da692dc8414871395c285a3bf96e4ba8774316784c774804, 699baf8ea3cd6ac18d5d4a44ac3e828d22a1164cdfb7f45de9908607e1290013, 0764d586f111080cd4b414287248efce01c57cf561db93452b62db85973f1f3e, 47143a4d3cf2752757f710dcfeffbd94abf382d8623b45422d3500bba643c09a, 44b7153cfd4d9525b4034d868dcdab2551dd2b02f2fa8532229cbbf42b18d34b 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: 6cf970c1669496e94c00ea194fdb91a5de6a73cbe3b8b2653946dcac70c9fe1e, f2d55692ddaedd4e03c749bd6b0d7f24e9780e4c334487c455f148df6ce15fc5, 624c113d592cbb7248f60f4ce421af220787b2d37694fe037c17baf43a60f828, b5e72b791171bc8737e0a547eb9b50e0f0f417451508a145b7adc1eeb4989597, 36c9513d0e9057877955e810f63833cbd37ac10be2f8a91e537a42cb5af4a836 result, different first party: 87245d7be395111d28b7a1c2b55c526f22b218378e231f5d2f7851ee164a6aba, 489f1e6b456b5b64463b86038282f518ca03de91bbb4fba0387ff19c7395c9e9, ef5fc15c853ee2cde8a9869f69c8157c59c5349d2fff210b728641fa845d50ed, cf99ab8fcf013b734600944f752088ad17b42d8e4d42e8161a340643f5b78dde, 12985f957813b7263f2237c8169ded7abfd68814781654ad39cba0673d4a4fbe 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: 442a30f7970209190b64d04f4c6bf4b862455ddd066ac91285251e96b65365f2, c416872c1d386a7434b36ff7a0d20a2dec0bf700652df8c6588b357fb049f286, f875219a53ee192a3df7034703f43c9cc3d567bba8e3cf5b7a260c7848dbd232, 4abc77f2fc4bb1d0af5071ed8d95d490f4ed86718547fb0f7c836092ff5c5650, 9e2917b8acf714982e52ebfeedfa1de635e2713cec713eab39c4a7221e84d880 result, different first party: a4c08e05b4a36ba2f378528e55e6a1491c0b85714de8451647a4826c2ca2d399, 36a9350e3625fa29f31fb36f56af3b454e4bade04b346f58be2a52ac5c5f7c8a, dc515b6ce09cb22d3ccad7d2b49e0575109c2ac8d510d2940368a85122d17bb9, a53d5028286e73beb3ce5502c27f5bedb4db0b58f1d1998eda9fb350d1fe2a3d, 515d229d11d79f3b1851750846538bf101acaf9b038fafd1d753c7b3d9babe8b 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: 62a4a884d508bc81a507208048c31c0e69753e427404d202960a50695ba03d5a, d93f2587162dd25b4d9168fbe0e5f967acb026df7adf3cdc66ac5fc2cfbcd4ea, 2c3bf80501eb404aea811d5ab92ef21b2d444610efdca3c09a2e11f7ee33b23a, e9502286445a09020ebb22a3217a4d09a6145ae5f6d65a16f431f1653fef22bb, 5b5dded065d40a9b5d183db06195257dac30db8aba80a36c7babfd9bea77e795 result, different first party: 24dfdce6b64bd6652da4392dade958a5f6d7708e8b59339e8c3318edf661e00d, 5238cacdc2fae046ff5809842eec43b4d3a66da29e393027548e978b7e818faf, 3d164e6ff9f448fadf5077cb6a48622b281e11cfdcaf6e650e73b6a8f22822ae, 02b3d63b743731119a709c2f12b238b69723a2084d5301d9bc63cc06a3892ba4, e9aa72248aa18db57bb1df04f45e7b550a6abad469b2dcfc870be50fbd3bd99c unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
Web SQL DatabaseThe Web SQL Database is a deprecated web API for storing data in an SQL database.
  write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: 43083921537220315, 2267945238435487, 020218253580662093, 06851619724054703, 40917841721759074 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) => { 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: 7710601553830287, 14973016969864905, 34117962807378066, 320062400533317, 8871591746189611 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) => { 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: 9666089426101159, 8302718219336052, 3712505204834988, 8309447967898387, 41381580536465457 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) => { 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: 13997713246567955, 9226422016777616, 5140476791250266, 08480281890827235, 7126660270217995 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: 6539437035590541, 8256533769335648, 5262969884636959, 3343148198916508, 3352387264043457 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: 23169535587436862, 9962936518440524, 009165158103347393, 28044477926194955, 28967003372496625 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: 11264539727554124, 08097760907873108, 8994790318040324, 47601545952339697, 34212445759605137 result, different first party: Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function result, different first party: Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function result, different first party: Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: 0049001580876166795, 6729656479080388, 4086542196245486, 0370036934754141, 9545551655343605 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: 44470298708110456, 10785576441071254, 38939346876549585 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. unsupported: false, false, false passed: true, true, true test failed: false, false, false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated result, different first party: Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated result, different first party: Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function result, different first party: Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 result, different first party: 031242629491124774, 736050217533283, 12017031730538763, 45929301499337716, 9850082882429967 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: 3656619922251714, 9880917810312053, 27528881272088235, 6533957356471252, 6067500398957231 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
XMLHttpRequest cacheSimilar to the newer Fetch API, any resource received may be cached by the browser. The cache is potentially vulnerable to cross-site tracking attack.
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 18:28:01 GMT, Tue, 09 Nov 2021 18:28:49 GMT, Tue, 09 Nov 2021 18:29:33 GMT, Tue, 09 Nov 2021 18:30:17 GMT, Tue, 09 Nov 2021 18:31:02 GMT result, different first party: Mon, 08 Nov 2021 01:12:56 GMT, Mon, 08 Nov 2021 01:12:56 GMT, Mon, 08 Nov 2021 01:12:56 GMT, Mon, 08 Nov 2021 01:12:56 GMT, Mon, 08 Nov 2021 01:12:56 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 18:31:46 GMT, Tue, 09 Nov 2021 18:32:33 GMT, Tue, 09 Nov 2021 18:33:20 GMT, Tue, 09 Nov 2021 18:34:05 GMT, Tue, 09 Nov 2021 18:34:50 GMT result, different first party: Tue, 09 Nov 2021 18:32:00 GMT, Tue, 09 Nov 2021 18:32:46 GMT, Tue, 09 Nov 2021 18:33:33 GMT, Tue, 09 Nov 2021 18:34:18 GMT, Tue, 09 Nov 2021 18:35:03 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 18:35:49 GMT, Tue, 09 Nov 2021 18:38:26 GMT, Tue, 09 Nov 2021 18:41:02 GMT, Tue, 09 Nov 2021 18:44:09 GMT, Tue, 09 Nov 2021 18:46:27 GMT result, different first party: Tue, 09 Nov 2021 18:36:52 GMT, Tue, 09 Nov 2021 18:39:38 GMT, Tue, 09 Nov 2021 18:42:14 GMT, Tue, 09 Nov 2021 18:45:00 GMT, Tue, 09 Nov 2021 18:47:28 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 18:55:29 GMT, Tue, 09 Nov 2021 18:56:08 GMT, Tue, 09 Nov 2021 18:56:45 GMT, Tue, 09 Nov 2021 18:57:23 GMT, Tue, 09 Nov 2021 18:57:59 GMT result, different first party: Mon, 08 Nov 2021 03:15:05 GMT, Mon, 08 Nov 2021 03:15:05 GMT, Mon, 08 Nov 2021 03:15:05 GMT, Mon, 08 Nov 2021 03:15:05 GMT, Mon, 08 Nov 2021 03:15:05 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 18:58:37 GMT, Tue, 09 Nov 2021 18:59:15 GMT, Tue, 09 Nov 2021 18:59:53 GMT, Tue, 09 Nov 2021 19:00:34 GMT, Tue, 09 Nov 2021 19:01:13 GMT result, different first party: Tue, 09 Nov 2021 18:58:45 GMT, Tue, 09 Nov 2021 18:59:23 GMT, Tue, 09 Nov 2021 19:00:03 GMT, Tue, 09 Nov 2021 19:00:42 GMT, Tue, 09 Nov 2021 19:01:21 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 19:01:52 GMT, Tue, 09 Nov 2021 19:02:34 GMT, Tue, 09 Nov 2021 19:03:14 GMT, Tue, 09 Nov 2021 19:03:55 GMT, Tue, 09 Nov 2021 19:04:40 GMT result, different first party: Tue, 09 Nov 2021 09:45:17 GMT, Tue, 09 Nov 2021 09:45:17 GMT, Tue, 09 Nov 2021 09:45:17 GMT, Tue, 09 Nov 2021 09:45:17 GMT, Tue, 09 Nov 2021 09:45:17 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 19:05:18 GMT, Tue, 09 Nov 2021 19:05:57 GMT, Tue, 09 Nov 2021 19:06:36 GMT, Tue, 09 Nov 2021 19:07:13 GMT, Tue, 09 Nov 2021 19:07:51 GMT result, different first party: Tue, 09 Nov 2021 19:05:26 GMT, Tue, 09 Nov 2021 19:06:05 GMT, Tue, 09 Nov 2021 19:06:44 GMT, Tue, 09 Nov 2021 19:07:21 GMT, Tue, 09 Nov 2021 19:08:00 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 18:48:51 GMT, Tue, 09 Nov 2021 18:49:34 GMT, Tue, 09 Nov 2021 18:50:15 GMT, Tue, 09 Nov 2021 18:50:55 GMT, Tue, 09 Nov 2021 18:51:34 GMT result, different first party: Tue, 09 Nov 2021 18:10:53 GMT, Tue, 09 Nov 2021 18:10:53 GMT, Tue, 09 Nov 2021 18:10:53 GMT, Tue, 09 Nov 2021 18:10:53 GMT, Tue, 09 Nov 2021 18:10:53 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 18:52:12 GMT, Tue, 09 Nov 2021 18:52:54 GMT, Tue, 09 Nov 2021 18:53:32 GMT, Tue, 09 Nov 2021 18:54:11 GMT, Tue, 09 Nov 2021 18:54:50 GMT result, different first party: Tue, 09 Nov 2021 18:52:25 GMT, Tue, 09 Nov 2021 18:53:04 GMT, Tue, 09 Nov 2021 18:53:43 GMT, Tue, 09 Nov 2021 18:54:23 GMT, Tue, 09 Nov 2021 18:55:02 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 19:08:35 GMT, Tue, 09 Nov 2021 19:09:22 GMT, Tue, 09 Nov 2021 19:10:09 GMT, Tue, 09 Nov 2021 19:10:56 GMT, Tue, 09 Nov 2021 19:11:41 GMT result, different first party: Mon, 08 Nov 2021 03:40:09 GMT, Mon, 08 Nov 2021 03:40:09 GMT, Mon, 08 Nov 2021 03:40:09 GMT, Mon, 08 Nov 2021 03:40:09 GMT, Mon, 08 Nov 2021 03:40:09 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 19:12:31 GMT, Tue, 09 Nov 2021 19:19:22 GMT, Tue, 09 Nov 2021 19:26:12 GMT result, different first party: Tue, 09 Nov 2021 19:12:45 GMT, Tue, 09 Nov 2021 19:19:35 GMT, Tue, 09 Nov 2021 19:26:24 GMT unsupported: false, false, false passed: true, true, true test failed: false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 19:40:06 GMT, Tue, 09 Nov 2021 19:40:48 GMT, Tue, 09 Nov 2021 19:41:30 GMT, Tue, 09 Nov 2021 19:42:11 GMT, Tue, 09 Nov 2021 19:42:52 GMT result, different first party: Tue, 09 Nov 2021 19:40:12 GMT, Tue, 09 Nov 2021 19:40:55 GMT, Tue, 09 Nov 2021 19:41:36 GMT, Tue, 09 Nov 2021 19:42:17 GMT, Tue, 09 Nov 2021 19:42:58 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 19:43:35 GMT, Tue, 09 Nov 2021 19:44:15 GMT, Tue, 09 Nov 2021 19:44:55 GMT, Tue, 09 Nov 2021 19:45:36 GMT, Tue, 09 Nov 2021 19:46:16 GMT result, different first party: Tue, 09 Nov 2021 19:43:41 GMT, Tue, 09 Nov 2021 19:44:21 GMT, Tue, 09 Nov 2021 19:45:02 GMT, Tue, 09 Nov 2021 19:45:42 GMT, Tue, 09 Nov 2021 19:46:23 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 18:12:02 GMT, Tue, 09 Nov 2021 18:15:17 GMT, Tue, 09 Nov 2021 18:18:47 GMT, Tue, 09 Nov 2021 18:22:16 GMT, Tue, 09 Nov 2021 18:25:02 GMT result, different first party: Tue, 09 Nov 2021 18:13:17 GMT, Tue, 09 Nov 2021 18:16:35 GMT, Tue, 09 Nov 2021 18:19:59 GMT, Tue, 09 Nov 2021 18:23:20 GMT, Tue, 09 Nov 2021 18:26:15 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 19:28:12 GMT, Tue, 09 Nov 2021 19:29:22 GMT, Tue, 09 Nov 2021 19:30:34 GMT, Tue, 09 Nov 2021 19:31:45 GMT, Tue, 09 Nov 2021 19:32:54 GMT result, different first party: Mon, 08 Nov 2021 03:59:15 GMT, Mon, 08 Nov 2021 03:59:15 GMT, Mon, 08 Nov 2021 03:59:15 GMT, Mon, 08 Nov 2021 03:59:15 GMT, Mon, 08 Nov 2021 03:59:15 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( {"secret": xhr.getResponseHeader("date")})); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "no-cache"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) read: () => new Promise((resolve, reject) => { let xhr = new XMLHttpRequest(); xhr.addEventListener("load", () => resolve( xhr.getResponseHeader("date"))); xhr.open("GET", "https://arthuredelstein.net"); xhr.setRequestHeader("Cache-Control", "max-age"); xhr.send(); setTimeout(() => reject({message: "XHR: no response"}), 3000); }) result, same first party: Tue, 09 Nov 2021 19:34:04 GMT, Tue, 09 Nov 2021 19:35:15 GMT, Tue, 09 Nov 2021 19:36:29 GMT, Tue, 09 Nov 2021 19:37:46 GMT, Tue, 09 Nov 2021 19:39:00 GMT result, different first party: Tue, 09 Nov 2021 19:34:15 GMT, Tue, 09 Nov 2021 19:35:26 GMT, Tue, 09 Nov 2021 19:36:44 GMT, Tue, 09 Nov 2021 19:37:58 GMT, Tue, 09 Nov 2021 19:39:15 GMT unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
Navigation testsWhen you click a hyperlink to navigate your browser from one site to another, certain browser APIs allow the first site to communicate to the second site. These privacy vulnerabilities can be fixed by introducing new limits on how much data is transfered between sites.
document.referrerThe Referer [sic] request header is a mechanism used by browsers to let a website know where the user is visiting from. This header is inherently tracking users across websites. In recent times, browsers have switched to a policy of trimming a referrer to convey less tracking information, but Referer continues to convey cross-site tracking data by default.
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  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
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
sessionStorageThe sessionStorage API is similar to the localStorage API, but it does not persist across tabs or across browser sessions. Nonetheless, it can be used to track users if they navigate from one website to another. This tracking can be thwarted by partitioning sessionStorage between websites.
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 08954629993587115, 8650413234558787, 5351844227521672, 3105869608430729, 06461716029786513 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: 7168053110455261, 8017961726436773, 25898583576712886, 18496184722130482, 46652887231444873 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: 0874054298221214, 8772660708267592, 67781738709359, 9454382010485651, 19993177914009674 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: 15735466354712302, 754407305456136, 08584304802870446, 395335544900401, 9741322341575711 result, different first party: 15735466354712302, 754407305456136, 08584304802870446, 395335544900401, 9741322341575711 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: 1458159378665782, 7303105714974314, 11869949294670779, 09294938326809099, 6613991249976692 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: 5051741209115699, 5175000284092457, 9236194505946664, 6904678086486224, 29466255338125413 result, different first party: 5051741209115699, 5175000284092457, 9236194505946664, 6904678086486224, 29466255338125413 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: 6642762375028655, 29072791860872127, 371271143613388, 5514135089021217, 7001780012277152 result, different first party: 6642762375028655, 29072791860872127, 371271143613388, 5514135089021217, 7001780012277152 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: 20684572967879644, 759770464698446, 7412408321512305, 741909783031248, 6407631203562769 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: 600458593236846, 8027211461226333, 6598380951384508, 1259771049297571, 9599459884283184 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: 0462762386230644, 6609588444122321, 14587670668084574, 8343579221531183, 2625672294355368 result, different first party: 0462762386230644, 6609588444122321, 14587670668084574, 8343579221531183, 2625672294355368 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: 35322750436113504, 5330011834456887, 6082993677674675 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. unsupported: false, false, false passed: true, true, true test failed: false, false, false
  write: (secret) => sessionStorage.setItem("secret", secret) read: () => sessionStorage.getItem("secret") result, same first party: 00548013659703539, 6260153467422676, 6907139982396924, 04362483501154468, 34768014041293727 result, different first party: 00548013659703539, 6260153467422676, 6907139982396924, 04362483501154468, 34768014041293727 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: 05819875312382128, 27268463489907524, 37720549958527605, 6162948329541207, 4899738083411713 result, different first party: 05819875312382128, 27268463489907524, 37720549958527605, 6162948329541207, 4899738083411713 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: 8724565791798655, 4092029625925864, 08665552338979521, 38827155775628674, 5697141354318933 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: 03274950019919909, 9912040585766195, 4956085887910038, 8495330404476764, 27862071527526955 result, different first party: 03274950019919909, 9912040585766195, 4956085887910038, 8495330404476764, 27862071527526955 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: 9444894570301396, 05960015997544188, 6228557228915423, 03048266902522534, 5938827557769772 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
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: 08954629993587115, 8650413234558787, 5351844227521672, 3105869608430729, 06461716029786513 result, different first party: 08954629993587115, 8650413234558787, 5351844227521672, 3105869608430729, 06461716029786513 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: 7168053110455261, 8017961726436773, 25898583576712886, 18496184722130482, 46652887231444873 result, different first party: 7168053110455261, 8017961726436773, 25898583576712886, 18496184722130482, 46652887231444873 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: 0874054298221214, 8772660708267592, 67781738709359, 9454382010485651, 19993177914009674 result, different first party: 0874054298221214, 8772660708267592, 67781738709359, 9454382010485651, 19993177914009674 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: 15735466354712302, 754407305456136, 08584304802870446, 395335544900401, 9741322341575711 result, different first party: 15735466354712302, 754407305456136, 08584304802870446, 395335544900401, 9741322341575711 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: 1458159378665782, 7303105714974314, 11869949294670779, 09294938326809099, 6613991249976692 result, different first party: 1458159378665782, 7303105714974314, 11869949294670779, 09294938326809099, 6613991249976692 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: 5051741209115699, 5175000284092457, 9236194505946664, 6904678086486224, 29466255338125413 result, different first party: 5051741209115699, 5175000284092457, 9236194505946664, 6904678086486224, 29466255338125413 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: 6642762375028655, 29072791860872127, 371271143613388, 5514135089021217, 7001780012277152 result, different first party: 6642762375028655, 29072791860872127, 371271143613388, 5514135089021217, 7001780012277152 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: 20684572967879644, 759770464698446, 7412408321512305, 741909783031248, 6407631203562769 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 600458593236846, 8027211461226333, 6598380951384508, 1259771049297571, 9599459884283184 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 0462762386230644, 6609588444122321, 14587670668084574, 8343579221531183, 2625672294355368 result, different first party: 0462762386230644, 6609588444122321, 14587670668084574, 8343579221531183, 2625672294355368 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: 35322750436113504, 5330011834456887, 6082993677674675 result, different first party: 35322750436113504, 5330011834456887, 6082993677674675 unsupported: false, false, false passed: false, false, false test failed: 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: 00548013659703539, 6260153467422676, 6907139982396924, 04362483501154468, 34768014041293727 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 05819875312382128, 27268463489907524, 37720549958527605, 6162948329541207, 4899738083411713 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 8724565791798655, 4092029625925864, 08665552338979521, 38827155775628674, 5697141354318933 result, different first party: 8724565791798655, 4092029625925864, 08665552338979521, 38827155775628674, 5697141354318933 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: 03274950019919909, 9912040585766195, 4956085887910038, 8495330404476764, 27862071527526955 result, different first party: 03274950019919909, 9912040585766195, 4956085887910038, 8495330404476764, 27862071527526955 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: 9444894570301396, 05960015997544188, 6228557228915423, 03048266902522534, 5938827557769772 result, different first party: 9444894570301396, 05960015997544188, 6228557228915423, 03048266902522534, 5938827557769772 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
HTTPS testsHTTPS is the protocol that web browsers use to connect securely to websites. When HTTPS is being used, the connection is encrypted so that third parties on the network cannot read content being sent between the server and your browser. In the past, insecure connections were the default and websites would need to actively request that a browser use HTTPS. Now the status quo is shifting, and browser makers are moving toward a world where HTTPS is the default protocol.
Insecure websiteChecks to see if the browser stops loading an insecure website and warns the user before giving them the option to continue. Known as HTTPS-Only Mode in some browsers.
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  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,true result: Insecure website loaded,Insecure website 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,true result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website 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
Upgradable addressChecks to see if an insecure address entered into the browser's address bar is upgraded to HTTPS whenever possible.
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: 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
  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,false,true,true passed: true,true,false,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
Upgradable hyperlinkChecks to see if the user has clicked on a hyperlink to an insecure address, if the browser upgrades that address to HTTPS whenever possible.
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: 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
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
Upgradable imageChecks to see if the browser attempts to upgrade an insecure address for an image to HTTPS whenever possible.
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: 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: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: false,false,false,false,false result: loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely
  passed: false,false,false,false,false result: loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true result: upgraded,upgraded,upgraded
  passed: false,false,false,false,false result: loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely
  passed: false,false,false,false,false result: loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely
  passed: false,false,false,false,false result: loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
Upgradable scriptChecks to see if the browser attempts to upgrade an insecure address for an script to HTTPS whenever possible.
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: 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
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
Misc testsThis category includes tests for the presence of miscellaneous privacy features.
GPC enabledThe 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.
  sec-gpc: 1 passed: true,true,true,true,true
  sec-gpc: 1 passed: true,true,true,true,true
  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
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
IP address leakIP addresses can be used to uniquely identify a large percentage of users. A proxy, VPN, or Tor can mask a user's IP address.
  IP addressed masked: false passed: false,false,false,false,false
  IP addressed masked: false passed: false,false,false,false,false
  IP addressed masked: true passed: true,true,true,true,true
  IP addressed masked: false passed: false,false,false,false,false
  IP addressed masked: false passed: false,false,false,false,false
  IP addressed masked: false passed: false,false,false,false,false
  IP addressed masked: false passed: false,false,false,false,false
  IP addressed masked: false passed: false,false,false,false,false
  IP addressed masked: false passed: false,false,false,false,false
  IP addressed masked: false passed: false,false,false,false,false
  IP addressed masked: false passed: false,false,false
  IP addressed masked: false passed: false,false,false,false,false
  IP addressed masked: false passed: false,false,false,false,false
  IP addressed masked: true passed: true,true,true,true,true
  IP addressed masked: false passed: false,false,false,false,false
  IP addressed masked: false passed: false,false,false,false,false
Stream isolationBrowsers that use Tor can use a different Tor circuit per top-level website.
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
  write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: false,false,false,false,false readSameFirstParty: 213.164.204.116,205.185.114.229,5.2.69.50,5.2.72.226,185.220.101.3 readDifferentFirstParty: 213.164.204.116,205.185.114.229,5.2.69.50,5.2.72.226,185.220.101.3 passed: false,false,false,false,false 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: true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
  write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: false,false,false,false,false readSameFirstParty: 2a01:4262:1ab:ffff::131,2a0b:f4c0:16c:15::1,2a0b:f4c0:16c:16::1,2a0b:f4c2:2::54,185.100.87.202 readDifferentFirstParty: 2620:18c:0:192::218,2a02:c207:3002:8283::1,91.203.145.116,2605:6400:10:b92:12e2:729e:25cc:58cd,2a0b:f4c0:16c:14::1 passed: true,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,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
Tor enabledThe Tor network sends the browser's web requests through a series of relays to hide a user's IP address, thereby helping to mask their identity and location. This test checks to see if the Tor network is being used by default.
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: true,true,true,true,true passed: true,true,true,true,true
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  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 passed: false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: true,true,true,true,true passed: true,true,true,true,true
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
Fingerprinting resistance testsFingerprinting is a technique trackers use to uniquely identify you as you browse the web. A fingerprinting script will measure several characteristics of your browser and, combining this data, will build a fingerprint that may uniquely identify you among web users. Browsers can introduce countermeasures, such as minimizing the distinguishing information disclosed by certain web APIs so your browser is harder to pick out from the crowd (so-called 'fingerprinting resistance').
Media query screen heightHeight of the user's screen in pixels.
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 898,898,898,898,898 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1211,1211,1211,1211,1211 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1211,1211,1211,1211,1211 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 894,894,894,894,894 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 894,894,894,894,894 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 894,894,894,894,894 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 894,894,894,894,894 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 983,983,983,983,983 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 983,983,983,983,983 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1256,1256,1256,1256,1256 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440 desired value: 1256,1256,1256 passed: false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 860,860,860,860,860 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 860,860,860,860,860 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1152,1152,1152,1152,1152 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1152,1152,1152,1152,1152 passed: false,false,false,false,false
Media query screen widthWidth of the user's screen in pixels.
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1920,1920,1920,1920,1920 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1920,1920,1920,1920,1920 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1280,1280,1280,1280,1280 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1280,1280,1280,1280,1280 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 2520,2520,2520,2520,2520 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560 desired value: 2520,2520,2520 passed: false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1324,1324,1324,1324,1324 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1324,1324,1324,1324,1324 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1405,1405,1405,1405,1405 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1405,1405,1405,1405,1405 passed: false,false,false,false,false
outerHeightHeight of the browser window in pixels, including browser chrome.
  expression: outerHeight desired expression: innerHeight actual value: 973,973,973,973,973 desired value: 898,898,898,898,898 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1286,1286,1286,1286,1286 desired value: 1211,1211,1211,1211,1211 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1286,1286,1286,1286,1286 desired value: 1211,1211,1211,1211,1211 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 973,973,973,973,973 desired value: 894,894,894,894,894 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 973,973,973,973,973 desired value: 894,894,894,894,894 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 973,973,973,973,973 desired value: 894,894,894,894,894 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 973,973,973,973,973 desired value: 894,894,894,894,894 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1068,1068,1068,1068,1068 desired value: 983,983,983,983,983 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1068,1068,1068,1068,1068 desired value: 983,983,983,983,983 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1330,1330,1330,1330,1330 desired value: 1256,1256,1256,1256,1256 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1330,1330,1330 desired value: 1256,1256,1256 passed: false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 940,940,940,940,940 desired value: 860,860,860,860,860 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 940,940,940,940,940 desired value: 860,860,860,860,860 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: outerHeight desired expression: innerHeight actual value: 1286,1286,1286,1286,1286 desired value: 1152,1152,1152,1152,1152 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1286,1286,1286,1286,1286 desired value: 1152,1152,1152,1152,1152 passed: false,false,false,false,false
screen.heightHeight of the user's screen, in pixels.
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 898,898,898,898,898 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1211,1211,1211,1211,1211 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1211,1211,1211,1211,1211 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 894,894,894,894,894 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 894,894,894,894,894 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 894,894,894,894,894 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 894,894,894,894,894 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 983,983,983,983,983 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 983,983,983,983,983 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1256,1256,1256,1256,1256 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440 desired value: 1256,1256,1256 passed: false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 860,860,860,860,860 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 860,860,860,860,860 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1152,1152,1152,1152,1152 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1152,1152,1152,1152,1152 passed: false,false,false,false,false
screen.widthWidth of the user's screen, in pixels.
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1920,1920,1920,1920,1920 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1920,1920,1920,1920,1920 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1280,1280,1280,1280,1280 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1280,1280,1280,1280,1280 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 2520,2520,2520,2520,2520 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560 desired value: 2520,2520,2520 passed: false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1324,1324,1324,1324,1324 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1324,1324,1324,1324,1324 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1405,1405,1405,1405,1405 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1405,1405,1405,1405,1405 passed: false,false,false,false,false
screenXPosition, in pixels, of the left edge of the browser window on screen.
  expression: screenX desired expression: 0 actual value: 95,95,95,95,95 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 22,22,22,22,22 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 22,22,22,22,22 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 22,22,22,22,22 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 22,22,22,22,22 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 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: 4,4,4,4,4 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 4,4,4,4,4 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0 desired value: 0,0,0 passed: true,true,true
  expression: screenX desired expression: 0 actual value: 1072,1072,1072,1072,1072 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 1072,1072,1072,1072,1072 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 22,22,22,22,22 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 22,22,22,22,22 desired value: 0,0,0,0,0 passed: false,false,false,false,false
screenYPosition, in pixels, of the top edge of the browser window on screen.
  expression: screenY desired expression: 0 actual value: 252,252,252,252,252 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 47,47,47,47,47 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 47,47,47,47,47 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25 desired value: 0,0,0 passed: false,false,false
  expression: screenY desired expression: 0 actual value: 145,145,145,145,145 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 145,145,145,145,145 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: 47,47,47,47,47 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 47,47,47,47,47 desired value: 0,0,0,0,0 passed: false,false,false,false,false
System font detectionWeb pages can detect the presence of a font installed on the user's system. The presence or absence of various fonts is commonly used to fingerprint users.
  expression: undefined desired expression: true actual value: false,false,false,false,false desired value: true,true,true,true,true passed: false,false,false,false,false
  expression: undefined desired expression: true actual value: false,false,false,false,false desired value: true,true,true,true,true passed: false,false,false,false,false
  expression: undefined desired expression: true actual value: false,false,false,false,false desired value: true,true,true,true,true passed: false,false,false,false,false
  expression: undefined desired expression: true actual value: false,false,false,false,false desired value: true,true,true,true,true passed: false,false,false,false,false
  expression: undefined desired expression: true actual value: false,false,false,false,false desired value: true,true,true,true,true passed: false,false,false,false,false
  expression: undefined desired expression: true actual value: false,false,false,false,false desired value: true,true,true,true,true passed: false,false,false,false,false
  expression: undefined desired expression: true actual value: false,false,false,false,false desired value: true,true,true,true,true passed: false,false,false,false,false
  expression: undefined desired expression: true actual value: false,false,false,false,false desired value: true,true,true,true,true passed: false,false,false,false,false
  expression: undefined desired expression: true actual value: false,false,false,false,false desired value: true,true,true,true,true passed: false,false,false,false,false
  expression: undefined desired expression: true actual value: false,false,false,false,false desired value: true,true,true,true,true passed: false,false,false,false,false
  expression: undefined desired expression: true actual value: false,false,false desired value: true,true,true passed: false,false,false
  expression: undefined desired expression: true actual value: true,true,true,true,true desired value: true,true,true,true,true passed: true,true,true,true,true
  expression: undefined desired expression: true actual value: true,true,true,true,true desired value: true,true,true,true,true passed: true,true,true,true,true
  expression: undefined desired expression: true actual value: true,true,true,true,true desired value: true,true,true,true,true passed: true,true,true,true,true
  expression: undefined desired expression: true actual value: false,false,false,false,false desired value: true,true,true,true,true passed: false,false,false,false,false
  expression: undefined desired expression: true actual value: false,false,false,false,false desired value: true,true,true,true,true passed: false,false,false,false,false
Tracking query parameter testsWhen you browse from one web page to another, tracking companies will frequently attach a 'tracking query parameter' to the address of the second web page. That query parameter may contain a unique identifier that tracks you individually as you browse the web. And these query parameters are frequently synchronized with cookies, making them a powerful tracking vector. Web browsers can protect you from known tracking query parameters by stripping them from web addresses before your browser sends them. (The set of tracking query parameters tested here was largely borrowed from Brave.)
__hsfpHubSpot tracking parameter
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
__hsscHubSpot tracking parameter
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
__hstcHubSpot tracking parameter
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
__sDrip.com email address tracking parameter
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
_hsencHubSpot tracking parameter
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
_openstatYandex tracking parameter
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
dclidDoubleClick Click ID (Google)
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
fbclidFacebook Click Identifier
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
gclidGoogle Click Identifier
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
hsCtaTrackingHubSpot tracking parameter
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
igshidInstagram tracking parameter
  value: 4669717620939853 passed: false,false,false,false,false
  value: 13620308797307734 passed: false,false,false,false,false
  value: 10186612373224846 passed: false,false,false,false,false
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
mc_eidMailchimp Email ID (email recipient's address)
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
mkt_tokAdobe Marketo tracking parameter
  value: 4669717620939853 passed: false,false,false,false,false
  value: 13620308797307734 passed: false,false,false,false,false
  value: 10186612373224846 passed: false,false,false,false,false
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
ml_subscriberMailerLite email tracking
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
ml_subscriber_hashMailerLite email tracking
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
msclkidMicrosoft Click ID
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
oly_anon_idOmeda marketing 'anonymous' customer id
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
oly_enc_idOmeda marketing 'known' customer id
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
rb_clickidUnknown high-entropy tracking parameter
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
s_cidAdobe Site Catalyst tracking parameter
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
vero_convVero tracking parameter
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
vero_idVero tracking parameter
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
wickedidWicked Reports e-commerce tracking
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false
yclidYandex Click ID
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  passed: true,true,true,true,true
  value: 021315700798541393 passed: false,false,false,false,false
  value: 45281051930175864 passed: false,false,false,false,false
  value: 6081386961410771 passed: false,false,false,false,false
  value: 8356478676233383 passed: false,false,false,false,false
  value: 6262764401499374 passed: false,false,false,false,false
  value: 7613744827819666 passed: false,false,false,false,false
  value: 6370194747766036 passed: false,false,false,false,false
  value: 8116572967223887 passed: false,false,false
  value: 24679992138137075 passed: false,false,false,false,false
  value: 05013790658061601 passed: false,false,false,false,false
  value: 04437099131127331 passed: false,false,false,false,false
  value: 0402525690446458 passed: false,false,false,false,false
  value: 5752783676628228 passed: false,false,false,false,false