Android Browsers


brave
1.40

bromite
102.0

chrome
103.0

duckduckgo
5.129

edge
103.0

firefox
102.2

focus
102.2

mull
101.1

opera
70.3

samsung
17.0

tor
11.0

vivaldi
5.3

yandex
22.7
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 = ""; await fetch("https://altsvc.arthuredelstein.net:4433/clear"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after clear:", responseText); // Store "h3" state in Alt-Svc cache await fetch("https://altsvc.arthuredelstein.net:4433/set"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after set:", responseText); } read: async () => { const protocol = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); if ((new URL(location)).searchParams.get("thirdparty") === "same") { if (protocol !== "h3") { throw new Error("Unsupported"); } } return 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 = ""; await fetch("https://altsvc.arthuredelstein.net:4433/clear"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after clear:", responseText); // Store "h3" state in Alt-Svc cache await fetch("https://altsvc.arthuredelstein.net:4433/set"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after set:", responseText); } read: async () => { const protocol = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); if ((new URL(location)).searchParams.get("thirdparty") === "same") { if (protocol !== "h3") { throw new Error("Unsupported"); } } return 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 = ""; await fetch("https://altsvc.arthuredelstein.net:4433/clear"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after clear:", responseText); // Store "h3" state in Alt-Svc cache await fetch("https://altsvc.arthuredelstein.net:4433/set"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after set:", responseText); } read: async () => { const protocol = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); if ((new URL(location)).searchParams.get("thirdparty") === "same") { if (protocol !== "h3") { throw new Error("Unsupported"); } } return 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 = ""; await fetch("https://altsvc.arthuredelstein.net:4433/clear"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after clear:", responseText); // Store "h3" state in Alt-Svc cache await fetch("https://altsvc.arthuredelstein.net:4433/set"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after set:", responseText); } read: async () => { const protocol = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); if ((new URL(location)).searchParams.get("thirdparty") === "same") { if (protocol !== "h3") { throw new Error("Unsupported"); } } return 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 = ""; await fetch("https://altsvc.arthuredelstein.net:4433/clear"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after clear:", responseText); // Store "h3" state in Alt-Svc cache await fetch("https://altsvc.arthuredelstein.net:4433/set"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after set:", responseText); } read: async () => { const protocol = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); if ((new URL(location)).searchParams.get("thirdparty") === "same") { if (protocol !== "h3") { throw new Error("Unsupported"); } } return 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 = ""; await fetch("https://altsvc.arthuredelstein.net:4433/clear"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after clear:", responseText); // Store "h3" state in Alt-Svc cache await fetch("https://altsvc.arthuredelstein.net:4433/set"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after set:", responseText); } read: async () => { const protocol = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); if ((new URL(location)).searchParams.get("thirdparty") === "same") { if (protocol !== "h3") { throw new Error("Unsupported"); } } return 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 = ""; await fetch("https://altsvc.arthuredelstein.net:4433/clear"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after clear:", responseText); // Store "h3" state in Alt-Svc cache await fetch("https://altsvc.arthuredelstein.net:4433/set"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after set:", responseText); } read: async () => { const protocol = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); if ((new URL(location)).searchParams.get("thirdparty") === "same") { if (protocol !== "h3") { throw new Error("Unsupported"); } } return 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 = ""; await fetch("https://altsvc.arthuredelstein.net:4433/clear"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after clear:", responseText); // Store "h3" state in Alt-Svc cache await fetch("https://altsvc.arthuredelstein.net:4433/set"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after set:", responseText); } read: async () => { const protocol = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); if ((new URL(location)).searchParams.get("thirdparty") === "same") { if (protocol !== "h3") { throw new Error("Unsupported"); } } return protocol; } result, same first party: h3, h3, h3, Error: Unsupported, h3 result, different first party: h2, h2, h2, h2, h2 unsupported: false, false, false, true, false passed: true, true, true, true test failed: false, false, false, false, false
  write: async () => { // Clear Alt-Svc caching first. let responseText = ""; await fetch("https://altsvc.arthuredelstein.net:4433/clear"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after clear:", responseText); // Store "h3" state in Alt-Svc cache await fetch("https://altsvc.arthuredelstein.net:4433/set"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after set:", responseText); } read: async () => { const protocol = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); if ((new URL(location)).searchParams.get("thirdparty") === "same") { if (protocol !== "h3") { throw new Error("Unsupported"); } } return 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 = ""; await fetch("https://altsvc.arthuredelstein.net:4433/clear"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after clear:", responseText); // Store "h3" state in Alt-Svc cache await fetch("https://altsvc.arthuredelstein.net:4433/set"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after set:", responseText); } read: async () => { const protocol = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); if ((new URL(location)).searchParams.get("thirdparty") === "same") { if (protocol !== "h3") { throw new Error("Unsupported"); } } return protocol; } result, same first party: Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported 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 = ""; await fetch("https://altsvc.arthuredelstein.net:4433/clear"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after clear:", responseText); // Store "h3" state in Alt-Svc cache await fetch("https://altsvc.arthuredelstein.net:4433/set"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after set:", responseText); } read: async () => { const protocol = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); if ((new URL(location)).searchParams.get("thirdparty") === "same") { if (protocol !== "h3") { throw new Error("Unsupported"); } } return protocol; } result, same first party: Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported 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 = ""; await fetch("https://altsvc.arthuredelstein.net:4433/clear"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after clear:", responseText); // Store "h3" state in Alt-Svc cache await fetch("https://altsvc.arthuredelstein.net:4433/set"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after set:", responseText); } read: async () => { const protocol = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); if ((new URL(location)).searchParams.get("thirdparty") === "same") { if (protocol !== "h3") { throw new Error("Unsupported"); } } return 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 = ""; await fetch("https://altsvc.arthuredelstein.net:4433/clear"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after clear:", responseText); // Store "h3" state in Alt-Svc cache await fetch("https://altsvc.arthuredelstein.net:4433/set"); await sleepMs(100); responseText = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); console.log("after set:", responseText); } read: async () => { const protocol = await fetchText("https://altsvc.arthuredelstein.net:4433/protocol"); if ((new URL(location)).searchParams.get("thirdparty") === "same") { if (protocol !== "h3") { throw new Error("Unsupported"); } } return protocol; } result, same first party: h3, h3, h3, h3 result, different first party: h3, h3, h3, h3 unsupported: false, false, false, false passed: false, false, false, false test failed: false, false, false, false
blobA 'blob URL' is a local reference to some raw data. Trackers can use a blob URL to share data between websites.
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${baseURI}/blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`); } catch (e) { throw new Error("Unsupported"); } } read: async (secret) => { let response = await fetch(`${baseURI}/blob?mode=read&key=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 4df4c3bb-6cc7-4412-82ba-37b5cfb2356d, 7fbf9eda-a8de-4368-92a0-e85aeb5de4ef, 63941ce3-63dc-41fb-a8df-021f745595b2, d25918bc-c60e-4a76-91c9-b3ed5a08ead1, f371ce46-4879-4ad0-8a27-38c1605c89d8 result, different first party: 4df4c3bb-6cc7-4412-82ba-37b5cfb2356d, 7fbf9eda-a8de-4368-92a0-e85aeb5de4ef, 63941ce3-63dc-41fb-a8df-021f745595b2, d25918bc-c60e-4a76-91c9-b3ed5a08ead1, f371ce46-4879-4ad0-8a27-38c1605c89d8 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${baseURI}/blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`); } catch (e) { throw new Error("Unsupported"); } } read: async (secret) => { let response = await fetch(`${baseURI}/blob?mode=read&key=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 87f05810-2062-4020-b3ba-8377655af51f, 0fae0703-a620-4a13-abf8-5e732184acc3, 9fca7080-7813-484b-b8f9-d9615f6c8fb5, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2, 99a6eb04-2293-437a-bb29-b7b19d317c4c result, different first party: 87f05810-2062-4020-b3ba-8377655af51f, 0fae0703-a620-4a13-abf8-5e732184acc3, 9fca7080-7813-484b-b8f9-d9615f6c8fb5, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2, 99a6eb04-2293-437a-bb29-b7b19d317c4c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${baseURI}/blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`); } catch (e) { throw new Error("Unsupported"); } } read: async (secret) => { let response = await fetch(`${baseURI}/blob?mode=read&key=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 result, different first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${baseURI}/blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`); } catch (e) { throw new Error("Unsupported"); } } read: async (secret) => { let response = await fetch(`${baseURI}/blob?mode=read&key=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e result, different first party: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${baseURI}/blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`); } catch (e) { throw new Error("Unsupported"); } } read: async (secret) => { let response = await fetch(`${baseURI}/blob?mode=read&key=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a result, different first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${baseURI}/blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`); } catch (e) { throw new Error("Unsupported"); } } read: async (secret) => { let response = await fetch(`${baseURI}/blob?mode=read&key=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b result, different first party: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${baseURI}/blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`); } catch (e) { throw new Error("Unsupported"); } } read: async (secret) => { let response = await fetch(`${baseURI}/blob?mode=read&key=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: fa4457e6-fa0e-4d7a-a64e-3e2dde02af51, 708bc16a-5f7d-4242-885b-a48b6ee9a8fd, 936452bc-b970-4719-801e-55a0d8aca8b4, 23dc6e85-b433-4f47-adb1-781fa2695d03, 0bfbb3f9-c9b7-475c-aa54-5b6f45737f76 result, different first party: fa4457e6-fa0e-4d7a-a64e-3e2dde02af51, 708bc16a-5f7d-4242-885b-a48b6ee9a8fd, 936452bc-b970-4719-801e-55a0d8aca8b4, 23dc6e85-b433-4f47-adb1-781fa2695d03, 0bfbb3f9-c9b7-475c-aa54-5b6f45737f76 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${baseURI}/blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`); } catch (e) { throw new Error("Unsupported"); } } read: async (secret) => { let response = await fetch(`${baseURI}/blob?mode=read&key=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 4f9e49b9-3ec8-4356-beb1-2a66dc9dfba7, 1325f524-cb6a-4e86-b9ea-bb0bedfd3d83, c099a13f-501e-49c8-8e9d-73eebf55f85e, 6343bec4-3e3c-4c5d-bc5a-c111f5e62ff4, 566f20a8-2d87-44c7-85e9-eb4551873500 result, different first party: Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${baseURI}/blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`); } catch (e) { throw new Error("Unsupported"); } } read: async (secret) => { let response = await fetch(`${baseURI}/blob?mode=read&key=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c result, different first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${baseURI}/blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`); } catch (e) { throw new Error("Unsupported"); } } read: async (secret) => { let response = await fetch(`${baseURI}/blob?mode=read&key=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c result, different first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${baseURI}/blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`); } catch (e) { throw new Error("Unsupported"); } } read: async (secret) => { let response = await fetch(`${baseURI}/blob?mode=read&key=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: b7d2ece2-e99c-4b12-8c6a-a5c74c8925b3, 3a9f1c74-c9e1-429f-b491-0254f9de8bf6, 967fdc00-6a31-4128-a322-f5fc3bde737c, 35d2963d-68fb-4a16-910d-aadfe226f005, 86ee6f09-2bc8-4ec6-b488-eb9ffe3d3e78 result, different first party: Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${baseURI}/blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`); } catch (e) { throw new Error("Unsupported"); } } read: async (secret) => { let response = await fetch(`${baseURI}/blob?mode=read&key=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e result, different first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${baseURI}/blob?mode=write&key=${secret}&blobUrl=${encodeURIComponent(blobURL)}`); } catch (e) { throw new Error("Unsupported"); } } read: async (secret) => { let response = await fetch(`${baseURI}/blob?mode=read&key=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 result, different first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 unsupported: false, false, false, false passed: false, false, false, false test failed: 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: 4df4c3bb-6cc7-4412-82ba-37b5cfb2356d, 7fbf9eda-a8de-4368-92a0-e85aeb5de4ef, 63941ce3-63dc-41fb-a8df-021f745595b2, d25918bc-c60e-4a76-91c9-b3ed5a08ead1, f371ce46-4879-4ad0-8a27-38c1605c89d8 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: 87f05810-2062-4020-b3ba-8377655af51f, 0fae0703-a620-4a13-abf8-5e732184acc3, 9fca7080-7813-484b-b8f9-d9615f6c8fb5, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2, 99a6eb04-2293-437a-bb29-b7b19d317c4c result, different first party: 87f05810-2062-4020-b3ba-8377655af51f, 0fae0703-a620-4a13-abf8-5e732184acc3, 9fca7080-7813-484b-b8f9-d9615f6c8fb5, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2, 99a6eb04-2293-437a-bb29-b7b19d317c4c 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: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 result, different first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 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: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e result, different first party: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e 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: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a result, different first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a 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: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b result, different first party: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b 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: fa4457e6-fa0e-4d7a-a64e-3e2dde02af51, 708bc16a-5f7d-4242-885b-a48b6ee9a8fd, 936452bc-b970-4719-801e-55a0d8aca8b4, 23dc6e85-b433-4f47-adb1-781fa2695d03, 0bfbb3f9-c9b7-475c-aa54-5b6f45737f76 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: 4f9e49b9-3ec8-4356-beb1-2a66dc9dfba7, 1325f524-cb6a-4e86-b9ea-bb0bedfd3d83, c099a13f-501e-49c8-8e9d-73eebf55f85e, 6343bec4-3e3c-4c5d-bc5a-c111f5e62ff4, 566f20a8-2d87-44c7-85e9-eb4551873500 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: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c result, different first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c 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: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c result, different first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c 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: 322e6245-f8e4-4adf-8cc7-0e73b030bd66, 3a9f1c74-c9e1-429f-b491-0254f9de8bf6, 967fdc00-6a31-4128-a322-f5fc3bde737c, 35d2963d-68fb-4a16-910d-aadfe226f005, 86ee6f09-2bc8-4ec6-b488-eb9ffe3d3e78 result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let bc = new BroadcastChannel("secrets"); bc.onmessage = (event) => { if (event.data === "request") { bc.postMessage(secret); } }; } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let bc = new BroadcastChannel("secrets"); bc.onmessage = (event) => { if (event.data !== "request") { resolve(event.data); } }; bc.postMessage("request"); setTimeout(() => reject({message: "no BroadcastChannel message"}), 3000); }) result, same first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e result, different first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e 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: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 result, different first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 unsupported: false, false, false, false passed: false, false, false, false test failed: 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: db4a4976-3f4b-4464-b035-3cb96987017f, db4a4976-3f4b-4464-b035-3cb96987017f, db4a4976-3f4b-4464-b035-3cb96987017f, db4a4976-3f4b-4464-b035-3cb96987017f, db4a4976-3f4b-4464-b035-3cb96987017f result, different first party: Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: cfc23bc0-1b50-454a-bd4b-4faa79e27282, cfc23bc0-1b50-454a-bd4b-4faa79e27282, cfc23bc0-1b50-454a-bd4b-4faa79e27282, cfc23bc0-1b50-454a-bd4b-4faa79e27282, cfc23bc0-1b50-454a-bd4b-4faa79e27282 result, different first party: Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: ae3a5c11-9564-4c12-8aa3-be101efafcac, ae3a5c11-9564-4c12-8aa3-be101efafcac, ae3a5c11-9564-4c12-8aa3-be101efafcac, ae3a5c11-9564-4c12-8aa3-be101efafcac, ae3a5c11-9564-4c12-8aa3-be101efafcac result, different first party: ae3a5c11-9564-4c12-8aa3-be101efafcac, ae3a5c11-9564-4c12-8aa3-be101efafcac, ae3a5c11-9564-4c12-8aa3-be101efafcac, ae3a5c11-9564-4c12-8aa3-be101efafcac, ae3a5c11-9564-4c12-8aa3-be101efafcac 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 15266b11-0e1e-403f-a042-cffdd1cac15d, 15266b11-0e1e-403f-a042-cffdd1cac15d, 15266b11-0e1e-403f-a042-cffdd1cac15d, 15266b11-0e1e-403f-a042-cffdd1cac15d, 15266b11-0e1e-403f-a042-cffdd1cac15d result, different first party: 15266b11-0e1e-403f-a042-cffdd1cac15d, 15266b11-0e1e-403f-a042-cffdd1cac15d, 15266b11-0e1e-403f-a042-cffdd1cac15d, 15266b11-0e1e-403f-a042-cffdd1cac15d, 15266b11-0e1e-403f-a042-cffdd1cac15d unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: a31f292d-e51f-4b73-9a44-c3f7cc814f0f, a31f292d-e51f-4b73-9a44-c3f7cc814f0f, a31f292d-e51f-4b73-9a44-c3f7cc814f0f, a31f292d-e51f-4b73-9a44-c3f7cc814f0f, a31f292d-e51f-4b73-9a44-c3f7cc814f0f result, different first party: a31f292d-e51f-4b73-9a44-c3f7cc814f0f, a31f292d-e51f-4b73-9a44-c3f7cc814f0f, a31f292d-e51f-4b73-9a44-c3f7cc814f0f, a31f292d-e51f-4b73-9a44-c3f7cc814f0f, a31f292d-e51f-4b73-9a44-c3f7cc814f0f unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a result, different first party: dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a, dbd0fdf5-1be2-41d7-a0aa-b0261e5fe14a unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 1c6f45dd-c6f8-49c2-b333-53ea2929d324, 1c6f45dd-c6f8-49c2-b333-53ea2929d324, 1c6f45dd-c6f8-49c2-b333-53ea2929d324, 1c6f45dd-c6f8-49c2-b333-53ea2929d324, 1c6f45dd-c6f8-49c2-b333-53ea2929d324 result, different first party: Error: cacheKeys[0] is undefined, Error: cacheKeys[0] is undefined, Error: cacheKeys[0] is undefined, Error: cacheKeys[0] is undefined, Error: cacheKeys[0] is undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${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: fdf85031-7ac8-493f-a360-d445972cec4c, fdf85031-7ac8-493f-a360-d445972cec4c, fdf85031-7ac8-493f-a360-d445972cec4c, fdf85031-7ac8-493f-a360-d445972cec4c, fdf85031-7ac8-493f-a360-d445972cec4c result, different first party: fdf85031-7ac8-493f-a360-d445972cec4c, fdf85031-7ac8-493f-a360-d445972cec4c, fdf85031-7ac8-493f-a360-d445972cec4c, fdf85031-7ac8-493f-a360-d445972cec4c, fdf85031-7ac8-493f-a360-d445972cec4c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8 result, different first party: ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8, ec45e5be-a09a-4677-9e6e-714e2a54cbc8 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e result, different first party: 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e, 50cf7e85-4ac9-44a2-be56-3cd7acd17d5e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: fc6672b5-c2e0-40e1-bac8-008f561e753b, fc6672b5-c2e0-40e1-bac8-008f561e753b, fc6672b5-c2e0-40e1-bac8-008f561e753b, fc6672b5-c2e0-40e1-bac8-008f561e753b result, different first party: fc6672b5-c2e0-40e1-bac8-008f561e753b, fc6672b5-c2e0-40e1-bac8-008f561e753b, fc6672b5-c2e0-40e1-bac8-008f561e753b, fc6672b5-c2e0-40e1-bac8-008f561e753b unsupported: false, false, false, false passed: false, false, false, false test failed: false, false, false, false
cookie (HTTP)The cookie, first introduced by Netscape in 1994, is a small amount of data stored by your browser on a website's behalf. It has legitimate uses, but it is also the classic cross-site tracking mechanism, and today still the most popular method of tracking users across websites. Browsers can stop cookies from being used for cross-site tracking by either blocking or partitioning them.
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: 4df4c3bb-6cc7-4412-82ba-37b5cfb2356d_http, 7fbf9eda-a8de-4368-92a0-e85aeb5de4ef_http, 63941ce3-63dc-41fb-a8df-021f745595b2_http, d25918bc-c60e-4a76-91c9-b3ed5a08ead1_http, f371ce46-4879-4ad0-8a27-38c1605c89d8_http result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: 87f05810-2062-4020-b3ba-8377655af51f_http, 0fae0703-a620-4a13-abf8-5e732184acc3_http, 9fca7080-7813-484b-b8f9-d9615f6c8fb5_http, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2_http, 99a6eb04-2293-437a-bb29-b7b19d317c4c_http result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c_http, eaf075c4-07fd-4bbc-9dde-0aa314af64e3_http, c93d27a0-0378-46a2-a020-56d9dcb0f6e8_http, b1ff2109-eb06-4b39-858c-0bd2bf1299ad_http, 68577d6f-a132-4dae-8b41-45963e05a674_http result, different first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c_http, eaf075c4-07fd-4bbc-9dde-0aa314af64e3_http, c93d27a0-0378-46a2-a020-56d9dcb0f6e8_http, b1ff2109-eb06-4b39-858c-0bd2bf1299ad_http, 68577d6f-a132-4dae-8b41-45963e05a674_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: b06b6d31-f5f0-4487-8325-98d63eed3699_http, 62faf6e5-4601-433a-a05f-1d642e49d6a7_http, c23de529-1643-4de0-995f-fb6dfa6f50df_http, 381060ba-e4e8-4da3-be58-9e803628aa82_http, 4dea3232-6094-417f-8325-01f535e9ad8e_http result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663_http, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65_http, 16a0309b-9981-4a65-a3de-495300c5ea0e_http, 66dca488-c132-477e-835c-88bb8803291a_http, f19c95f7-5fda-4249-b3c6-5b13d020317a_http result, different first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663_http, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65_http, 16a0309b-9981-4a65-a3de-495300c5ea0e_http, 66dca488-c132-477e-835c-88bb8803291a_http, f19c95f7-5fda-4249-b3c6-5b13d020317a_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: 749d1c56-a847-45bc-9288-717e3f5b68b0_http, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee_http, bd945ba5-3105-4474-848a-e5d39a3a43a9_http, 94dadc41-b57d-4efb-bb2f-123db8a3c423_http, 243bbf0f-9a75-4696-b8d5-b19d89ade08b_http result, different first party: 749d1c56-a847-45bc-9288-717e3f5b68b0_http, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee_http, bd945ba5-3105-4474-848a-e5d39a3a43a9_http, 94dadc41-b57d-4efb-bb2f-123db8a3c423_http, 243bbf0f-9a75-4696-b8d5-b19d89ade08b_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: fa4457e6-fa0e-4d7a-a64e-3e2dde02af51_http, 708bc16a-5f7d-4242-885b-a48b6ee9a8fd_http, 936452bc-b970-4719-801e-55a0d8aca8b4_http, 23dc6e85-b433-4f47-adb1-781fa2695d03_http, 0bfbb3f9-c9b7-475c-aa54-5b6f45737f76_http result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: 4f9e49b9-3ec8-4356-beb1-2a66dc9dfba7_http, 1325f524-cb6a-4e86-b9ea-bb0bedfd3d83_http, c099a13f-501e-49c8-8e9d-73eebf55f85e_http, 6343bec4-3e3c-4c5d-bc5a-c111f5e62ff4_http, 566f20a8-2d87-44c7-85e9-eb4551873500_http result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504_http, 4dcf9278-e628-43ef-937d-8fb0c2af9668_http, c7687444-26c4-4e11-95cd-7dd150dcae2b_http, 0a3d8601-ef6b-454d-9fcb-54b9a494b768_http, e70907ff-755e-41ab-a68e-9ef78d37237c_http result, different first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504_http, 4dcf9278-e628-43ef-937d-8fb0c2af9668_http, c7687444-26c4-4e11-95cd-7dd150dcae2b_http, 0a3d8601-ef6b-454d-9fcb-54b9a494b768_http, e70907ff-755e-41ab-a68e-9ef78d37237c_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581_http, bc5106e1-0a46-4af8-be1c-c3402db8492f_http, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3_http, 54057180-98aa-497e-8549-249ba617cad5_http, ff768cb3-c84c-46d1-8377-e45b292b3b5c_http result, different first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581_http, bc5106e1-0a46-4af8-be1c-c3402db8492f_http, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3_http, 54057180-98aa-497e-8549-249ba617cad5_http, ff768cb3-c84c-46d1-8377-e45b292b3b5c_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: b7d2ece2-e99c-4b12-8c6a-a5c74c8925b3_http, 3a9f1c74-c9e1-429f-b491-0254f9de8bf6_http, 967fdc00-6a31-4128-a322-f5fc3bde737c_http, 35d2963d-68fb-4a16-910d-aadfe226f005_http, 86ee6f09-2bc8-4ec6-b488-eb9ffe3d3e78_http result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1_http, f5d57249-2542-4421-8060-3d10dd1ba280_http, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977_http, 4a492d07-dfda-417b-9332-eac5837573af_http, f107c6aa-ce4c-488e-b6d6-d11458af932e_http result, different first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1_http, f5d57249-2542-4421-8060-3d10dd1ba280_http, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977_http, 4a492d07-dfda-417b-9332-eac5837573af_http, f107c6aa-ce4c-488e-b6d6-d11458af932e_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${baseURI}cookie?secret=${secret}_http`); } read: async () => { // Test if we now send a requests with a 'cookie' header containing the secret. let response = await fetch(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5_http, 852005f8-633b-4a09-8466-65b2464683d8_http, 73a873af-a746-4c62-ad4e-96a260486458_http, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25_http result, different first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5_http, 852005f8-633b-4a09-8466-65b2464683d8_http, 73a873af-a746-4c62-ad4e-96a260486458_http, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25_http unsupported: false, false, false, false passed: false, false, false, false test failed: false, false, false, false
cookie (JS)The cookie, first introduced by Netscape in 1994, is a small amount of data stored by your browser on a website's behalf. It has legitimate uses, but it is also the classic cross-site tracking mechanism, and today still the most popular method of tracking users across websites. Browsers can stop cookies from being used for cross-site tracking by either blocking or partitioning them.
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 4df4c3bb-6cc7-4412-82ba-37b5cfb2356d_js, 7fbf9eda-a8de-4368-92a0-e85aeb5de4ef_js, 63941ce3-63dc-41fb-a8df-021f745595b2_js, d25918bc-c60e-4a76-91c9-b3ed5a08ead1_js, f371ce46-4879-4ad0-8a27-38c1605c89d8_js result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 87f05810-2062-4020-b3ba-8377655af51f_js, 0fae0703-a620-4a13-abf8-5e732184acc3_js, 9fca7080-7813-484b-b8f9-d9615f6c8fb5_js, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2_js, 99a6eb04-2293-437a-bb29-b7b19d317c4c_js result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c_js, eaf075c4-07fd-4bbc-9dde-0aa314af64e3_js, c93d27a0-0378-46a2-a020-56d9dcb0f6e8_js, b1ff2109-eb06-4b39-858c-0bd2bf1299ad_js, 68577d6f-a132-4dae-8b41-45963e05a674_js result, different first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c_js, eaf075c4-07fd-4bbc-9dde-0aa314af64e3_js, c93d27a0-0378-46a2-a020-56d9dcb0f6e8_js, b1ff2109-eb06-4b39-858c-0bd2bf1299ad_js, 68577d6f-a132-4dae-8b41-45963e05a674_js unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: b06b6d31-f5f0-4487-8325-98d63eed3699_js, 62faf6e5-4601-433a-a05f-1d642e49d6a7_js, c23de529-1643-4de0-995f-fb6dfa6f50df_js, 381060ba-e4e8-4da3-be58-9e803628aa82_js, 4dea3232-6094-417f-8325-01f535e9ad8e_js result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663_js, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65_js, 16a0309b-9981-4a65-a3de-495300c5ea0e_js, 66dca488-c132-477e-835c-88bb8803291a_js, f19c95f7-5fda-4249-b3c6-5b13d020317a_js result, different first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663_js, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65_js, 16a0309b-9981-4a65-a3de-495300c5ea0e_js, 66dca488-c132-477e-835c-88bb8803291a_js, f19c95f7-5fda-4249-b3c6-5b13d020317a_js unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 749d1c56-a847-45bc-9288-717e3f5b68b0_js, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee_js, bd945ba5-3105-4474-848a-e5d39a3a43a9_js, 94dadc41-b57d-4efb-bb2f-123db8a3c423_js, 243bbf0f-9a75-4696-b8d5-b19d89ade08b_js result, different first party: 749d1c56-a847-45bc-9288-717e3f5b68b0_js, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee_js, bd945ba5-3105-4474-848a-e5d39a3a43a9_js, 94dadc41-b57d-4efb-bb2f-123db8a3c423_js, 243bbf0f-9a75-4696-b8d5-b19d89ade08b_js unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: fa4457e6-fa0e-4d7a-a64e-3e2dde02af51_js, 708bc16a-5f7d-4242-885b-a48b6ee9a8fd_js, 936452bc-b970-4719-801e-55a0d8aca8b4_js, 23dc6e85-b433-4f47-adb1-781fa2695d03_js, 0bfbb3f9-c9b7-475c-aa54-5b6f45737f76_js result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 4f9e49b9-3ec8-4356-beb1-2a66dc9dfba7_js, 1325f524-cb6a-4e86-b9ea-bb0bedfd3d83_js, c099a13f-501e-49c8-8e9d-73eebf55f85e_js, 6343bec4-3e3c-4c5d-bc5a-c111f5e62ff4_js, 566f20a8-2d87-44c7-85e9-eb4551873500_js result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504_js, 4dcf9278-e628-43ef-937d-8fb0c2af9668_js, c7687444-26c4-4e11-95cd-7dd150dcae2b_js, 0a3d8601-ef6b-454d-9fcb-54b9a494b768_js, e70907ff-755e-41ab-a68e-9ef78d37237c_js result, different first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504_js, 4dcf9278-e628-43ef-937d-8fb0c2af9668_js, c7687444-26c4-4e11-95cd-7dd150dcae2b_js, 0a3d8601-ef6b-454d-9fcb-54b9a494b768_js, e70907ff-755e-41ab-a68e-9ef78d37237c_js unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581_js, bc5106e1-0a46-4af8-be1c-c3402db8492f_js, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3_js, 54057180-98aa-497e-8549-249ba617cad5_js, ff768cb3-c84c-46d1-8377-e45b292b3b5c_js result, different first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581_js, bc5106e1-0a46-4af8-be1c-c3402db8492f_js, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3_js, 54057180-98aa-497e-8549-249ba617cad5_js, ff768cb3-c84c-46d1-8377-e45b292b3b5c_js unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: b7d2ece2-e99c-4b12-8c6a-a5c74c8925b3_js, 3a9f1c74-c9e1-429f-b491-0254f9de8bf6_js, 967fdc00-6a31-4128-a322-f5fc3bde737c_js, 35d2963d-68fb-4a16-910d-aadfe226f005_js, 86ee6f09-2bc8-4ec6-b488-eb9ffe3d3e78_js result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1_js, f5d57249-2542-4421-8060-3d10dd1ba280_js, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977_js, 4a492d07-dfda-417b-9332-eac5837573af_js, f107c6aa-ce4c-488e-b6d6-d11458af932e_js result, different first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1_js, f5d57249-2542-4421-8060-3d10dd1ba280_js, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977_js, 4a492d07-dfda-417b-9332-eac5837573af_js, f107c6aa-ce4c-488e-b6d6-d11458af932e_js unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5_js, 852005f8-633b-4a09-8466-65b2464683d8_js, 73a873af-a746-4c62-ad4e-96a260486458_js, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25_js result, different first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5_js, 852005f8-633b-4a09-8466-65b2464683d8_js, 73a873af-a746-4c62-ad4e-96a260486458_js, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25_js unsupported: false, false, false, false passed: false, false, false, false test failed: false, false, false, false
CookieStoreThe Cookie Store API is an alternative asynchronous API for managing cookies, supported by some browsers.
  write: (data) => { const msPerHour = 60 * 60 * 1000; if (!window.cookieStore) { throw new Error("Unsupported"); } window.cookieStore.set({ name: "partition_test", value: data, expires: Date.now() + msPerHour, sameSite: "none" }); } read: async () => { if (!window.cookieStore) { throw new Error("Unsupported"); } const cookie = await window.cookieStore.get("partition_test"); if (!cookie) { return null; } return cookie.value; } result, same first party: 4df4c3bb-6cc7-4412-82ba-37b5cfb2356d, 7fbf9eda-a8de-4368-92a0-e85aeb5de4ef, 63941ce3-63dc-41fb-a8df-021f745595b2, d25918bc-c60e-4a76-91c9-b3ed5a08ead1, f371ce46-4879-4ad0-8a27-38c1605c89d8 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (data) => { const msPerHour = 60 * 60 * 1000; if (!window.cookieStore) { throw new Error("Unsupported"); } window.cookieStore.set({ name: "partition_test", value: data, expires: Date.now() + msPerHour, sameSite: "none" }); } read: async () => { if (!window.cookieStore) { throw new Error("Unsupported"); } const cookie = await window.cookieStore.get("partition_test"); if (!cookie) { return null; } return cookie.value; } result, same first party: 87f05810-2062-4020-b3ba-8377655af51f, 0fae0703-a620-4a13-abf8-5e732184acc3, 9fca7080-7813-484b-b8f9-d9615f6c8fb5, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2, 99a6eb04-2293-437a-bb29-b7b19d317c4c result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (data) => { const msPerHour = 60 * 60 * 1000; if (!window.cookieStore) { throw new Error("Unsupported"); } window.cookieStore.set({ name: "partition_test", value: data, expires: Date.now() + msPerHour, sameSite: "none" }); } read: async () => { if (!window.cookieStore) { throw new Error("Unsupported"); } const cookie = await window.cookieStore.get("partition_test"); if (!cookie) { return null; } return cookie.value; } result, same first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 result, different first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (data) => { const msPerHour = 60 * 60 * 1000; if (!window.cookieStore) { throw new Error("Unsupported"); } window.cookieStore.set({ name: "partition_test", value: data, expires: Date.now() + msPerHour, sameSite: "none" }); } read: async () => { if (!window.cookieStore) { throw new Error("Unsupported"); } const cookie = await window.cookieStore.get("partition_test"); if (!cookie) { return null; } return cookie.value; } result, same first party: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (data) => { const msPerHour = 60 * 60 * 1000; if (!window.cookieStore) { throw new Error("Unsupported"); } window.cookieStore.set({ name: "partition_test", value: data, expires: Date.now() + msPerHour, sameSite: "none" }); } read: async () => { if (!window.cookieStore) { throw new Error("Unsupported"); } const cookie = await window.cookieStore.get("partition_test"); if (!cookie) { return null; } return cookie.value; } result, same first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a result, different first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: (data) => { const msPerHour = 60 * 60 * 1000; if (!window.cookieStore) { throw new Error("Unsupported"); } window.cookieStore.set({ name: "partition_test", value: data, expires: Date.now() + msPerHour, sameSite: "none" }); } read: async () => { if (!window.cookieStore) { throw new Error("Unsupported"); } const cookie = await window.cookieStore.get("partition_test"); if (!cookie) { return null; } return cookie.value; } result, same first party: Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported result, different first party: Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (data) => { const msPerHour = 60 * 60 * 1000; if (!window.cookieStore) { throw new Error("Unsupported"); } window.cookieStore.set({ name: "partition_test", value: data, expires: Date.now() + msPerHour, sameSite: "none" }); } read: async () => { if (!window.cookieStore) { throw new Error("Unsupported"); } const cookie = await window.cookieStore.get("partition_test"); if (!cookie) { return null; } return cookie.value; } result, same first party: Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported result, different first party: Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (data) => { const msPerHour = 60 * 60 * 1000; if (!window.cookieStore) { throw new Error("Unsupported"); } window.cookieStore.set({ name: "partition_test", value: data, expires: Date.now() + msPerHour, sameSite: "none" }); } read: async () => { if (!window.cookieStore) { throw new Error("Unsupported"); } const cookie = await window.cookieStore.get("partition_test"); if (!cookie) { return null; } return cookie.value; } result, same first party: Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported result, different first party: Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: (data) => { const msPerHour = 60 * 60 * 1000; if (!window.cookieStore) { throw new Error("Unsupported"); } window.cookieStore.set({ name: "partition_test", value: data, expires: Date.now() + msPerHour, sameSite: "none" }); } read: async () => { if (!window.cookieStore) { throw new Error("Unsupported"); } const cookie = await window.cookieStore.get("partition_test"); if (!cookie) { return null; } return cookie.value; } result, same first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c result, different first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (data) => { const msPerHour = 60 * 60 * 1000; if (!window.cookieStore) { throw new Error("Unsupported"); } window.cookieStore.set({ name: "partition_test", value: data, expires: Date.now() + msPerHour, sameSite: "none" }); } read: async () => { if (!window.cookieStore) { throw new Error("Unsupported"); } const cookie = await window.cookieStore.get("partition_test"); if (!cookie) { return null; } return cookie.value; } result, same first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c result, different first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: (data) => { const msPerHour = 60 * 60 * 1000; if (!window.cookieStore) { throw new Error("Unsupported"); } window.cookieStore.set({ name: "partition_test", value: data, expires: Date.now() + msPerHour, sameSite: "none" }); } read: async () => { if (!window.cookieStore) { throw new Error("Unsupported"); } const cookie = await window.cookieStore.get("partition_test"); if (!cookie) { return null; } return cookie.value; } result, same first party: Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported result, different first party: Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported, Error: Unsupported unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: (data) => { const msPerHour = 60 * 60 * 1000; if (!window.cookieStore) { throw new Error("Unsupported"); } window.cookieStore.set({ name: "partition_test", value: data, expires: Date.now() + msPerHour, sameSite: "none" }); } read: async () => { if (!window.cookieStore) { throw new Error("Unsupported"); } const cookie = await window.cookieStore.get("partition_test"); if (!cookie) { return null; } return cookie.value; } result, same first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e result, different first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (data) => { const msPerHour = 60 * 60 * 1000; if (!window.cookieStore) { throw new Error("Unsupported"); } window.cookieStore.set({ name: "partition_test", value: data, expires: Date.now() + msPerHour, sameSite: "none" }); } read: async () => { if (!window.cookieStore) { throw new Error("Unsupported"); } const cookie = await window.cookieStore.get("partition_test"); if (!cookie) { return null; } return cookie.value; } result, same first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 result, different first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 unsupported: false, false, false, false passed: false, false, false, false test failed: false, false, false, false
CSS cacheCSS stylesheets are cached, and if that cache is shared between websites, it can be used to track users across sites.
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_9752897151143753, fake_8289690460839607, fake_037155640069144624, fake_7722337981859224, fake_819214968759213 result, different first party: fake_4480340374743923, fake_7687825422248611, fake_321224048483127, fake_16238483697980066, fake_8228985269144675 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_6444820537346438, fake_8534048476948806, fake_5772035034749425, fake_7486160947561282, fake_32811906352721376 result, different first party: fake_6444820537346438, fake_8534048476948806, fake_5772035034749425, fake_8745033683839252, fake_32811906352721376 unsupported: false, false, false, false, false passed: false, false, false, true, false test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_37428412072895045, fake_6598147766456974, fake_5921360588187297, fake_4944960375550005, fake_6272629183082812 result, different first party: fake_4559125946375875, fake_4718570283528034, fake_5142676145675904, fake_38310797472402447, fake_5115664305366583 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_5301832991063844, fake_8927088197549407, fake_5393962753722226, fake_10733359581956048, fake_8938886475412131 result, different first party: fake_5301832991063844, fake_8927088197549407, fake_5393962753722226, fake_10733359581956048, fake_8938886475412131 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_022736715999353896, fake_32274864312286633, fake_8588110281380072, fake_2918287035053362, fake_3792678393711013 result, different first party: fake_022736715999353896, fake_526897885689958, fake_0376795924325799, fake_06594602202290378, fake_23406258696532678 unsupported: false, false, false, false, false passed: false, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_18212328161469515, fake_5308746291222102, fake_5907889984187391, fake_8145646073040276, fake_763703721916255 result, different first party: fake_5012971507951884, fake_2553588482211757, fake_41342231617568537, fake_20993751889806322, fake_4718964765528382 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_945612941577213, fake_35565309848993665, fake_2205495217756437, fake_2712467998810357, fake_7252306462126628 result, different first party: fake_7666263946382532, fake_09740800020927742, fake_43098012302461886, fake_3949871427488292, fake_1347864857896477 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_7799660319205022, fake_2363811095231909, fake_8344422534745335, fake_7237318881671773, fake_9671496577439982 result, different first party: fake_5480525605837616, fake_12335237085433381, fake_4676536012889654, fake_0859029120829835, fake_4579963196700527 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_527076917025366, fake_26709380767857294, fake_19924282355205114, fake_8194558204380766, fake_9485365137688448 result, different first party: fake_527076917025366, fake_26709380767857294, fake_19924282355205114, fake_8194558204380766, fake_9485365137688448 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_5129556061008782, fake_7274380828043572, fake_8217101000262061, fake_46803523586261675, fake_36998820083208805 result, different first party: fake_5129556061008782, fake_7274380828043572, fake_8217101000262061, fake_46803523586261675, fake_36998820083208805 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_8519650076437542, fake_7926687629411935, fake_5287969279596283, fake_27396400180902036, fake_9327972649575962 result, different first party: fake_5869792437889105, fake_43098177899979717, fake_37297591121890084, fake_19354559892577128, fake_557749905418208 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_7093026642360527, fake_20922940356780773, fake_2248706185207907, fake_5159089782487911, fake_5031495808658273 result, different first party: fake_7093026642360527, fake_45387780117339815, fake_574807985931219, fake_616038625362757, fake_3834192153827889 unsupported: false, false, false, false, false passed: false, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += `<link type="text/css" rel="stylesheet" href="${href}">`; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_46790801359393974, fake_9553438228972368, fake_9521178823852994, fake_1802916475993026 result, different first party: fake_3387769845276194, fake_657359366486348, fake_15840416563203807, fake_7696569876907646 unsupported: false, false, false, false passed: true, true, true, true test failed: 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: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received result, different first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received result, different first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1 result, different first party: 2, 2, 2, 2 unsupported: false, false, false, false passed: true, true, true, true test failed: 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: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); return key; } read: async (key) => { let response = await fetch(testURI("resource", "fetch", key), {cache: "force-cache"}); let countResponse = await fetch(testURI("ctr", "fetch", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1 result, different first party: 2, 2, 2, 2 unsupported: false, false, false, false passed: true, true, true, true test failed: 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, 1, 1, 1, 2 unsupported: false, false, false, false, false passed: true, false, false, false, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  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, 2, 2, 2, 1 unsupported: false, false, false, false, false passed: false, 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: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1 result, different first party: 2, 2, 2, 2 unsupported: false, false, false, false passed: true, true, true, true test failed: false, false, false, false
H1 connectionHTTP/1.x are the classic web connection protocols. If these connections are re-used across websites, they can be used to track users.
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 4df4c3bb-6cc7-4412-82ba-37b5cfb2356d, 7fbf9eda-a8de-4368-92a0-e85aeb5de4ef, 63941ce3-63dc-41fb-a8df-021f745595b2, d25918bc-c60e-4a76-91c9-b3ed5a08ead1, f371ce46-4879-4ad0-8a27-38c1605c89d8 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 87f05810-2062-4020-b3ba-8377655af51f, 0fae0703-a620-4a13-abf8-5e732184acc3, 9fca7080-7813-484b-b8f9-d9615f6c8fb5, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2, 99a6eb04-2293-437a-bb29-b7b19d317c4c result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 result, different first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e result, different first party: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a result, different first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: fa4457e6-fa0e-4d7a-a64e-3e2dde02af51, 708bc16a-5f7d-4242-885b-a48b6ee9a8fd, 936452bc-b970-4719-801e-55a0d8aca8b4, 23dc6e85-b433-4f47-adb1-781fa2695d03, 0bfbb3f9-c9b7-475c-aa54-5b6f45737f76 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 4f9e49b9-3ec8-4356-beb1-2a66dc9dfba7, 1325f524-cb6a-4e86-b9ea-bb0bedfd3d83, c099a13f-501e-49c8-8e9d-73eebf55f85e, 6343bec4-3e3c-4c5d-bc5a-c111f5e62ff4, 566f20a8-2d87-44c7-85e9-eb4551873500 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c result, different first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c result, different first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: b7d2ece2-e99c-4b12-8c6a-a5c74c8925b3, 3a9f1c74-c9e1-429f-b491-0254f9de8bf6, 967fdc00-6a31-4128-a322-f5fc3bde737c, 35d2963d-68fb-4a16-910d-aadfe226f005, 86ee6f09-2bc8-4ec6-b488-eb9ffe3d3e78 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e result, different first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 result, different first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 unsupported: false, false, false, false passed: false, false, false, false test failed: false, false, false, false
H2 connectionHTTP/2 is a web connection protocol introduced in 2015. Some browsers re-use HTTP/2 connections across websites and can thus be used to track users.
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 4df4c3bb-6cc7-4412-82ba-37b5cfb2356d, 7fbf9eda-a8de-4368-92a0-e85aeb5de4ef, 63941ce3-63dc-41fb-a8df-021f745595b2, d25918bc-c60e-4a76-91c9-b3ed5a08ead1, f371ce46-4879-4ad0-8a27-38c1605c89d8 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 87f05810-2062-4020-b3ba-8377655af51f, 0fae0703-a620-4a13-abf8-5e732184acc3, 9fca7080-7813-484b-b8f9-d9615f6c8fb5, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2, 99a6eb04-2293-437a-bb29-b7b19d317c4c result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 result, different first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e result, different first party: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a result, different first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: fa4457e6-fa0e-4d7a-a64e-3e2dde02af51, 708bc16a-5f7d-4242-885b-a48b6ee9a8fd, 936452bc-b970-4719-801e-55a0d8aca8b4, 23dc6e85-b433-4f47-adb1-781fa2695d03, 0bfbb3f9-c9b7-475c-aa54-5b6f45737f76 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 4f9e49b9-3ec8-4356-beb1-2a66dc9dfba7, 1325f524-cb6a-4e86-b9ea-bb0bedfd3d83, c099a13f-501e-49c8-8e9d-73eebf55f85e, 6343bec4-3e3c-4c5d-bc5a-c111f5e62ff4, 566f20a8-2d87-44c7-85e9-eb4551873500 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c result, different first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c result, different first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: b7d2ece2-e99c-4b12-8c6a-a5c74c8925b3, 3a9f1c74-c9e1-429f-b491-0254f9de8bf6, 967fdc00-6a31-4128-a322-f5fc3bde737c, 35d2963d-68fb-4a16-910d-aadfe226f005, 86ee6f09-2bc8-4ec6-b488-eb9ffe3d3e78 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e result, different first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 result, different first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 unsupported: false, false, false, false passed: false, false, false, false test failed: 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:4434/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); let text = await response.text(); // Empty response text indicates we are not connecting over h3: if (text.trim() === "") { throw new Error("Unsupported"); } } read: async () => { let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`); return await response.text(); } result, same first party: dc99a41122574704003eee0ada95509c, 7d7377989fae83070422f57e28b0d6f4, f0de0652c7610d76127d71ade6ca6de9, b57ee3fdd00f89bba2e3268706e27b79, dc821fb83ee64ff8e9f02d1935d9e6ab result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Ensure that we can switch over to h3 via alt-svc: for (let i = 0; i<3; ++i) { await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); let text = await response.text(); // Empty response text indicates we are not connecting over h3: if (text.trim() === "") { throw new Error("Unsupported"); } } read: async () => { let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`); return await response.text(); } result, same first party: c002808808515da468c0de0d8c5d5106, d5996cdd4e669054a369c420f65e2925, 08e30010dd2132ef52672999f9250894, 96f3179b270be6b1b2b0bf39eca71984, 7fa1c0aac9c9b8bd10b62707bcacdbe8 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Ensure that we can switch over to h3 via alt-svc: for (let i = 0; i<3; ++i) { await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); let text = await response.text(); // Empty response text indicates we are not connecting over h3: if (text.trim() === "") { throw new Error("Unsupported"); } } read: async () => { let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`); return await response.text(); } result, same first party: cd5dc62fc3f4de61003522f9c1e0aa7e, b2f9d0e696dd066b5a922712520f2a21, f3688190705af203dca50c6dc166b23c, e9dc7d90f1085c2445edeed5718530ca, e612f13462791365a62b1d6bb7b24d3e result, different first party: cd5dc62fc3f4de61003522f9c1e0aa7e, b2f9d0e696dd066b5a922712520f2a21, f3688190705af203dca50c6dc166b23c, e9dc7d90f1085c2445edeed5718530ca, e612f13462791365a62b1d6bb7b24d3e 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:4434/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); let text = await response.text(); // Empty response text indicates we are not connecting over h3: if (text.trim() === "") { throw new Error("Unsupported"); } } read: async () => { let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`); return await response.text(); } result, same first party: 5767aaec162d233d0a439f9116e8b495, 9fc14ee3d470b22fef4da7babe3b472c, 6b893daf713d89fea674ca8cdc7d9b34, fab63f621899d31e30be3521cec8e3dc, f7edcf03781463aec532d9ba34ebed88 result, different first party: 5767aaec162d233d0a439f9116e8b495, 9fc14ee3d470b22fef4da7babe3b472c, 6b893daf713d89fea674ca8cdc7d9b34, fab63f621899d31e30be3521cec8e3dc, f7edcf03781463aec532d9ba34ebed88 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:4434/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); let text = await response.text(); // Empty response text indicates we are not connecting over h3: if (text.trim() === "") { throw new Error("Unsupported"); } } read: async () => { let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`); return await response.text(); } result, same first party: be7cbd77fd6615d2b8942d5e098ce397, 032e1e904988782260918dfa5b173496, 729fb67b55aef7e090a8e1858cc17964, 93ad92ca0621be1339d4739240c23186, dc352be6f1dda8fb9f34e43dfe3e71e0 result, different first party: be7cbd77fd6615d2b8942d5e098ce397, 032e1e904988782260918dfa5b173496, 729fb67b55aef7e090a8e1858cc17964, 93ad92ca0621be1339d4739240c23186, dc352be6f1dda8fb9f34e43dfe3e71e0 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:4434/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); let text = await response.text(); // Empty response text indicates we are not connecting over h3: if (text.trim() === "") { throw new Error("Unsupported"); } } read: async () => { let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`); return await response.text(); } result, same first party: ee8c533edcc3e976f83d3073e4851856, 407e4fcaf97000a40fd047cace3cf950, 7740fa2a5095897d200ce3ddeaa49ea7, 39cfa5faadfc91a5fbf081512558a6df, 37c45dd425e163f83bf7f53dea1c4fad result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Ensure that we can switch over to h3 via alt-svc: for (let i = 0; i<3; ++i) { await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); let text = await response.text(); // Empty response text indicates we are not connecting over h3: if (text.trim() === "") { throw new Error("Unsupported"); } } read: async () => { let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`); return await response.text(); } result, same first party: 5923646774f0ee1e58a8dcdc4d2bf928, b8f4a24e912ee47e7c27c5448e509574, b5963091cbae70e72e94281d53df1a4e, 476b286db8af82fa8b014d1b58677f9a, b286775033572793b185517d56f2ba5b result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Ensure that we can switch over to h3 via alt-svc: for (let i = 0; i<3; ++i) { await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); let text = await response.text(); // Empty response text indicates we are not connecting over h3: if (text.trim() === "") { throw new Error("Unsupported"); } } read: async () => { let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`); return await response.text(); } result, same first party: bc58a239e60581663179d0351f05cb95, 39223d7ec34238c73dbdc2f9e93d5c5e, 68e9685d2b654076a4912c37476e36bb, f51a4b8f4924468ff6a6b1211a6a15e7, 937fe7e782ce8ed7eaf6226b8e8345e4 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Ensure that we can switch over to h3 via alt-svc: for (let i = 0; i<3; ++i) { await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); let text = await response.text(); // Empty response text indicates we are not connecting over h3: if (text.trim() === "") { throw new Error("Unsupported"); } } read: async () => { let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`); return await response.text(); } result, same first party: c8d55de186fc37cc8b087392acafa1e4, ccd012433a9abf82e8aaa1aa8f0d7c76, 573922f284a104aa786165ba40f78ea0, b8e3686fb9d103ae51a81bdf98f20383, e70e0c370301a5e3e7acab207c8343dc result, different first party: c8d55de186fc37cc8b087392acafa1e4, ccd012433a9abf82e8aaa1aa8f0d7c76, 573922f284a104aa786165ba40f78ea0, b8e3686fb9d103ae51a81bdf98f20383, e70e0c370301a5e3e7acab207c8343dc 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:4434/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); let text = await response.text(); // Empty response text indicates we are not connecting over h3: if (text.trim() === "") { throw new Error("Unsupported"); } } read: async () => { let response = await fetch(`https://h3.arthuredelstein.net:4434/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:4434/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); let text = await response.text(); // Empty response text indicates we are not connecting over h3: if (text.trim() === "") { throw new Error("Unsupported"); } } read: async () => { let response = await fetch(`https://h3.arthuredelstein.net:4434/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:4434/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); let text = await response.text(); // Empty response text indicates we are not connecting over h3: if (text.trim() === "") { throw new Error("Unsupported"); } } read: async () => { let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`); return await response.text(); } result, same first party: 114603d3641c5f7e0ebe9e3b38ef5492, 71b4b74c28ab427dad43cff34220ea96, b6adfddeee45aa209383a596ea2f1839, 82e0ca7452cd145041bc247ad62cf4b5, 949c7af0e29c3cfc9099690022503b9f result, different first party: 114603d3641c5f7e0ebe9e3b38ef5492, 71b4b74c28ab427dad43cff34220ea96, b6adfddeee45aa209383a596ea2f1839, 82e0ca7452cd145041bc247ad62cf4b5, 949c7af0e29c3cfc9099690022503b9f 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:4434/connection_id`, {cache: "no-store"}); await sleepMs(500); } // Are we now connecting over h3? let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`, {cache: "no-store"}); let text = await response.text(); // Empty response text indicates we are not connecting over h3: if (text.trim() === "") { throw new Error("Unsupported"); } } read: async () => { let response = await fetch(`https://h3.arthuredelstein.net:4434/connection_id`); return await response.text(); } result, same first party: 088b59f3867430d3418f1ab739bc68bf, 1d0a21b51d557a369949d38e831a7487, 03376d65b355d552fae1a8ca1a4766da, 160862135104391f3b462f92222c1c19 result, different first party: 088b59f3867430d3418f1ab739bc68bf, 1d0a21b51d557a369949d38e831a7487, 03376d65b355d552fae1a8ca1a4766da, 160862135104391f3b462f92222c1c19 unsupported: false, false, false, false passed: false, false, false, false test failed: false, false, false, false
HSTS cacheThe HTTP Strict-Transport-Security response header allows a website to signal that it should only be accessed via HTTPS. The browser remembers this directive in a database, but if this database is not partitioned, then it can be used to track users across websites."
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: null read: null result, same first party: , , , , result, different first party: HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected unsupported: , , , , passed: true, true, true, true, true test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Used http, Used http, Used http, Used http, Used http unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: null read: null result, same first party: , , , , result, different first party: HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected unsupported: , , , , passed: true, true, true, true, true test failed: false, false, false, false, false
  write: null read: null result, same first party: , , , , result, different first party: HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected, HTTPS used by default; no HSTS cache issue expected unsupported: , , , , passed: true, true, true, true, true test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Used http, Used http, Used http, Used http, Used http unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false passed: false, false, false, false test failed: 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: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); iframe.addEventListener("load", () => resolve(key), {once: true}); iframe.src = testURI("resource", "page", key); }) read: async (key) => { let iframe = document.createElement("iframe"); document.body.appendChild(iframe); let iframeLoadPromise = new Promise((resolve, reject) => { iframe.addEventListener("load", resolve, {once: true}); }); let address = testURI("resource", "page", key); iframe.src = address; await iframeLoadPromise; let response = await fetch( testURI("ctr", "page", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1 result, different first party: 2, 2, 2, 2 unsupported: false, false, false, false passed: true, true, true, true test failed: 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: 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, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: false, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: false, 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 result, different first party: 2, 2, 2, 2 unsupported: false, false, false, false passed: true, true, true, true test failed: 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: 4df4c3bb-6cc7-4412-82ba-37b5cfb2356d, 7fbf9eda-a8de-4368-92a0-e85aeb5de4ef, 63941ce3-63dc-41fb-a8df-021f745595b2, d25918bc-c60e-4a76-91c9-b3ed5a08ead1, f371ce46-4879-4ad0-8a27-38c1605c89d8 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: 87f05810-2062-4020-b3ba-8377655af51f, 0fae0703-a620-4a13-abf8-5e732184acc3, 9fca7080-7813-484b-b8f9-d9615f6c8fb5, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2, 99a6eb04-2293-437a-bb29-b7b19d317c4c 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: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 result, different first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 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: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e result, different first party: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e 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: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a result, different first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a 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: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b result, different first party: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations. result, different first party: Error: 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: 4f9e49b9-3ec8-4356-beb1-2a66dc9dfba7, 1325f524-cb6a-4e86-b9ea-bb0bedfd3d83, c099a13f-501e-49c8-8e9d-73eebf55f85e, 6343bec4-3e3c-4c5d-bc5a-c111f5e62ff4, 566f20a8-2d87-44c7-85e9-eb4551873500 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: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c result, different first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c 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: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c result, different first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations. result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e result, different first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e 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: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 result, different first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 unsupported: false, false, false, false passed: false, false, false, false test failed: 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: 4df4c3bb-6cc7-4412-82ba-37b5cfb2356d, 7fbf9eda-a8de-4368-92a0-e85aeb5de4ef, 63941ce3-63dc-41fb-a8df-021f745595b2, d25918bc-c60e-4a76-91c9-b3ed5a08ead1, f371ce46-4879-4ad0-8a27-38c1605c89d8 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: 87f05810-2062-4020-b3ba-8377655af51f, 0fae0703-a620-4a13-abf8-5e732184acc3, 9fca7080-7813-484b-b8f9-d9615f6c8fb5, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2, 99a6eb04-2293-437a-bb29-b7b19d317c4c 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: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 result, different first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 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: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e result, different first party: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e 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: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a result, different first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a 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: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b result, different first party: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b 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: fa4457e6-fa0e-4d7a-a64e-3e2dde02af51, 708bc16a-5f7d-4242-885b-a48b6ee9a8fd, 936452bc-b970-4719-801e-55a0d8aca8b4, 23dc6e85-b433-4f47-adb1-781fa2695d03, 0bfbb3f9-c9b7-475c-aa54-5b6f45737f76 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: 4f9e49b9-3ec8-4356-beb1-2a66dc9dfba7, 1325f524-cb6a-4e86-b9ea-bb0bedfd3d83, c099a13f-501e-49c8-8e9d-73eebf55f85e, 6343bec4-3e3c-4c5d-bc5a-c111f5e62ff4, 566f20a8-2d87-44c7-85e9-eb4551873500 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: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c result, different first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c 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: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c result, different first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c 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: b7d2ece2-e99c-4b12-8c6a-a5c74c8925b3, 3a9f1c74-c9e1-429f-b491-0254f9de8bf6, 967fdc00-6a31-4128-a322-f5fc3bde737c, 35d2963d-68fb-4a16-910d-aadfe226f005, 86ee6f09-2bc8-4ec6-b488-eb9ffe3d3e78 result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e result, different first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e 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: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 result, different first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 unsupported: false, false, false, false passed: false, false, false, false test failed: 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: 4df4c3bb-6cc7-4412-82ba-37b5cfb2356d, 7fbf9eda-a8de-4368-92a0-e85aeb5de4ef, 63941ce3-63dc-41fb-a8df-021f745595b2, d25918bc-c60e-4a76-91c9-b3ed5a08ead1, f371ce46-4879-4ad0-8a27-38c1605c89d8 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: 87f05810-2062-4020-b3ba-8377655af51f, 0fae0703-a620-4a13-abf8-5e732184acc3, 9fca7080-7813-484b-b8f9-d9615f6c8fb5, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2, 99a6eb04-2293-437a-bb29-b7b19d317c4c 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: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 result, different first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 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: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e result, different first party: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e 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: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a result, different first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a 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: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b result, different first party: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b 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: fa4457e6-fa0e-4d7a-a64e-3e2dde02af51, 708bc16a-5f7d-4242-885b-a48b6ee9a8fd, 936452bc-b970-4719-801e-55a0d8aca8b4, 23dc6e85-b433-4f47-adb1-781fa2695d03, 0bfbb3f9-c9b7-475c-aa54-5b6f45737f76 result, different first party: Error: LockManager.query: query() is not allowed in this context, Error: LockManager.query: query() is not allowed in this context, Error: LockManager.query: query() is not allowed in this context, Error: LockManager.query: query() is not allowed in this context, Error: LockManager.query: query() is not allowed in this context unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { if (navigator.locks) { navigator.locks.request(key, lock => new Promise((f,r) => {})); let queryResult = await navigator.locks.query(); return queryResult.held[0].clientId; } else { throw new Error("Unsupported"); } } read: async () => { if (navigator.locks) { let queryResult = await navigator.locks.query(); return queryResult.held[0].name; } } result, same first party: 4f9e49b9-3ec8-4356-beb1-2a66dc9dfba7, 1325f524-cb6a-4e86-b9ea-bb0bedfd3d83, c099a13f-501e-49c8-8e9d-73eebf55f85e, 6343bec4-3e3c-4c5d-bc5a-c111f5e62ff4, 566f20a8-2d87-44c7-85e9-eb4551873500 result, different first party: Error: queryResult.held[0] is undefined, Error: queryResult.held[0] is undefined, Error: queryResult.held[0] is undefined, Error: queryResult.held[0] is undefined, Error: queryResult.held[0] is undefined 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: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c result, different first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c 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: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c result, different first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c 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: 322e6245-f8e4-4adf-8cc7-0e73b030bd66, 3a9f1c74-c9e1-429f-b491-0254f9de8bf6, 967fdc00-6a31-4128-a322-f5fc3bde737c, 35d2963d-68fb-4a16-910d-aadfe226f005, 86ee6f09-2bc8-4ec6-b488-eb9ffe3d3e78 result, different first party: Error: LockManager.query: query() is not allowed in this context, Error: LockManager.query: query() is not allowed in this context, Error: LockManager.query: query() is not allowed in this context, Error: LockManager.query: query() is not allowed in this context, Error: LockManager.query: query() is not allowed in this context unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { if (navigator.locks) { navigator.locks.request(key, lock => new Promise((f,r) => {})); let queryResult = await navigator.locks.query(); return queryResult.held[0].clientId; } else { throw new Error("Unsupported"); } } read: async () => { if (navigator.locks) { let queryResult = await navigator.locks.query(); return queryResult.held[0].name; } } result, same first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e result, different first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e 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: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 result, different first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 unsupported: false, false, false, false passed: false, false, false, false test failed: false, false, false, false
prefetch cacheA suggests to browsers they should fetch a resource ahead of time and cache it. But if browsers don't partition this cache, it can be used to track users across websites.
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 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, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: false, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received result, different first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 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 result, different first party: 2, 2, 2, 2 unsupported: false, false, false, false passed: true, true, true, true test failed: 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: <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> 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: <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> 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: <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> 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: <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> result, different first party: b06b6d31-f5f0-4487-8325-98d63eed3699, , , , 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: <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> result, different first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: , , , , result, different first party: , , , , unsupported: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined result, different first party: Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: 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: <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> result, different first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, , , , 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: <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> result, different first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, , , , 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: <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> result, different first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, , , , 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: <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> , <html> <head><title>404 Not Found</title></head> <body> <center><h1>404 Not Found</h1></center> <hr><center>nginx/1.18.0 (Ubuntu)</center> </body> </html> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> <!-- a padding to disable MSIE and Chrome friendly error page --> result, different first party: , , , unsupported: false, false, false, false passed: true, true, true, true test failed: 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: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b result, different first party: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b 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: fa4457e6-fa0e-4d7a-a64e-3e2dde02af51, 708bc16a-5f7d-4242-885b-a48b6ee9a8fd, 936452bc-b970-4719-801e-55a0d8aca8b4, 23dc6e85-b433-4f47-adb1-781fa2695d03, 0bfbb3f9-c9b7-475c-aa54-5b6f45737f76 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: 4f9e49b9-3ec8-4356-beb1-2a66dc9dfba7, 1325f524-cb6a-4e86-b9ea-bb0bedfd3d83, c099a13f-501e-49c8-8e9d-73eebf55f85e, 6343bec4-3e3c-4c5d-bc5a-c111f5e62ff4, 566f20a8-2d87-44c7-85e9-eb4551873500 result, different first party: , Error: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: b7d2ece2-e99c-4b12-8c6a-a5c74c8925b3, 3a9f1c74-c9e1-429f-b491-0254f9de8bf6, 967fdc00-6a31-4128-a322-f5fc3bde737c, 35d2963d-68fb-4a16-910d-aadfe226f005, 86ee6f09-2bc8-4ec6-b488-eb9ffe3d3e78 result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined result, different first party: Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined, Error: SharedWorker is not defined unsupported: true, true, true, true passed: undefined test failed: 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: 8c95850c043afa34aeb914275bebc3074c462b51346a3cee3b74bb8a7c58b43c, 2c1925ed66a77940f4e95bf6c580d3f072e2ff77a1b5e03d0b3eeeeb372dbc77, de587b90480f2fb05fe4d1f437f579cd21761b9286faa4bc421a3322b1ba89f6, 00b4709f8ac59c1e8c38d13c257f845ef6bebb358c43bcf44d22c5d8f027df15, c8c3ec112ecc7ff18debd004d88fd820f59396dcdee78ee40eb248c91db1f1a3 result, different first party: bf96580fee2d0eeb30112e3b5b855f0403638aaf56c04a364eadb3fa60a1ff17, 1d3a5ff054eb5527962e7daa1507d449b0405f25f145bde9f7feab3eda334a0e, 1ccfad3fe012b7ce30ad228e4316de42d1cadc108bdc3a7bb25937f7a34ab029, 1e92a245bae47f40c742994ab515ae52aaa5c23ae27d7a30245b060785a943b9, 7592118eaae2b691279f4bcc46d876797f3699958a84160afc74e121148b6d40 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: 3c9122bb276b2f826708df5a440db95f7c857529687b3187d2c783f5966fa8c9, 7180c1aaaf623165af7cc982bbf6fd9ab6320f7e4204cbf862dd3403e3a752e2, 040fb854379dc72b703a0b335f9c37caa56dfdfc0774f6f389a5ab683863038f, a6ae92ee1b4fa8ac20a42255aebe09abee00263ba871fabe012b0549402006b5, 295e658624d106b5989483661b27486168526fc4a9d7dc317f30b126c35fa599 result, different first party: de4e13f113d785f94326043356035177044cafc1a7b67b9f3d6b6a5dddd927ee, cabc3d0d84d64072256cdcf6915482ecbad82f0c90fa8810f4b9f4452da81358, 7ee6e5aad79549ee08d548f11ffd830ce1abae4e19c91471aaaadb00f24b53ae, a22d770c2e5889d227482f2f16891ede9bc136753fe327b60ea39a8a623bc2b1, 5a03ca7f2416465b75120e7cf99768efabbba7de35391417e4401720a4fd93a0 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: c190a41247ed834645cf974dbd66eedf299424504a2b291a0065e7d2b7277c78, 354ac5014df6bda0afa71a08ece282483dc76ffde62116884215dfd181e97c3b, 451aed0aa10c3a2e0fac826e79c908b2086abf4bc29ea41a91e5fad0acbac1dd, 58e1e6c7a34527c584c10ff7d8843e08f9182cc1edbf5909d33805884e58a499, 0c5fc4bcf8b640d0ff8f796f226cef596705193283efbcb6ecbffcfd98f4a0c0 result, different first party: dcb45015e818cdca1c4d242b9885e9011f85efd84df46846e8bb63b063a800fd, 0bfd7356d385c365be78ce4b1a5bd4eed69269c648378b0669727c3e27067768, b0a00f93c139c6abf52205cae407e04121b96503ab9228c1fff0d39ef33f7ba8, d1dd6d66cce5e736869a746950a395b670232e825953f9b5f4dee8a85c2db026, eebb3c680c3f9c64a3817a5489bf8abfaa1bbf47154bb73192131c35c12e7bac 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: 608d90683f3991d18c667e3fdf1d9094afc3718e8bc01800043bfacc19e7ea05, 3bede6c202b2f9efc50448bce1d99428b7682288557c0ac6644c6e71de3096f7, fdebfef3ea87348abd48b8ea57106cec58bf13905695c6377b7bdc77abac7432, 50f4702d1c03afdff35cdc9899c3e6b31b072d6b4cedc1d7f78f6bdd4d976228, 7ef1b8d8e3d8b07eefb418fbef7918f34b6eb0378a626648f527a1e33db73e6d result, different first party: 25d02206daa3264841b532cefaac1a12e3e8560b3a8526f68a33e174ac4b58d6, d82decf093d85d48560ba7b92a271c8568ae1a1a57af2b47c63cfe387f3e5898, 964b5dc938ae6e82de927af788fa9a8734898ad0e4281d73e1bbc9fa55d6f0d3, 19bfd236e6d5fe5f7a78942a431341022bc866368c899f1d4b03d1b14d72edf7, f042dfe45dac7489825e4f7f74946f0d267a5e2855e4d8c1766ede07fc59bab9 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: 28994e48e9d09040d74ec53b343cdd98eb9420eae56e2a5e2dcfc8d64516b80a, f8f8bebb827a8ad3986dd779a95783a57dfcabf4b9e06cf7bed1c6648f69924f, 9255ee127b49e48a96ceefc16b2b00ea75f344e437277cbc7e0c40b9cc4330a5, 4eb1b96b31c784bca9a09543e59cb5d5f1b5ffb470ee6e1ea79cd5d8cc7ed941, 082bdcbe35b6fb759fecbd2978b49dc986048a4ae0ba5e51bda195c963637ca2 result, different first party: c460b92c0971c356439fc3333ec2bcb782dfa06de75eeb830068ddafb3f3323f, 1f1db679e02ef97baa77159a52e68537d48309061213bb2e0d3f2140ac00f317, 6f35923cf2387655ef0c75b00a702d155063035e7dc402a50aa27935c1f053ed, c9bc5dddabef346667fc7d9d13dea9ce44eabf3f72131503cf44c9dfe1a2fc0e, eb21ed36bef45cadfbf3bf216b499012ad759af77483bd07de39756f4ea7797a 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: 34428e812322d508da1b710a63085e086777d8805a14457a35ceb5da36067730, 41a9f3032d61568775c571ad80a2e8d11ef1bba9ba911a44f38719c689bb7e1d, f96f5b59694ab549e70f7397df489a03df6c49f8001e96b176f6babc02c53da3, d17bd1c586b21211ef35b2501d47a2679b03c206370f8866d9d2f958022c9705, 53cc105d57e6e88572d20968db9fcad25f75ac071ec44b669295a0a4dcac20f0 result, different first party: 3894914bcce73277f11a1bd91dc81c7db7d98493380288724d50d93b65279d53, 3c40c0af02b8369c2f1c48cf208c5faf51489e38dba0ac222eebdf57e3913be3, bfe4339a485d10e7b0755364ceb03a4bc9d16be94539704851ccace509e5caac, 02784dc806064467b02077d1cd3f35a93222b1b994327f00ab80c7551fd54e05, b87a9a7950df6ff7691920539fc6dd732e4202ba9815b35f628f48d7abdeca08 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: c220d867c329b22e2d2e39da35b575fc33ef09fe1ca14d3ff1da7c1a6f2a5f4e, 46b7c6a2ec1fcdde0a701b9cc9a7ed52212ee30927664afdc990f2b1a0bb608d, e2c8ab55c7439ce5c45b831c5c1701e0ad9decfdd21ccee96301f0f779cf7af3, 57d914f102bab9dc934135b2caf51ae54c7a2de351846aa44963ad5072c02ba0, f198a4d507c2fe79e9f21b9a3c46906b088e8d3911865445b3e2ca84ed1c666e result, different first party: 9f1819fa844ebdec61a7b10b0949fa47797194350661b2f46d5a01365f6469e1, 26417728d6c78ff4f5e3218f4ef95c273b4b05d32b09f982b0ad138cdd2257e0, 5e0bdc2394cecc514648122bed9841c4ffb56c76f375f24bbdeb72c55d1b62b2, 3d20ac0b7268198d413e29a50082ed383c785e01af1ed4f95b950b9e8a6ba50d, 4674b9adf2c47e6681d2570d2fcf07ba5843c71f79b66074732b1cfc253ab9fa 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: c6f04c9542cdcb73d7bd6c11c291f8cd505fe7fc32d22908e36ee7b593a339ed, f48396928b52abe769b247ba5fab2cadc43b553bef5a83253126959dac138761, a09e66b817857653b07835f9edd4c9769fc4b48dfb3326cd2be7783d9757876c, 9d6f3d6f51c05c7e41a6557b9713b3fe1f78a2e2bcb1d47be03935565adbe9d0, fa0cbae8f16813082309ab4b3fc3cf22992e6e6d8d72fd62cd0b870e331caf3e result, different first party: bab35dfcfa1b4294070fe8be064ed8492dd3182a54e58be0c40b5993f72ef070, 76b9faabd55af72eb04507b7fd8eb4c787fcbcae24bebb258ee42d05da4fb8ed, b63e1587f69f3d8b2c6175e0ce9387aaa5951d1405d70a28d86e67fbc1fa05f9, c3b6d7899cea08322b5facde841e2a8065af4f4ea2ac2f46783670bf82bfe67d, 547817307b33adcb2f97863ebba95ccf1a56de26f91c21324cd55245be63d98e 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: ac06249d97ee734e734139d552e67e11f6702e24a6016b67ee976f1fd3467d99, 1548a6e2d205ddce786a42faef5e533667aeb6cf34c123ce29cf06177c14093c, 73c591b196f989367bb07415ebfa1f980c498ee40db219247769c500a16aae9e, aadb0bfd4c28a448e3b37eb202bd001a1f828938b26a7404266698af83381006, d93231a2597eaf3977fb7f192a06bf6fcfefb7657cf7ff3a84bf88152cb441ed result, different first party: 34196688a5e8e44eb20572d9a3c2e49ba3824f7a7531019378bb3c0b5907d5ae, 8acd9855f7573194b7f5df01dd8f080adb64283d4e28ad67def917218479e9e9, 6e91ad4ff534dc1982657a805c5caf5f2c4bf3bd73a47fd67e67d91c3bcfdb00, 020b0122d43311cb04ce252907a4d8f087f81e083e7339932336b76a264c4adb, dfcc5160fcdb37b7f9dd83ab1cecd6eb0548a1bda3df63d603c50f4b7f62c892 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: 74fd574bd544df3d6b1b8780dee848110d98d38d73f1af47531641410b62ec10, 619470de719e3c4bb3a7d153b2646fd173c97a55068a70b804111ade7b828a5a, 933e5638c1a3abdd3b34a1defc242d2ab49e3f9e958d2377151de293caea47b3, 0db8a01a72e0d001b33ffdbf8ea18abd8bc62057caa17b79a209dcfa0526cb70, 7cfdd15ae7611792d479f63c950f89b01a66fc5e90cad8b1d4457c2bf3f3beab result, different first party: 01616ca9bcdc38198c58282dc973f9bfcb3c9b4791579a21f72d583d0e7d340f, 20308f8a364f57c4196a542fa5f0cb99916b941ead6b41e8298fded7d545d97a, 8409b03aa23af7f82310f8260740275a3a09b1722a2d864dc597dc88bf798459, dbce5dfad22a28d79960518ccf62e376f5631c925a6c990a06611ebb415acc8b, 64cbb8cc973fe5655528a24aa8dac0997620c1d5a9a99f040b384bb752326cf6 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: 3131d5cb73a6d165f8471e7c72ba405d74a8afb639657e949a6a721d10fed889, 120ea6c067f21aece4e17eaca3c6a27a4ad0628e661b38c98ed74158a48446c8, 3c2ff669edfbd47691736080c63e745dc381238f33d9ab4aef20a4613b4159fc, 0ea924ecdc60fa8e34fc8c41883d80eceaec67b4b74731c4b016b985e01da094, 4c4ea4866972acd773bfae7ee55a47a3f9092ddec08dc43cb92e3ab5bc01192f result, different first party: a9288c04f1e9ffbaa54e4b0008985e8e1eb977ef7869617cec1b5e1985dc8a6b, 509303469288dad65ce7e8bd16997c7cef6d4ca429b38af79e626bdaa651be69, 34b292dffe902254651cf9e3e957cfe08234adcd1493c38cd031b93132704d52, 7d0ce5493bcec5fdcce3ec2bdede72de683a34d2873e137d7ceb5b28688b6e8c, 3bb5c7f8db87476b3e8a526ee3204511bf7b94f7ae543799adb77dd469d7e106 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: 4b4d496b42d8c5fcf9bcd000dbe1940e513976960de8c3623c9cee2ed816fb93, 0af82d5517a9c1aaeee505610d0f029e7bff401a6e2eacc4cca5bfe24394f06c, ea9adf5cfa75233f16bb614ed926173f18ea0589948a1316fe160e180c149f5b, d0d94001eb44486baf67cb8dd08565563a6b8a7e6e781d9ce116c60e25e3f38c, 855b027db5a9e3d670b3c6f8ba0b089cf66df4f376b15b5b46f07d1233eef6c6 result, different first party: c7cc0a6a78ba8b5f8be04d71b0d068e8a15de2b02d2b2cb773d39715db2b990d, 34c9a4049b3ba7a6aee6900c1acaaec657e5868b611c033363b485b5bd849747, a2321a1af2dc20398338a5d5fe95b284c4bd50d3aa0a15298486a5a064b8c1ea, c0f60ed9bf4c7fb10132aeb8eb67a792e0f9fd7f2b1f8c7136d5c68fb9f47847, 6b97b083a6b6ab944932bd9a7f4717138129c54bd6894485eaa71833e5c9cb3f 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: 5319b15fa08cb4d3c7c9fcd1d110720dda5585cfc73aabbc49620feecc1bf71d, 1ed49252e4b96411a95a07766cd9af83e5c554e64492817a2071e9dafd0ac4c9, 7fc754402ce92d060b5db7ce18c2b14f0f331dc05908c704516d430b1658faaa, ad060e5634dfd34db279274c23dcf90249fe1751af0cc9d667aea0c82b63c191 result, different first party: 810c6f8949a85b388a56837e88af2203f818d7637f88039193572c4f60ce6c4b, 9d511797e9b6d3fb6f9a7398f65b32ddb34875fa7dada95672094398543e51bf, be0204eed953f87b44f5d79e51586b4ceafd0ee2e1b494bbd51240a08ac8f01b, 6483250f926111c902c3ec9e1e4e80e31089f86d6677bc0ff4c84f2f303a8f37 unsupported: false, false, false, false passed: true, true, true, true test failed: 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("gported"); } 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: 4df4c3bb-6cc7-4412-82ba-37b5cfb2356d, 7fbf9eda-a8de-4368-92a0-e85aeb5de4ef, 63941ce3-63dc-41fb-a8df-021f745595b2, d25918bc-c60e-4a76-91c9-b3ed5a08ead1, f371ce46-4879-4ad0-8a27-38c1605c89d8 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("gported"); } 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: 87f05810-2062-4020-b3ba-8377655af51f, 0fae0703-a620-4a13-abf8-5e732184acc3, 9fca7080-7813-484b-b8f9-d9615f6c8fb5, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2, 99a6eb04-2293-437a-bb29-b7b19d317c4c 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("gported"); } 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: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 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("gported"); } 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: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!window.openDatabase) { throw new Error("gported"); } 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: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a 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("gported"); } 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: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!window.openDatabase) { throw new Error("gported"); } 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: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!window.openDatabase) { throw new Error("gported"); } 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: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!window.openDatabase) { throw new Error("gported"); } 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: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c 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("gported"); } 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: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c result, different first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c 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("gported"); } 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: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!window.openDatabase) { throw new Error("gported"); } 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: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e 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("gported"); } 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: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 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. unsupported: false, false, false, false passed: true, true, true, true test failed: false, false, false, false
XMLHttpRequest cacheSimilar to the newer Fetch API, any resource received may be cached by the browser. The cache is potentially vulnerable to cross-site tracking attack.
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; return key; } read: async (key) => { const req = new XMLHttpRequest(); const loadPromise = new Promise(resolve => req.addEventListener("load", resolve)); req.open("GET", testURI("resource", "xhr", key)); req.send(); await loadPromise; let countResponse = await fetch(testURI("ctr", "xhr", key), {cache: "reload"}); return (await countResponse.text()).trim(); } result, same first party: 1, 1, 1, 1 result, different first party: 2, 2, 2, 2 unsupported: false, false, false, false passed: true, true, true, true test failed: 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: () => document.referrer 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: () => document.referrer 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: () => document.referrer 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: () => document.referrer 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: () => document.referrer 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: () => document.referrer 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: () => document.referrer 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: () => document.referrer result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ 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) => { /* do nothing */ } read: () => document.referrer 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: () => document.referrer 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: () => document.referrer 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: () => document.referrer 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: () => document.referrer result, same first party: 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/ unsupported: false, false, false, false passed: false, false, false, false test failed: 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: 4df4c3bb-6cc7-4412-82ba-37b5cfb2356d, 7fbf9eda-a8de-4368-92a0-e85aeb5de4ef, 63941ce3-63dc-41fb-a8df-021f745595b2, d25918bc-c60e-4a76-91c9-b3ed5a08ead1, f371ce46-4879-4ad0-8a27-38c1605c89d8 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: 87f05810-2062-4020-b3ba-8377655af51f, 0fae0703-a620-4a13-abf8-5e732184acc3, 9fca7080-7813-484b-b8f9-d9615f6c8fb5, 47bf976b-63ca-42c1-b0c6-f3e38c9accd2, 99a6eb04-2293-437a-bb29-b7b19d317c4c 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: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 result, different first party: d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, eaf075c4-07fd-4bbc-9dde-0aa314af64e3, c93d27a0-0378-46a2-a020-56d9dcb0f6e8, b1ff2109-eb06-4b39-858c-0bd2bf1299ad, 68577d6f-a132-4dae-8b41-45963e05a674 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: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e result, different first party: b06b6d31-f5f0-4487-8325-98d63eed3699, 62faf6e5-4601-433a-a05f-1d642e49d6a7, c23de529-1643-4de0-995f-fb6dfa6f50df, 381060ba-e4e8-4da3-be58-9e803628aa82, 4dea3232-6094-417f-8325-01f535e9ad8e 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: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a result, different first party: e04659bd-a1bb-4b11-bfdd-20124cf9a663, b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, 16a0309b-9981-4a65-a3de-495300c5ea0e, 66dca488-c132-477e-835c-88bb8803291a, f19c95f7-5fda-4249-b3c6-5b13d020317a 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: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b result, different first party: 749d1c56-a847-45bc-9288-717e3f5b68b0, f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, bd945ba5-3105-4474-848a-e5d39a3a43a9, 94dadc41-b57d-4efb-bb2f-123db8a3c423, 243bbf0f-9a75-4696-b8d5-b19d89ade08b 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: fa4457e6-fa0e-4d7a-a64e-3e2dde02af51, 708bc16a-5f7d-4242-885b-a48b6ee9a8fd, 936452bc-b970-4719-801e-55a0d8aca8b4, 23dc6e85-b433-4f47-adb1-781fa2695d03, 0bfbb3f9-c9b7-475c-aa54-5b6f45737f76 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: 4f9e49b9-3ec8-4356-beb1-2a66dc9dfba7, 1325f524-cb6a-4e86-b9ea-bb0bedfd3d83, c099a13f-501e-49c8-8e9d-73eebf55f85e, 6343bec4-3e3c-4c5d-bc5a-c111f5e62ff4, 566f20a8-2d87-44c7-85e9-eb4551873500 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: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c result, different first party: 75fd2b89-d207-4d20-9edf-dd7c5e493504, 4dcf9278-e628-43ef-937d-8fb0c2af9668, c7687444-26c4-4e11-95cd-7dd150dcae2b, 0a3d8601-ef6b-454d-9fcb-54b9a494b768, e70907ff-755e-41ab-a68e-9ef78d37237c 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: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c result, different first party: b93b14fd-602d-4f1d-bae9-3ab46b62a581, bc5106e1-0a46-4af8-be1c-c3402db8492f, 2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, 54057180-98aa-497e-8549-249ba617cad5, ff768cb3-c84c-46d1-8377-e45b292b3b5c 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: b7d2ece2-e99c-4b12-8c6a-a5c74c8925b3, 3a9f1c74-c9e1-429f-b491-0254f9de8bf6, 967fdc00-6a31-4128-a322-f5fc3bde737c, 35d2963d-68fb-4a16-910d-aadfe226f005, 86ee6f09-2bc8-4ec6-b488-eb9ffe3d3e78 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: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e result, different first party: c479dc23-ada1-4de3-b599-ddbd0c93e2e1, f5d57249-2542-4421-8060-3d10dd1ba280, 049cfcf2-16d0-4ceb-84b8-f9fd2de17977, 4a492d07-dfda-417b-9332-eac5837573af, f107c6aa-ce4c-488e-b6d6-d11458af932e 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: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 result, different first party: fcf36622-6de3-42d4-bca4-7ea6015d07c5, 852005f8-633b-4a09-8466-65b2464683d8, 73a873af-a746-4c62-ad4e-96a260486458, 7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 unsupported: false, false, false, false passed: false, false, false, false test failed: 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) => window.name = "name_" + secret read: () => window.name result, same first party: name_4df4c3bb-6cc7-4412-82ba-37b5cfb2356d, name_7fbf9eda-a8de-4368-92a0-e85aeb5de4ef, name_63941ce3-63dc-41fb-a8df-021f745595b2, name_d25918bc-c60e-4a76-91c9-b3ed5a08ead1, name_f371ce46-4879-4ad0-8a27-38c1605c89d8 result, different first party: name_4df4c3bb-6cc7-4412-82ba-37b5cfb2356d, name_7fbf9eda-a8de-4368-92a0-e85aeb5de4ef, name_63941ce3-63dc-41fb-a8df-021f745595b2, name_d25918bc-c60e-4a76-91c9-b3ed5a08ead1, name_f371ce46-4879-4ad0-8a27-38c1605c89d8 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => window.name = "name_" + secret read: () => window.name result, same first party: name_87f05810-2062-4020-b3ba-8377655af51f, name_0fae0703-a620-4a13-abf8-5e732184acc3, name_9fca7080-7813-484b-b8f9-d9615f6c8fb5, name_47bf976b-63ca-42c1-b0c6-f3e38c9accd2, name_99a6eb04-2293-437a-bb29-b7b19d317c4c result, different first party: name_87f05810-2062-4020-b3ba-8377655af51f, name_0fae0703-a620-4a13-abf8-5e732184acc3, name_9fca7080-7813-484b-b8f9-d9615f6c8fb5, name_47bf976b-63ca-42c1-b0c6-f3e38c9accd2, name_99a6eb04-2293-437a-bb29-b7b19d317c4c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => window.name = "name_" + secret read: () => window.name result, same first party: name_d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, name_eaf075c4-07fd-4bbc-9dde-0aa314af64e3, name_c93d27a0-0378-46a2-a020-56d9dcb0f6e8, name_b1ff2109-eb06-4b39-858c-0bd2bf1299ad, name_68577d6f-a132-4dae-8b41-45963e05a674 result, different first party: name_d50bc62a-80d8-4db4-a6a7-d1a56d61b30c, name_eaf075c4-07fd-4bbc-9dde-0aa314af64e3, name_c93d27a0-0378-46a2-a020-56d9dcb0f6e8, name_b1ff2109-eb06-4b39-858c-0bd2bf1299ad, name_68577d6f-a132-4dae-8b41-45963e05a674 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => window.name = "name_" + secret read: () => window.name result, same first party: name_b06b6d31-f5f0-4487-8325-98d63eed3699, name_62faf6e5-4601-433a-a05f-1d642e49d6a7, name_c23de529-1643-4de0-995f-fb6dfa6f50df, name_381060ba-e4e8-4da3-be58-9e803628aa82, name_4dea3232-6094-417f-8325-01f535e9ad8e result, different first party: name_b06b6d31-f5f0-4487-8325-98d63eed3699, name_62faf6e5-4601-433a-a05f-1d642e49d6a7, name_c23de529-1643-4de0-995f-fb6dfa6f50df, name_381060ba-e4e8-4da3-be58-9e803628aa82, name_4dea3232-6094-417f-8325-01f535e9ad8e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => window.name = "name_" + secret read: () => window.name result, same first party: name_e04659bd-a1bb-4b11-bfdd-20124cf9a663, name_b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, name_16a0309b-9981-4a65-a3de-495300c5ea0e, name_66dca488-c132-477e-835c-88bb8803291a, name_f19c95f7-5fda-4249-b3c6-5b13d020317a result, different first party: name_e04659bd-a1bb-4b11-bfdd-20124cf9a663, name_b2ce7248-03f2-45c3-95e6-e5cc7b9e2c65, name_16a0309b-9981-4a65-a3de-495300c5ea0e, name_66dca488-c132-477e-835c-88bb8803291a, name_f19c95f7-5fda-4249-b3c6-5b13d020317a unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => window.name = "name_" + secret read: () => window.name result, same first party: name_749d1c56-a847-45bc-9288-717e3f5b68b0, name_f0a917c7-7c55-47e8-8f31-eb34ae06e9ee, name_bd945ba5-3105-4474-848a-e5d39a3a43a9, name_94dadc41-b57d-4efb-bb2f-123db8a3c423, name_243bbf0f-9a75-4696-b8d5-b19d89ade08b 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) => window.name = "name_" + secret read: () => window.name result, same first party: name_fa4457e6-fa0e-4d7a-a64e-3e2dde02af51, name_708bc16a-5f7d-4242-885b-a48b6ee9a8fd, name_936452bc-b970-4719-801e-55a0d8aca8b4, name_23dc6e85-b433-4f47-adb1-781fa2695d03, name_0bfbb3f9-c9b7-475c-aa54-5b6f45737f76 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) => window.name = "name_" + secret read: () => window.name result, same first party: name_4f9e49b9-3ec8-4356-beb1-2a66dc9dfba7, name_1325f524-cb6a-4e86-b9ea-bb0bedfd3d83, name_c099a13f-501e-49c8-8e9d-73eebf55f85e, name_6343bec4-3e3c-4c5d-bc5a-c111f5e62ff4, name_566f20a8-2d87-44c7-85e9-eb4551873500 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) => window.name = "name_" + secret read: () => window.name result, same first party: name_75fd2b89-d207-4d20-9edf-dd7c5e493504, name_4dcf9278-e628-43ef-937d-8fb0c2af9668, name_c7687444-26c4-4e11-95cd-7dd150dcae2b, name_0a3d8601-ef6b-454d-9fcb-54b9a494b768, name_e70907ff-755e-41ab-a68e-9ef78d37237c result, different first party: name_75fd2b89-d207-4d20-9edf-dd7c5e493504, name_4dcf9278-e628-43ef-937d-8fb0c2af9668, name_c7687444-26c4-4e11-95cd-7dd150dcae2b, name_0a3d8601-ef6b-454d-9fcb-54b9a494b768, name_e70907ff-755e-41ab-a68e-9ef78d37237c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => window.name = "name_" + secret read: () => window.name result, same first party: name_b93b14fd-602d-4f1d-bae9-3ab46b62a581, name_bc5106e1-0a46-4af8-be1c-c3402db8492f, name_2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, name_54057180-98aa-497e-8549-249ba617cad5, name_ff768cb3-c84c-46d1-8377-e45b292b3b5c result, different first party: name_b93b14fd-602d-4f1d-bae9-3ab46b62a581, name_bc5106e1-0a46-4af8-be1c-c3402db8492f, name_2ab9104e-e8e4-4bbe-828e-a11f5284e5d3, name_54057180-98aa-497e-8549-249ba617cad5, name_ff768cb3-c84c-46d1-8377-e45b292b3b5c unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => window.name = "name_" + secret read: () => window.name result, same first party: name_b7d2ece2-e99c-4b12-8c6a-a5c74c8925b3, name_3a9f1c74-c9e1-429f-b491-0254f9de8bf6, name_967fdc00-6a31-4128-a322-f5fc3bde737c, name_35d2963d-68fb-4a16-910d-aadfe226f005, name_86ee6f09-2bc8-4ec6-b488-eb9ffe3d3e78 result, different first party: name_b7d2ece2-e99c-4b12-8c6a-a5c74c8925b3, name_3a9f1c74-c9e1-429f-b491-0254f9de8bf6, name_967fdc00-6a31-4128-a322-f5fc3bde737c, name_35d2963d-68fb-4a16-910d-aadfe226f005, name_86ee6f09-2bc8-4ec6-b488-eb9ffe3d3e78 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => window.name = "name_" + secret read: () => window.name result, same first party: name_c479dc23-ada1-4de3-b599-ddbd0c93e2e1, name_f5d57249-2542-4421-8060-3d10dd1ba280, name_049cfcf2-16d0-4ceb-84b8-f9fd2de17977, name_4a492d07-dfda-417b-9332-eac5837573af, name_f107c6aa-ce4c-488e-b6d6-d11458af932e result, different first party: name_c479dc23-ada1-4de3-b599-ddbd0c93e2e1, name_f5d57249-2542-4421-8060-3d10dd1ba280, name_049cfcf2-16d0-4ceb-84b8-f9fd2de17977, name_4a492d07-dfda-417b-9332-eac5837573af, name_f107c6aa-ce4c-488e-b6d6-d11458af932e unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => window.name = "name_" + secret read: () => window.name result, same first party: name_fcf36622-6de3-42d4-bca4-7ea6015d07c5, name_852005f8-633b-4a09-8466-65b2464683d8, name_73a873af-a746-4c62-ad4e-96a260486458, name_7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 result, different first party: name_fcf36622-6de3-42d4-bca4-7ea6015d07c5, name_852005f8-633b-4a09-8466-65b2464683d8, name_73a873af-a746-4c62-ad4e-96a260486458, name_7fa9cc2d-cb29-4b5f-abbf-b3e5c755ec25 unsupported: false, false, false, false passed: false, false, false, false test failed: 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: true,true,true,true,true result: Insecure website never loaded,Insecure website never loaded,Insecure website never loaded,Insecure website never loaded,Insecure website never loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: true,true,true,true,true result: Insecure website never loaded,Insecure website never loaded,Insecure website never loaded,Insecure website never loaded,Insecure website never loaded
  passed: true,true,true,true,true result: Insecure website never loaded,Insecure website never loaded,Insecure website never loaded,Insecure website never loaded,Insecure website never loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false result: 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: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false passed: 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: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false passed: false,false,false,false
Upgradable imageChecks to see if the browser attempts to upgrade an insecure address for an image to HTTPS whenever possible.
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: false,false,false,false,false result: loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: false,false,false,false,false result: loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely,loaded insecurely
  passed: 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: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true result: 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: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true,true result: upgraded,upgraded,upgraded,upgraded,upgraded
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true,true result: blocked,blocked,blocked,blocked,blocked
  passed: true,true,true,true result: blocked,blocked,blocked,blocked
Misc testsThis category includes tests for the presence of miscellaneous privacy features.
GPC enabled first-partyThe Global Privacy Control is an HTTP header that can be sent by a browser to instruct a website not to sell the user's personal data to third parties. This test checks to see if the GPC header is sent by default to the top-level website.
  header value: 1 passed: true,true,true,true,true
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: 1 passed: true,true,true,true,true
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false,false
  header value: undefined passed: false,false,false,false
GPC enabled third-partyThe Global Privacy Control is an HTTP header that can be sent by a browser to instruct a visited website not to sell the user's personal data to other parties. This test checks to see if the GPC header is sent to third-party elements on the web page.
  sec-gpc: 1 passed: true,true,true,true,true
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false
IP address leakIP addresses can be used to uniquely identify a large percentage of users. A proxy, VPN, or Tor can mask a user's IP address.
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: true,true,true,true,true
  passed: false,false,false,false,false
  passed: false,false,false,false
Stream isolationBrowsers that use Tor can use a different Tor circuit per top-level website.
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: 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,true readSameFirstParty: 193.31.24.154,2a06:d380:0:103::62,2602:fc05::42,2a0b:f4c2:2::58,2a0b:f4c2:2::32 readDifferentFirstParty: 2a0b:f4c1:2::250,162.247.74.200,2a00:11c0:1b:aa2::5,2a0b:f4c2:2::60,185.16.38.110 passed: true,true,true,true testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false
Tor enabledThe Tor network sends the browser's web requests through a series of relays to hide a user's IP address, thereby helping to mask their identity and location. This test checks to see if the Tor network is being used by default.
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: true,true,true,true,true passed: true,true,true,true,true
  IsTorExit: false,false,false,false,false passed: false,false,false,false,false
  IsTorExit: false,false,false,false passed: 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: 640,640,640,640,640 desired value: 1263,1263,1263,1263,1263 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1677,1677,1677,1677,1677 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: undefined desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1416,1416,1416,1416,1416 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: undefined desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1285,1285,1285,1285,1285 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 640,640,640,640 desired value: 1416,1416,1416,1416 passed: false,false,false,false
Media query screen widthWidth of the user's screen in pixels.
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 980,980,980,980,980 desired value: 980,980,980,980,980 passed: true,true,true,true,true
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 980,980,980,980,980 desired value: 980,980,980,980,980 passed: true,true,true,true,true
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 360,360,360,360 desired value: 980,980,980,980 passed: false,false,false,false
outerHeightHeight of the browser window in pixels, including browser chrome.
  expression: outerHeight desired expression: innerHeight actual value: 464,464,464,464,464 desired value: 1263,1263,1263,1263,1263 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 560,560,560,560,560 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 560,560,560,560,560 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 616,616,616,616,616 desired value: 1677,1677,1677,1677,1677 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 512,512,512,512,512 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 616,616,616,616,616 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 616,616,616,616,616 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1524,1524,1524,1524,1524 desired value: 1524,1524,1524,1524,1524 passed: true,true,true,true,true
  expression: outerHeight desired expression: innerHeight actual value: 512,512,512,512,512 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 520,520,520,520,520 desired value: 1416,1416,1416,1416,1416 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1524,1524,1524,1524,1524 desired value: 1524,1524,1524,1524,1524 passed: true,true,true,true,true
  expression: outerHeight desired expression: innerHeight actual value: 472,472,472,472,472 desired value: 1285,1285,1285,1285,1285 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 520,520,520,520 desired value: 1416,1416,1416,1416 passed: false,false,false,false
screen.heightHeight of the user's screen, in pixels.
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1263,1263,1263,1263,1263 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1677,1677,1677,1677,1677 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1524,1524,1524,1524,1524 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1524,1524,1524,1524,1524 desired value: 1524,1524,1524,1524,1524 passed: true,true,true,true,true
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1394,1394,1394,1394,1394 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1416,1416,1416,1416,1416 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1524,1524,1524,1524,1524 desired value: 1524,1524,1524,1524,1524 passed: true,true,true,true,true
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640,640 desired value: 1285,1285,1285,1285,1285 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 640,640,640,640 desired value: 1416,1416,1416,1416 passed: false,false,false,false
screen.widthWidth of the user's screen, in pixels.
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 980,980,980,980,980 desired value: 980,980,980,980,980 passed: true,true,true,true,true
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 980,980,980,980,980 desired value: 980,980,980,980,980 passed: true,true,true,true,true
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360,360 desired value: 980,980,980,980,980 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 360,360,360,360 desired value: 980,980,980,980 passed: false,false,false,false
screenXPosition, in pixels, of the left edge of the browser window on screen.
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0 desired value: 0,0,0,0 passed: true,true,true,true
screenYPosition, in pixels, of the top edge of the browser window on screen.
  expression: screenY desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenY desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenY desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenY desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenY desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenY desired expression: 0 actual value: 24,24,24,24,24 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 80,80,80,80,80 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenY desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenY desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenY desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenY desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenY desired expression: 0 actual value: 0,0,0,0 desired value: 0,0,0,0 passed: true,true,true,true
Tracking query parameter testsWhen you browse from one web page to another, tracking companies will frequently attach a 'tracking query parameter' to the address of the second web page. That query parameter may contain a unique identifier that tracks you individually as you browse the web. And these query parameters are frequently synchronized with cookies, making them a powerful tracking vector. Web browsers can protect you from known tracking query parameters by stripping them from web addresses before your browser sends them. (The set of tracking query parameters tested here was largely borrowed from Brave.)
__hsfpHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
__hsscHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
__hstcHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
__sDrip.com email address tracking parameter
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
_hsencHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
_openstatYandex tracking parameter
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
dclidDoubleClick Click ID (Google)
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
fbclidFacebook Click Identifier
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
gclidGoogle Click Identifier
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
hsCtaTrackingHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
igshidInstagram tracking parameter
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
mc_eidMailchimp Email ID (email recipient's address)
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
mkt_tokAdobe Marketo tracking parameter
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
ml_subscriberMailerLite email tracking
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
ml_subscriber_hashMailerLite email tracking
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
msclkidMicrosoft Click ID
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
oly_anon_idOmeda marketing 'anonymous' customer id
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
oly_enc_idOmeda marketing 'known' customer id
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
rb_clickidUnknown high-entropy tracking parameter
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
s_cidAdobe Site Catalyst tracking parameter
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
vero_convVero tracking parameter
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
vero_idVero tracking parameter
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
wickedidWicked Reports e-commerce tracking
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
yclidYandex Click ID
  passed: true,true,true,true,true
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false,false
  value: 6906131741665094 passed: false,false,false,false
Tracker content blockingWhen you visit a web page, it frequently has third-party embedded tracking content, such as scripts and tracking pixels. These embedded components spy on you. Some browsers and browser extensions maintain list of tracking companies and block their content from being loaded. This section checks to see if a browser blocks 20 of the largest trackers listed by https://whotracks.me.
AdobeTests whether the browser blocks the page from loading the tracker at https://munchkin.marketo.net/munchkin.js
  url: https://munchkin.marketo.net/munchkin.js passed: true,true,true,true,true
  url: https://munchkin.marketo.net/munchkin.js passed: true,true,true,true,true
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: true,true,true,true,true
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: true,true,true,true,true
  url: https://munchkin.marketo.net/munchkin.js passed: true,true,true,true,true
  url: https://munchkin.marketo.net/munchkin.js passed: true,true,true,true,true
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false
Adobe Audience ManagerTests whether the browser blocks the page from loading the tracker at https://dpm.demdex.net/ibs
  url: https://dpm.demdex.net/ibs passed: true,true,true,true,true
  url: https://dpm.demdex.net/ibs passed: true,true,true,true,true
  url: https://dpm.demdex.net/ibs passed: false,false,false,false,false
  url: https://dpm.demdex.net/ibs passed: true,true,true,true,true
  url: https://dpm.demdex.net/ibs passed: false,false,false,false,false
  url: https://dpm.demdex.net/ibs passed: false,false,false,false,false
  url: https://dpm.demdex.net/ibs passed: true,true,true,true,true
  url: https://dpm.demdex.net/ibs passed: true,true,true,true,true
  url: https://dpm.demdex.net/ibs passed: true,true,true,true,true
  url: https://dpm.demdex.net/ibs passed: false,false,false,false,false
  url: https://dpm.demdex.net/ibs passed: false,false,false,false,false
  url: https://dpm.demdex.net/ibs passed: false,false,false,false,false
  url: https://dpm.demdex.net/ibs passed: false,false,false,false
Amazon adsystemTests whether the browser blocks the page from loading the tracker at https://s.amazon-adsystem.com/dcm
  url: https://s.amazon-adsystem.com/dcm passed: true,true,true,true,true
  url: https://s.amazon-adsystem.com/dcm passed: true,true,true,true,true
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false,false,false
  url: https://s.amazon-adsystem.com/dcm passed: true,true,true,true,true
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false,false,false
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false,false,false
  url: https://s.amazon-adsystem.com/dcm passed: true,true,true,true,true
  url: https://s.amazon-adsystem.com/dcm passed: true,true,true,true,true
  url: https://s.amazon-adsystem.com/dcm passed: true,true,true,true,true
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false,false,false
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false,false,false
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false,false,false
  url: https://s.amazon-adsystem.com/dcm passed: false,false,false,false
AppNexusTests whether the browser blocks the page from loading the tracker at https://ib.adnxs.com/px?id=178248&t=1
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: true,true,true,true,true
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: true,true,true,true,true
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: false,false,false,false,false
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: true,true,true,true,true
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: false,false,false,false,false
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: false,false,false,false,false
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: true,true,true,true,true
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: true,true,true,true,true
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: true,true,true,true,true
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: false,false,false,false,false
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: false,false,false,false,false
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: false,false,false,false,false
  url: https://ib.adnxs.com/px?id=178248&t=1 passed: false,false,false,false
Bing AdsTests whether the browser blocks the page from loading the tracker at https://bat.bing.com/bat.js
  url: https://bat.bing.com/bat.js passed: true,true,true,true,true
  url: https://bat.bing.com/bat.js passed: true,true,true,true,true
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: true,true,true,true,true
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: true,true,true,true,true
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false
ChartbeatTests whether the browser blocks the page from loading the tracker at https://static.chartbeat.com/js/chartbeat.js
  url: https://static.chartbeat.com/js/chartbeat.js passed: true,true,true,true,true
  url: https://static.chartbeat.com/js/chartbeat.js passed: true,true,true,true,true
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: true,true,true,true,true
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: true,true,true,true,true
  url: https://static.chartbeat.com/js/chartbeat.js passed: true,true,true,true,true
  url: https://static.chartbeat.com/js/chartbeat.js passed: true,true,true,true,true
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false
CriteoTests whether the browser blocks the page from loading the tracker at https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: true,true,true,true,true
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: true,true,true,true,true
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: false,false,false,false,false
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: true,true,true,true,true
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: false,false,false,false,false
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: false,false,false,false,false
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: true,true,true,true,true
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: true,true,true,true,true
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: true,true,true,true,true
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: false,false,false,false,false
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: false,false,false,false,false
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: false,false,false,false,false
  url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx passed: false,false,false,false
DoubleClick (Google)Tests whether the browser blocks the page from loading the tracker at https://securepubads.g.doubleclick.net/static/glade.js
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: true,true,true,true,true
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: true,true,true,true,true
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: true,true,true,true,true
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: true,true,true,true,true
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: true,true,true,true,true
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: true,true,true,true,true
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false
Facebook pixelTests whether the browser blocks the page from loading the tracker at https://www.facebook.com/tr?id=123
  url: https://www.facebook.com/tr?id=123 passed: true,true,true,true,true
  url: https://www.facebook.com/tr?id=123 passed: true,true,true,true,true
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: true,true,true,true,true
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: true,true,true,true,true
  url: https://www.facebook.com/tr?id=123 passed: true,true,true,true,true
  url: https://www.facebook.com/tr?id=123 passed: true,true,true,true,true
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false
Google (third-party ad pixel)Tests whether the browser blocks the page from loading the tracker at https://www.google.com/pagead/1p-user-list/
  url: https://www.google.com/pagead/1p-user-list/ passed: true,true,true,true,true
  url: https://www.google.com/pagead/1p-user-list/ passed: true,true,true,true,true
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: true,true,true,true,true
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: true,true,true,true,true
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false
Google AnalyticsTests whether the browser blocks the page from loading the tracker at https://google-analytics.com/urchin.js
  url: https://google-analytics.com/urchin.js passed: true,true,true,true,true
  url: https://google-analytics.com/urchin.js passed: true,true,true,true,true
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: true,true,true,true,true
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: true,true,true,true,true
  url: https://google-analytics.com/urchin.js passed: true,true,true,true,true
  url: https://google-analytics.com/urchin.js passed: true,true,true,true,true
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false
Google Tag ManagerTests whether the browser blocks the page from loading the tracker at https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: true,true,true,true,true
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: true,true,true,true,true
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: true,true,true,true,true
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: true,true,true,true,true
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false
Index ExchangeTests whether the browser blocks the page from loading the tracker at https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: true,true,true,true,true
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: true,true,true,true,true
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: true,true,true,true,true
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: true,true,true,true,true
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: true,true,true,true,true
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: true,true,true,true,true
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false
New RelicTests whether the browser blocks the page from loading the tracker at https://js-agent.newrelic.com/nr-1212.min.js
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: true,true,true,true,true
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: true,true,true,true,true
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: true,true,true,true,true
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: true,true,true,true,true
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: true,true,true,true,true
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: true,true,true,true,true
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false
QuantcastTests whether the browser blocks the page from loading the tracker at https://pixel.quantserve.com/pixel
  url: https://pixel.quantserve.com/pixel passed: true,true,true,true,true
  url: https://pixel.quantserve.com/pixel passed: true,true,true,true,true
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: true,true,true,true,true
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: true,true,true,true,true
  url: https://pixel.quantserve.com/pixel passed: true,true,true,true,true
  url: https://pixel.quantserve.com/pixel passed: true,true,true,true,true
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false
Scorecard Research BeaconTests whether the browser blocks the page from loading the tracker at https://sb.scorecardresearch.com/internal-c2/default/cs.js
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: true,true,true,true,true
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: true,true,true,true,true
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: true,true,true,true,true
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: true,true,true,true,true
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: true,true,true,true,true
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: true,true,true,true,true
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false
TaboolaTests whether the browser blocks the page from loading the tracker at https://trc.taboola.com/futureplc-tomsguide/trc/3/json
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: true,true,true,true,true
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: true,true,true,true,true
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: true,true,true,true,true
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: true,true,true,true,true
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: true,true,true,true,true
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false
Twitter pixelTests whether the browser blocks the page from loading the tracker at https://t.co/i/adsct
  url: https://t.co/i/adsct passed: true,true,true,true,true
  url: https://t.co/i/adsct passed: true,true,true,true,true
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: true,true,true,true,true
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: true,true,true,true,true
  url: https://t.co/i/adsct passed: true,true,true,true,true
  url: https://t.co/i/adsct passed: true,true,true,true,true
  url: https://t.co/i/adsct passed: true,true,true,true,true
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: false,false,false,false
Yandex AdsTests whether the browser blocks the page from loading the tracker at https://yandex.ru/ads/system/header-bidding.js
  url: https://yandex.ru/ads/system/header-bidding.js passed: true,true,true,true,true
  url: https://yandex.ru/ads/system/header-bidding.js passed: true,true,true,true,true
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: true,true,true,true,true
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: true,true,true,true,true
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false