Nightly Builds
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brave
1.39

chrome
102.0

edge
101.0

firefox
101.0a1

opera
87.0

safari
15.4

tor
tbb-nightly.2022

vivaldi
5.3
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: 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: 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 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 73e611ba-4e7d-4c02-b111-d18de5135a02, 43ad2add-b019-4f74-93d1-8d5e978396ea, 3f78f323-455f-4306-bb28-75fb22a25b96, f8dcd18c-ed63-4c97-b575-8ec5da4965aa, d694e738-0dbd-41d0-9a8d-49aa08e54268 result, different first party: 73e611ba-4e7d-4c02-b111-d18de5135a02, 43ad2add-b019-4f74-93d1-8d5e978396ea, 3f78f323-455f-4306-bb28-75fb22a25b96, f8dcd18c-ed63-4c97-b575-8ec5da4965aa, d694e738-0dbd-41d0-9a8d-49aa08e54268 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 result, different first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 result, different first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75, 24f44276-5d22-434e-bbf4-b44e5298db06, 81a48145-53ba-4d73-9c68-adbff1cbd1f1, 9a00fbb4-58a8-40ad-a97e-ad09760269aa result, different first party: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75, 24f44276-5d22-434e-bbf4-b44e5298db06, 81a48145-53ba-4d73-9c68-adbff1cbd1f1, 9a00fbb4-58a8-40ad-a97e-ad09760269aa 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 6720b58b-9811-438a-8c02-553326a3681b, 03476753-a12a-40ff-8c60-664e916115a2, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 6a674dfc-53fc-471c-88fe-8edc7c8253d0, 40dce8ec-fa27-4751-be8c-c51811457f23 result, different first party: 6720b58b-9811-438a-8c02-553326a3681b, 03476753-a12a-40ff-8c60-664e916115a2, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 6a674dfc-53fc-471c-88fe-8edc7c8253d0, 40dce8ec-fa27-4751-be8c-c51811457f23 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: da37219f-3a36-4d4d-83a6-a2e47f4e008d, 3d6bd76c-5d69-476f-ba11-eef41cd32c34, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7 result, different first party: da37219f-3a36-4d4d-83a6-a2e47f4e008d, 3d6bd76c-5d69-476f-ba11-eef41cd32c34, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7 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=${secret}`); let result = await response.json(); let blobUrl = decodeURIComponent(result.blobUrl); let blobResponse = await fetch(blobUrl); return blobResponse.text(); } result, same first party: 3795da0a-9741-498b-be29-f56e717bcdf6, 6b383882-53fe-40cd-9628-3c894f13558b, 18e83d9d-1b5f-4753-83a9-ea3452ca226e, a11115c7-b546-4ea7-b248-92d8f042e458, d1cf6ba2-55e0-4888-bf25-df69939abfb4 result, different first party: Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource., Error: NetworkError when attempting to fetch resource. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let blobURL = URL.createObjectURL(new Blob([secret])); fetch(`${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: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 result, different first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 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: 58a0089f-0465-4ef7-a81e-6379c9b7cbce, 43ad2add-b019-4f74-93d1-8d5e978396ea, 43ad2add-b019-4f74-93d1-8d5e978396ea, 3f78f323-455f-4306-bb28-75fb22a25b96, d694e738-0dbd-41d0-9a8d-49aa08e54268 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: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 result, different first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 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: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 result, different first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 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: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75, 24f44276-5d22-434e-bbf4-b44e5298db06, 81a48145-53ba-4d73-9c68-adbff1cbd1f1, 9a00fbb4-58a8-40ad-a97e-ad09760269aa 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: 6720b58b-9811-438a-8c02-553326a3681b, 03476753-a12a-40ff-8c60-664e916115a2, 03476753-a12a-40ff-8c60-664e916115a2, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 40dce8ec-fa27-4751-be8c-c51811457f23 result, different first party: 6720b58b-9811-438a-8c02-553326a3681b, 03476753-a12a-40ff-8c60-664e916115a2, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 6a674dfc-53fc-471c-88fe-8edc7c8253d0, 40dce8ec-fa27-4751-be8c-c51811457f23 unsupported: false, false, false, false, false passed: false, false, true, true, false test failed: false, false, false, false, false
  write: (secret) => { try { let bc = new BroadcastChannel("secrets"); bc.onmessage = (event) => { if (event.data === "request") { bc.postMessage(secret); } }; } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let bc = new BroadcastChannel("secrets"); bc.onmessage = (event) => { if (event.data !== "request") { resolve(event.data); } }; bc.postMessage("request"); setTimeout(() => reject({message: "no BroadcastChannel message"}), 3000); }) result, same first party: da37219f-3a36-4d4d-83a6-a2e47f4e008d, 3d6bd76c-5d69-476f-ba11-eef41cd32c34, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7 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: 3795da0a-9741-498b-be29-f56e717bcdf6, 6b383882-53fe-40cd-9628-3c894f13558b, 18e83d9d-1b5f-4753-83a9-ea3452ca226e, a11115c7-b546-4ea7-b248-92d8f042e458, d1cf6ba2-55e0-4888-bf25-df69939abfb4 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: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 result, different first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 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=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 7156300943180247, 7156300943180247, 7156300943180247, 7156300943180247, 7156300943180247 result, different first party: Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent., Error: An attempt was made to break through the security policy of the user agent. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398 result, different first party: 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398, 7de09186-f14a-4fe6-9001-1852776ec398 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9 result, different first party: bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9, bb0f63db-19a9-4355-9986-c80f551b9cb9 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75, 24f44276-5d22-434e-bbf4-b44e5298db06, 81a48145-53ba-4d73-9c68-adbff1cbd1f1, 9a00fbb4-58a8-40ad-a97e-ad09760269aa result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 5525088998911329, 5525088998911329, 5525088998911329, 5525088998911329, 5525088998911329 result, different first party: 5525088998911329, 5525088998911329, 5525088998911329, 5525088998911329, 5525088998911329 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: da37219f-3a36-4d4d-83a6-a2e47f4e008d, 3d6bd76c-5d69-476f-ba11-eef41cd32c34, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7 result, different first party: Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url'), Error: undefined is not an object (evaluating 'cacheKeys[0].url') unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { try { let cache = await caches.open("supercookies"); cache.addAll([`test.css?key=${key}`]); } catch (e) { throw new Error("Unsupported"); } } read: async () => { let cache = await caches.open("supercookies"); let cacheKeys = await cache.keys(); let url = cacheKeys[0].url; return (new URL(url)).searchParams.get("key"); } result, same first party: 48672960489762285, 48672960489762285, 48672960489762285, 48672960489762285 result, different first party: 48672960489762285, 48672960489762285, 48672960489762285, 48672960489762285 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(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: 58a0089f-0465-4ef7-a81e-6379c9b7cbce_http, 73e611ba-4e7d-4c02-b111-d18de5135a02_http, 43ad2add-b019-4f74-93d1-8d5e978396ea_http, 3f78f323-455f-4306-bb28-75fb22a25b96_http, f8dcd18c-ed63-4c97-b575-8ec5da4965aa_http result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${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: 0c93c076-b765-4df4-a01b-9a68e0ffcfae_http, 2aa902a7-cc07-4d2f-998b-573ca598b80d_http, cef41025-1cf3-47c4-b58f-8a91d886aa5b_http, 7c91a4e4-4c84-4641-879d-1131256863dc_http, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19_http result, different first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae_http, 2aa902a7-cc07-4d2f-998b-573ca598b80d_http, cef41025-1cf3-47c4-b58f-8a91d886aa5b_http, 7c91a4e4-4c84-4641-879d-1131256863dc_http, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19_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(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: 52dc59f5-8828-4032-bbfa-40a8f646813b_http, c9cc1a9c-9daa-400a-af20-37807dcf5f8f_http, 6cb9c436-5002-46c2-b9b5-4909333772a1_http, 643356b2-17ca-494c-92c8-f66403100d53_http, 28970ee3-b65d-4efd-877e-8f424c5f5688_http result, different first party: 52dc59f5-8828-4032-bbfa-40a8f646813b_http, c9cc1a9c-9daa-400a-af20-37807dcf5f8f_http, 6cb9c436-5002-46c2-b9b5-4909333772a1_http, 643356b2-17ca-494c-92c8-f66403100d53_http, 28970ee3-b65d-4efd-877e-8f424c5f5688_http unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${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: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240_http, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75_http, 24f44276-5d22-434e-bbf4-b44e5298db06_http, 81a48145-53ba-4d73-9c68-adbff1cbd1f1_http, 9a00fbb4-58a8-40ad-a97e-ad09760269aa_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(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: 6720b58b-9811-438a-8c02-553326a3681b_http, 6720b58b-9811-438a-8c02-553326a3681b_http, 6720b58b-9811-438a-8c02-553326a3681b_http, 1f0333cd-1620-4596-ba57-80fb9251d6b5_http, 6a674dfc-53fc-471c-88fe-8edc7c8253d0_http result, different first party: 6720b58b-9811-438a-8c02-553326a3681b_http, 6720b58b-9811-438a-8c02-553326a3681b_http, 6720b58b-9811-438a-8c02-553326a3681b_http, 1f0333cd-1620-4596-ba57-80fb9251d6b5_http, 1f0333cd-1620-4596-ba57-80fb9251d6b5_http unsupported: false, false, false, false, false passed: false, false, false, false, true test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${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: da37219f-3a36-4d4d-83a6-a2e47f4e008d_http, 3d6bd76c-5d69-476f-ba11-eef41cd32c34_http, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f_http, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5_http, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7_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(`${baseURI}headers`); let cookie = (await response.json())["cookie"]; return cookie ? cookie.match(/secret=([\w-]+)/)[1]: null; } result, same first party: 3795da0a-9741-498b-be29-f56e717bcdf6_http, 6b383882-53fe-40cd-9628-3c894f13558b_http, 18e83d9d-1b5f-4753-83a9-ea3452ca226e_http, a11115c7-b546-4ea7-b248-92d8f042e458_http, d1cf6ba2-55e0-4888-bf25-df69939abfb4_http result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { // Request a page that will send an HTTPOnly 'set-cookie' response header with secret value. await fetch(`${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: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323_http, 17c98920-e1af-482e-a448-3bb80f87d4aa_http, fa87a517-a151-4fef-83d4-34deb9c09357_http, ee88e09d-68a5-4d57-9c1b-83bb3ae21089_http result, different first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323_http, 17c98920-e1af-482e-a448-3bb80f87d4aa_http, fa87a517-a151-4fef-83d4-34deb9c09357_http, ee88e09d-68a5-4d57-9c1b-83bb3ae21089_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=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 58a0089f-0465-4ef7-a81e-6379c9b7cbce_js, 73e611ba-4e7d-4c02-b111-d18de5135a02_js, 43ad2add-b019-4f74-93d1-8d5e978396ea_js, 3f78f323-455f-4306-bb28-75fb22a25b96_js, f8dcd18c-ed63-4c97-b575-8ec5da4965aa_js result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae_js, 2aa902a7-cc07-4d2f-998b-573ca598b80d_js, cef41025-1cf3-47c4-b58f-8a91d886aa5b_js, 7c91a4e4-4c84-4641-879d-1131256863dc_js, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19_js result, different first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae_js, 2aa902a7-cc07-4d2f-998b-573ca598b80d_js, cef41025-1cf3-47c4-b58f-8a91d886aa5b_js, 7c91a4e4-4c84-4641-879d-1131256863dc_js, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19_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=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 52dc59f5-8828-4032-bbfa-40a8f646813b_js, c9cc1a9c-9daa-400a-af20-37807dcf5f8f_js, 6cb9c436-5002-46c2-b9b5-4909333772a1_js, 643356b2-17ca-494c-92c8-f66403100d53_js, 28970ee3-b65d-4efd-877e-8f424c5f5688_js result, different first party: 52dc59f5-8828-4032-bbfa-40a8f646813b_js, c9cc1a9c-9daa-400a-af20-37807dcf5f8f_js, 6cb9c436-5002-46c2-b9b5-4909333772a1_js, 643356b2-17ca-494c-92c8-f66403100d53_js, 28970ee3-b65d-4efd-877e-8f424c5f5688_js unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240_js, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75_js, 24f44276-5d22-434e-bbf4-b44e5298db06_js, 81a48145-53ba-4d73-9c68-adbff1cbd1f1_js, 9a00fbb4-58a8-40ad-a97e-ad09760269aa_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=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 6720b58b-9811-438a-8c02-553326a3681b_js, 6720b58b-9811-438a-8c02-553326a3681b_js, 6720b58b-9811-438a-8c02-553326a3681b_js, 1f0333cd-1620-4596-ba57-80fb9251d6b5_js, 6a674dfc-53fc-471c-88fe-8edc7c8253d0_js result, different first party: 6720b58b-9811-438a-8c02-553326a3681b_js, 6720b58b-9811-438a-8c02-553326a3681b_js, 6720b58b-9811-438a-8c02-553326a3681b_js, 1f0333cd-1620-4596-ba57-80fb9251d6b5_js, 1f0333cd-1620-4596-ba57-80fb9251d6b5_js unsupported: false, false, false, false, false passed: false, false, false, false, true test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: da37219f-3a36-4d4d-83a6-a2e47f4e008d_js, 3d6bd76c-5d69-476f-ba11-eef41cd32c34_js, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f_js, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5_js, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7_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=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 3795da0a-9741-498b-be29-f56e717bcdf6_js, 6b383882-53fe-40cd-9628-3c894f13558b_js, 18e83d9d-1b5f-4753-83a9-ea3452ca226e_js, a11115c7-b546-4ea7-b248-92d8f042e458_js, d1cf6ba2-55e0-4888-bf25-df69939abfb4_js result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { document.cookie = `secret=${secret}_js; SameSite=None; Secure`; } read: () => document.cookie ? document.cookie.match(/secret=([\w-]+)/)[1] : null result, same first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323_js, 17c98920-e1af-482e-a448-3bb80f87d4aa_js, fa87a517-a151-4fef-83d4-34deb9c09357_js, ee88e09d-68a5-4d57-9c1b-83bb3ae21089_js result, different first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323_js, 17c98920-e1af-482e-a448-3bb80f87d4aa_js, fa87a517-a151-4fef-83d4-34deb9c09357_js, ee88e09d-68a5-4d57-9c1b-83bb3ae21089_js 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 += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_7305216856796772, fake_3359627212821248, fake_3564724417235192, fake_4476986904553679, fake_29642439550853883 result, different first party: fake_4972042062165032, fake_6203670164562327, fake_9732374235607957, fake_21593031146954456, fake_45608115587094167 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_7278297568861272, fake_2731543236871474, fake_7333779651683823, fake_10467301523112349, fake_3918524706483626 result, different first party: fake_7278297568861272, fake_2731543236871474, fake_7333779651683823, fake_10467301523112349, fake_3918524706483626 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_5410377923888416, fake_04956661275549057, fake_6501979978096801, fake_5430551924636868, fake_42503741463880895 result, different first party: fake_5410377923888416, fake_04956661275549057, fake_6501979978096801, fake_5430551924636868, fake_42503741463880895 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_6043676042553372, fake_7685810709425287, fake_15422272722755603, fake_8138678456873938, fake_37964153828734704 result, different first party: fake_04865740127410567, fake_8882683719577864, fake_6449873899167398, fake_7303998245606735, fake_806803117159691 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_920293336884705, fake_23248782180374072, fake_30967689558512057, fake_06036082323887748, fake_2173204033958973 result, different first party: fake_31174180311987665, fake_23248782180374072, fake_03454130705568126, fake_5799968931220476, fake_6022442849136802 unsupported: false, false, false, false, false passed: true, false, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_7574009844165128, fake_4506744887384522, fake_28787533337048443, fake_39529541770502097, fake_22814071883167197 result, different first party: fake_17811403867614728, fake_4140323657660445, fake_3794963664450426, fake_31431845779950596, fake_294256941073598 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_3058316567625785, fake_14439235772559122, fake_563088538508862, fake_5618381268338957, fake_37243708750427085 result, different first party: fake_537610892848104, fake_6875426905837776, fake_819348209487571, fake_4213576567315529, fake_9173966489552963 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return key; } read: async (key) => { const href = testURI("resource", "css", key); const head = document.getElementsByTagName("head")[0]; head.innerHTML += ``; const testElement = document.querySelector("#css"); let fontFamily; while (true) { await sleepMs(100); fontFamily = getComputedStyle(testElement).fontFamily; if (fontFamily.startsWith("fake")) { break; } } console.log(fontFamily); return fontFamily; } result, same first party: fake_6889495432502248, fake_5228060113457487, fake_33443666474590983, fake_8962814375938939 result, different first party: fake_6889495432502248, fake_7680431534936443, fake_07742446792237234, fake_5121862244532007 unsupported: false, false, false, false passed: false, 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: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => key read: async (key) => { // Wait for the favicon to load (defined in supercookies.html) await sleepMs(500); let response = await fetch( testURI("ctr", "favicon", key), {"cache": "reload"}); let count = (await response.text()).trim(); if (count === "0") { throw new Error("No requests received"); } return count; } result, same first party: 2, 2, 2, 2 result, different first party: 2, 2, 2, 2 unsupported: false, false, false, false passed: false, false, false, false 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: 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 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, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 1, 2, 2, 2 unsupported: false, false, false, false, false passed: true, false, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); return key; } read: async (key) => { let style = document.createElement("style"); style.type='text/css'; let fontURI = testURI("resource", "font", key); style.innerHTML = `@font-face {font-family: "myFont"; src: url("${fontURI}"); } body { font-family: "myFont" }`; document.getElementsByTagName("head")[0].appendChild(style); await sleepMs(500); let response = await fetch( testURI("ctr", "font", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 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 result, different first party: 1, 1, 1, 1 unsupported: false, false, false, false passed: false, false, false, false 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 58a0089f-0465-4ef7-a81e-6379c9b7cbce, 73e611ba-4e7d-4c02-b111-d18de5135a02, 43ad2add-b019-4f74-93d1-8d5e978396ea, 3f78f323-455f-4306-bb28-75fb22a25b96, f8dcd18c-ed63-4c97-b575-8ec5da4965aa result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 result, different first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 result, different first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75, 24f44276-5d22-434e-bbf4-b44e5298db06, 81a48145-53ba-4d73-9c68-adbff1cbd1f1, 9a00fbb4-58a8-40ad-a97e-ad09760269aa 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 1f0333cd-1620-4596-ba57-80fb9251d6b5 result, different first party: 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 1f0333cd-1620-4596-ba57-80fb9251d6b5 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: da37219f-3a36-4d4d-83a6-a2e47f4e008d, 3d6bd76c-5d69-476f-ba11-eef41cd32c34, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h1.arthuredelstein.net:8901/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 3795da0a-9741-498b-be29-f56e717bcdf6, 6b383882-53fe-40cd-9628-3c894f13558b, 18e83d9d-1b5f-4753-83a9-ea3452ca226e, a11115c7-b546-4ea7-b248-92d8f042e458, d1cf6ba2-55e0-4888-bf25-df69939abfb4 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h1.arthuredelstein.net:8901/?mode=write&secret=${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: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 result, different first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 58a0089f-0465-4ef7-a81e-6379c9b7cbce, 73e611ba-4e7d-4c02-b111-d18de5135a02, 43ad2add-b019-4f74-93d1-8d5e978396ea, 3f78f323-455f-4306-bb28-75fb22a25b96, f8dcd18c-ed63-4c97-b575-8ec5da4965aa result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 result, different first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 result, different first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75, 24f44276-5d22-434e-bbf4-b44e5298db06, 81a48145-53ba-4d73-9c68-adbff1cbd1f1, 9a00fbb4-58a8-40ad-a97e-ad09760269aa 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6a674dfc-53fc-471c-88fe-8edc7c8253d0, 1f0333cd-1620-4596-ba57-80fb9251d6b5 result, different first party: 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6a674dfc-53fc-471c-88fe-8edc7c8253d0, 1f0333cd-1620-4596-ba57-80fb9251d6b5 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: da37219f-3a36-4d4d-83a6-a2e47f4e008d, 3d6bd76c-5d69-476f-ba11-eef41cd32c34, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7 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=${secret}`, {cache: "no-store"}); } read: async () => { let response = await fetch(`https://h2.arthuredelstein.net:8902/?mode=read`, {cache: "no-store"}); return await response.text(); } result, same first party: 3795da0a-9741-498b-be29-f56e717bcdf6, 6b383882-53fe-40cd-9628-3c894f13558b, 18e83d9d-1b5f-4753-83a9-ea3452ca226e, a11115c7-b546-4ea7-b248-92d8f042e458, d1cf6ba2-55e0-4888-bf25-df69939abfb4 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (secret) => { await fetch(`https://h2.arthuredelstein.net:8902/?mode=write&secret=${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: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 result, different first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 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: 7c7cceaee4a8b5685054ce5d5c176220, 0de8f2536ddfcf27a7a60ae21225f32b, 6a29f17a2c3e2bc2eff05e02a2eb6173, 9f0218c060fea49ca29dad75abbac2c7, 60565762d4552a62ed004e7d61d71d32 result, different first party: 42d413808a3650f33ec07779da79dca1, f303bf7f7f1c914a543c4148f6aada3e, 6fbcf30159f255bc5f2770c16a772b1a, c7879462437cc1148e4c55b84d0edb34, f3ed34dfd29412a5b88868cc5a89d96b 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: 52afdbd8d8a45ef662f26bca1d711ea3, 6b3d72a5b1969bfd85ec1846606a09cf, 8686d1aa66c3d016e7079286c4321e0d, c7efabb4b1dc2a33e328e67cd3acbcb9, 483c5350ac12f87ed5e989fd4062c718 result, different first party: 52afdbd8d8a45ef662f26bca1d711ea3, 6b3d72a5b1969bfd85ec1846606a09cf, 8686d1aa66c3d016e7079286c4321e0d, c7efabb4b1dc2a33e328e67cd3acbcb9, 483c5350ac12f87ed5e989fd4062c718 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: 0ac482085d0b274ed0b74fc41c415962, ac91bebf5265cfc22e062c1ba7093539, 4be5fc981f61e9d6f7d0d87c012a2f14, bb639938c1a3bda8fbcf34a67648519f, 0c300bb78f3b384f1e336c6339a1adda result, different first party: 0ac482085d0b274ed0b74fc41c415962, ac91bebf5265cfc22e062c1ba7093539, 4be5fc981f61e9d6f7d0d87c012a2f14, bb639938c1a3bda8fbcf34a67648519f, 0c300bb78f3b384f1e336c6339a1adda 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: 1c7905a7cb7ee1dfd9914a3be7e25dae, 52708cd30f76f3a1079f4b1f06dde56a, 497ac03a4d2edfcebe08a752f708c222, 57f9a7c1936660ecc2992a52b0bb729a, eef5cea566f5fb375bae61fe72515287 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: 88033ca0b595d06b7595ef3900282af9, 324375ae8fb4bb9d4871189c375405a9, a81face05489d93b400ee67ae06cfdb8, 2b84ed7317738a3f59e0d6872f4640b7, f6836f4db7b9d1fb1523fbc82745ad52 result, different first party: 88033ca0b595d06b7595ef3900282af9, 324375ae8fb4bb9d4871189c375405a9, a81face05489d93b400ee67ae06cfdb8, 2b84ed7317738a3f59e0d6872f4640b7, f6836f4db7b9d1fb1523fbc82745ad52 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: fcec3204c41942da2f1cfcb8ff9489fe, 33286ff884421c8f24e8902745d3e2fa, 6d445c6cc66f331644e6f16192ce629a, 3580e32395b50405b83f27f8157717c9 result, different first party: fcec3204c41942da2f1cfcb8ff9489fe, 33286ff884421c8f24e8902745d3e2fa, 6d445c6cc66f331644e6f16192ce629a, 3580e32395b50405b83f27f8157717c9 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: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Used http, Used http, Used http, Used http, Used http unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https, Upgraded to https unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: set HSTS flag read: read HSTS flag result, same first party: not tested, not tested, not tested, not tested, not tested result, different first party: Used http, Used http, Used http, Used http, Used http unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: 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 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: 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 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: 1, 1, 1, 1, 1 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 1, 2, 2, 2 unsupported: false, false, false, false, false passed: true, false, true, true, true test failed: false, false, false, false, false
  write: (key) => new Promise((resolve, reject) => { let img = document.createElement("img"); document.body.appendChild(img); img.addEventListener("load", () => resolve(key), {once: true}); img.src = testURI("resource", "image", key); }) read: async (key) => { let img = document.createElement("img"); document.body.appendChild(img); let imgLoadPromise = new Promise((resolve, reject) => { img.addEventListener("load", resolve, {once: true}); }); img.src = testURI("resource", "image", key); await imgLoadPromise; let response = await fetch( testURI("ctr", "image", key), {"cache": "reload"}); return (await response.text()).trim(); } result, same first party: 1, 1, 1, 1, 1 result, different first party: 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 result, different first party: 1, 1, 1, 1 unsupported: false, false, false, false passed: false, false, false, false 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: 58a0089f-0465-4ef7-a81e-6379c9b7cbce, 73e611ba-4e7d-4c02-b111-d18de5135a02, 43ad2add-b019-4f74-93d1-8d5e978396ea, 3f78f323-455f-4306-bb28-75fb22a25b96, f8dcd18c-ed63-4c97-b575-8ec5da4965aa 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: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 result, different first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 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: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 result, different first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 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: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75, 24f44276-5d22-434e-bbf4-b44e5298db06, 81a48145-53ba-4d73-9c68-adbff1cbd1f1, 9a00fbb4-58a8-40ad-a97e-ad09760269aa 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: 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 6a674dfc-53fc-471c-88fe-8edc7c8253d0 result, different first party: 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 1f0333cd-1620-4596-ba57-80fb9251d6b5 unsupported: false, false, false, false, false passed: false, false, false, false, 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: da37219f-3a36-4d4d-83a6-a2e47f4e008d, 3d6bd76c-5d69-476f-ba11-eef41cd32c34, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7 result, different first party: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations., Error: A mutation operation was attempted on a database that did not allow mutations. result, different first party: Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure., Error: The operation is insecure. unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (secret) => { try { return await IdbKeyVal.set("secret", secret); } catch (e) { throw new Error("Unsupported"); } } read: () => IdbKeyVal.get("secret") result, same first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 result, different first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 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: 58a0089f-0465-4ef7-a81e-6379c9b7cbce, 73e611ba-4e7d-4c02-b111-d18de5135a02, 43ad2add-b019-4f74-93d1-8d5e978396ea, 3f78f323-455f-4306-bb28-75fb22a25b96, f8dcd18c-ed63-4c97-b575-8ec5da4965aa 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: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 result, different first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 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: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 result, different first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 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: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75, 24f44276-5d22-434e-bbf4-b44e5298db06, 81a48145-53ba-4d73-9c68-adbff1cbd1f1, 9a00fbb4-58a8-40ad-a97e-ad09760269aa 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: 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 6a674dfc-53fc-471c-88fe-8edc7c8253d0 result, different first party: 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 1f0333cd-1620-4596-ba57-80fb9251d6b5 unsupported: false, false, false, false, false passed: false, false, false, false, true test failed: false, false, false, false, false
  write: (secret) => localStorage.setItem("secret", secret) read: () => localStorage.getItem("secret") result, same first party: da37219f-3a36-4d4d-83a6-a2e47f4e008d, 3d6bd76c-5d69-476f-ba11-eef41cd32c34, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7 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: 3795da0a-9741-498b-be29-f56e717bcdf6, 6b383882-53fe-40cd-9628-3c894f13558b, 18e83d9d-1b5f-4753-83a9-ea3452ca226e, a11115c7-b546-4ea7-b248-92d8f042e458, d1cf6ba2-55e0-4888-bf25-df69939abfb4 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: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 result, different first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 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: 58a0089f-0465-4ef7-a81e-6379c9b7cbce, 73e611ba-4e7d-4c02-b111-d18de5135a02, 43ad2add-b019-4f74-93d1-8d5e978396ea, 3f78f323-455f-4306-bb28-75fb22a25b96, f8dcd18c-ed63-4c97-b575-8ec5da4965aa 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: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 result, different first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 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: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 result, different first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 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: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75, 24f44276-5d22-434e-bbf4-b44e5298db06, 81a48145-53ba-4d73-9c68-adbff1cbd1f1, 9a00fbb4-58a8-40ad-a97e-ad09760269aa 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: 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 1f0333cd-1620-4596-ba57-80fb9251d6b5 result, different first party: 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 1f0333cd-1620-4596-ba57-80fb9251d6b5 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: da37219f-3a36-4d4d-83a6-a2e47f4e008d, 3d6bd76c-5d69-476f-ba11-eef41cd32c34, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7 result, different first party: Error: undefined is not an object (evaluating 'queryResult.held[0].name'), Error: undefined is not an object (evaluating 'queryResult.held[0].name'), Error: undefined is not an object (evaluating 'queryResult.held[0].name'), Error: undefined is not an object (evaluating 'queryResult.held[0].name'), Error: undefined is not an object (evaluating 'queryResult.held[0].name') unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { if (navigator.locks) { navigator.locks.request(key, lock => new Promise((f,r) => {})); let queryResult = await navigator.locks.query(); return queryResult.held[0].clientId; } else { throw new Error("Unsupported"); } } read: async () => { if (navigator.locks) { let queryResult = await navigator.locks.query(); return queryResult.held[0].name; } } result, same first party: undefined result, different first party: undefined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { if (navigator.locks) { navigator.locks.request(key, lock => new Promise((f,r) => {})); let queryResult = await navigator.locks.query(); return queryResult.held[0].clientId; } else { throw new Error("Unsupported"); } } read: async () => { if (navigator.locks) { let queryResult = await navigator.locks.query(); return queryResult.held[0].name; } } result, same first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 result, different first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 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: 1, 2, 1, 1, 1 unsupported: false, false, false, false, false passed: false, true, 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, 1, 2, 2, 2 unsupported: false, false, false, false, false passed: true, false, true, true, true test failed: false, false, false, false, false
write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received result, different first party: Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received, Error: No requests received unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1, 1 result, different first party: 2, 2, 2, 2, 2 unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); return key; } read: async (key) => { let link = document.createElement("link"); link.rel = "prefetch"; link.href = testURI("resource", "prefetch", key); document.getElementsByTagName("head")[0].appendChild(link); await sleepMs(500); let response = await fetch( testURI("ctr", "prefetch", key), {"cache": "reload"}); let countString = (await response.text()).trim(); if (parseInt(countString) === 0) { throw new Error("No requests received"); } return countString; } result, same first party: 1, 1, 1, 1 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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: , , , , result, different first party: Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker., Error: Failed to register a ServiceWorker for scope ('https://arthuredelstein.net/test-pages/') with script ('https://arthuredelstein.net/test-pages/serviceWorker.js'): The user denied permission to use Service Worker. unsupported: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: , , , , result, different first party: , , , , unsupported: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: , , , , result, different first party: , , , , unsupported: false, false, false, false, false passed: undefined test failed: true, true, true, true, true
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75, 24f44276-5d22-434e-bbf4-b44e5298db06, 81a48145-53ba-4d73-9c68-adbff1cbd1f1, 9a00fbb4-58a8-40ad-a97e-ad09760269aa 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=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: , 03476753-a12a-40ff-8c60-664e916115a2, , , result, different first party: , 03476753-a12a-40ff-8c60-664e916115a2, , , unsupported: false, false, false, false, false passed: , false test failed: true, false, true, true, true
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${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: da37219f-3a36-4d4d-83a6-a2e47f4e008d, 3d6bd76c-5d69-476f-ba11-eef41cd32c34, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined result, different first party: Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined, Error: navigator.serviceWorker is undefined unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { if (!navigator.serviceWorker) { throw new Error("Unsupported"); } let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); await fetch(`serviceworker-write?secret=${key}`); } read: async () => { let registration = await navigator.serviceWorker.register( 'serviceWorker.js'); console.log(registration); await navigator.serviceWorker.ready; console.log("service worker ready"); await sleepMs(100); let response = await fetch("serviceworker-read"); return await response.text(); } result, same first party: , , , result, different first party: , , , unsupported: false, false, false, false passed: undefined test failed: true, true, true, true
SharedWorkerThe SharedWorker API allows scripts from multiple tabs to share a background thread of computation. If SharedWorker is not partitioned, then it can be abused to shared data between websites in your browser.
  write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: 58a0089f-0465-4ef7-a81e-6379c9b7cbce, 73e611ba-4e7d-4c02-b111-d18de5135a02, 43ad2add-b019-4f74-93d1-8d5e978396ea, 3f78f323-455f-4306-bb28-75fb22a25b96, f8dcd18c-ed63-4c97-b575-8ec5da4965aa result, different first party: Error: undefined, Error: undefined, Error: undefined, Error: undefined, Error: undefined unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 result, different first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 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: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 result, different first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 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: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75, 24f44276-5d22-434e-bbf4-b44e5298db06, 81a48145-53ba-4d73-9c68-adbff1cbd1f1, 9a00fbb4-58a8-40ad-a97e-ad09760269aa 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: 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 6a674dfc-53fc-471c-88fe-8edc7c8253d0 result, different first party: 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 1f0333cd-1620-4596-ba57-80fb9251d6b5 unsupported: false, false, false, false, false passed: false, false, false, false, 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: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker result, different first party: Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker, Error: Can't find variable: SharedWorker unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: (secret) => { try { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage(secret); } catch (e) { throw new Error("Unsupported"); } } read: () => new Promise((resolve, reject) => { let worker = new SharedWorker("supercookies_sharedworker.js"); worker.port.start(); worker.port.postMessage("request"); worker.port.onmessage = (e) => resolve(e.data); setTimeout(() => reject("no SharedWorker message received"), 100); }) result, same first party: 3795da0a-9741-498b-be29-f56e717bcdf6, 6b383882-53fe-40cd-9628-3c894f13558b, 18e83d9d-1b5f-4753-83a9-ea3452ca226e, a11115c7-b546-4ea7-b248-92d8f042e458, d1cf6ba2-55e0-4888-bf25-df69939abfb4 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: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 result, different first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 unsupported: false, false, false, false passed: false, false, false, false 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: b09877fae755377b64d00d1a613dc3a9b7a5c6e411d0219b84fd58ffdf295423, 43cc58c7601af4826a7664c58191068d009a7e1e01ef25ff5279d090fcb64abb, db0d8bb64369edf992a89d503dee327aa86a66c26aecaeaa22beb2994fb2c2b1, c4206eb5bd7e09cce5587c8698474c2a874da0c8609aef1cf717d1259a48ab68, 78eadc01cbf763f0fe4562eca37d89f1dacb03163d6cf8ff49267dce1850a03e result, different first party: 91c5ab8794eb56cdbd79c20a7bfe326865a3c92b0e833ff00035216159057746, 241d093c4a5848b76e3ec524c5c27de6fd1b21cad0a99dcac02cc44e86958f65, 0c96fcdd73c671ec0d74733bdbc71d34b6e11d1b7986156a9ca65aae78c7d792, 442cb643fdff3cd5e10398bc1398fd59b6d076fc7a8e64e28b215b3c5c4a357a, 8c63778266da87ecb0cbd762043f468b1d97783f333ff2ae9c0ae7969db7bf31 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: 9c2594b7aaf4e9c0921fbbe1f856a044f3d68269bf308533328f73808adb170c, 460a8b17bfa6cf43d90785109b2a6fe8f9a0ea0305a06c62d9402398349a55d7, 28d7be291460ea463020d55438f6160d62066b8ba0da7d6415e2ca84dc81da42, 6e978f2329c4ce4d11505348dcd7b5046ef6e2f7974f5a499c736023c2a5c880, 6f9c0e4f2591caefc8141ad220faddf6296b28ef01af1a536923c86964d75164 result, different first party: 2f622e81475889f8353c598c0b1ccd08e3ab323a9912c78862a3c03043f48c07, 48d71b6017c8cd6e04a201443765b1baf0f48cd4253113b54a88734de3da36bd, b0d65dfb8e87f45902b2fcfe567cc61b777e7a42774b67289643f1f5a2dc8dc3, 89fb872cdc78b7adb16afaf5de65165c59311e1617b2f6c7d03c23cc2cf7403a, d47b643ba25e2803e6f4fc4c97f5448024b36202a6e44b475b849d81fc3680f1 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: 8339f73cdc5d78f2b66f4aa0c08752dbb937bf6a24c7e2d3be740c726c7f731b, 43bb125d4a0369e3c2ac498c4f630398d2a92ad98db8440b29d509000c479a6a, eb7d310272abe84ea64a62e1959550256ebb54231609e200e0c4a7118244bdfc, ff0f6cd6a566aa0bdabef1bdccbe698e500185a0fe50b5541e9f6b458e99356e, 1d24e2a93efc9ce4902419634d399a38dc6b53e36181717b0621021884c342c0 result, different first party: 21676faeefc0b22db7dc08442e84bdd3aca11a771d5e691fb7eb57387b2af3cf, f3f8297c956e54835d4f7a59f4d8e6a1c7842568f54bdec2f13bfd58a4ae8121, 7aaee4a8f8444a46043322640ce11a2e4609a7b059d103005207af790348182c, 69d0c7629b4a6f1032a34ce8cfcfc5cb3cc96b74395ee53507b7056529616688, bf0266e0252652338866519b7bc61a0870e2f001691e055bb9c18d535067c9c6 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: 283a8ae8d4e761cb879299836b174ff2d94080f8efff9d05e3cbfb275fc70dc4, 023077d669e671e4cb024d09616f30bddfce12148e4b24055145b632f365afa4, 871c32c9c87989adaec5010364abf694c296e0360b63782dfa16e64d6feb4fb5, c3d86ec1f29da0952c387de287106753ae522ae56108fcbe70001b5fc9c96528, 00290e33b2c1d88f520e591d91411680a7b7ee81f3bc734be79e84deb92c74e9 result, different first party: b4acec8766ffc591360cffb31b3bc2a508d1475cb9f3680d3962828a30cc8b73, ff354d908c3c8529af6e3e95c2b24968f196848abbac73a653608af79f7e251e, f0fc10b6ab4e96ca481c7a7c0e6f29690928d90b2d1ba2b8d8db0b45ae2f42ff, 788f5c03c01e30bb9eb3a6eb3cfb8ebd7cc7df13433467033bb7184c8d5cb557, 1fea7f0aaee2b5ea2ae92c635a2c40402c6b647bd54b11571b63b5837a08aaec 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: d03c513fd0c4e6b70374a359f000c08f59508649a3b45ce0d63cc7b11d88630d, 12249d0a1cd4db98e3396d9abe6246bca1c1cf5da46ba2cebc3de32e31026e57, 15451d36eda9c45e8436daf55743e06029c6954ec79904f86e2e0de9ccaa8130, bd65723fbc8917d689edfbe1ffa401fd58445cf6632a0f8dc6ec24715ebe2937, 7cdbd7628d1e9c03b51d6f0e5b4b9ab09767f8fd2b2ac47d93100198d48b80f7 result, different first party: 47e14754eb45bc5654dec8e43de3ae23a816f8509b7bd2a09d86da87a37549d1, b17a144b8c1e73aace38cdc2c76be76f2604093efe44582761532199747fd5e2, 15451d36eda9c45e8436daf55743e06029c6954ec79904f86e2e0de9ccaa8130, 4ab9a19b73d9ef5205daf908b1ecb04a24a2fda294acd91cdb9142acda55f4ce, 7cdbd7628d1e9c03b51d6f0e5b4b9ab09767f8fd2b2ac47d93100198d48b80f7 unsupported: false, false, false, false, false passed: true, true, false, true, false 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: 95538e4ff348c826ec61d38c7294f9fa456b2069936a29f2c4ba9eb8596c75c4, 53449f09a7461e92956b10c206b52214247f08222f66dd1387b715157ebb3b9c, c2448127cb2cadf7bad6b3c8b59bd0eab400935e5c378801c65633d826dcd7af, 40774e89ee29d91557788fcf35d1a75d77b633549b391a2449c8c25a81d71046, 7055c04ec15a7b1999f0086cc799cd0ec00bd482b666bf612aeef96bdf3154e4 result, different first party: 749b7a17e006253edd0fcf052305b4a1d30dcfb4634b335d0d05e25612b21711, fa47a527525aedd0b26e22160e28e00632bf5a393b5085f1af7977324bcaeaf9, d29262005da800a001503ea87d00ddca2757e45104d6a4dc58b584e1f2244b4c, ee792dc98ea94bd7e56c530259c6ca49b05eb81694df6047e34122ec5fd07171, 5d1ddab7159b30d78721b7af4c89af7f3acbf9a9ae7d0389be79bfc120e03f67 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: 078e83af25bd1727a46e65d66973a59f82592b2ed297e900dbae2bdde72734ef, affbe87707e0d667a255f88954d037134cc1d37ed21d555316930581d5c39de1, 79ee56347b0d6e630e2d64fc046a816f7cb7946761fbd7bbdeaea42e59273fa7, 4cf8ac8152219d19ec6ff6f63da11f440f123716b4ea4690d57a82af2b818c97, 073c768e314a1f244bac9113cfaf37c168283b426eabda6dcb2e9f799131be63 result, different first party: a725f3108a5fe03f4a720fb3b2491283510d3a1df1ae3ebf4a1181263324520e, 0ff8469f56daf224ab3bb27f668a6fac9cd0046a65ffa2462a68fbd52f633ddf, 691b3e4b12f178d82430f23cbfc73097fc6058572662205c4881d8dd08a66a58, 5a3aac42dc9374f1aa3cdbb202ed9c5f31e86652c9dc20b314b7a0890e4f7154, 338f93b28dd6309a810f6744e2d54ce764f03d9fb07a444ae0809780491d9d3d 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: d5bf78c2edb37b9f07b7c621ad544753fb6ab7728bf470fcb6c7e7c41e207bae, 96c09dce7057cc7e124d4a381074e14e60a9fcc0a424b89e3f8ec01bfc83ac91, 00932611a6a6cbdf3fd90093107772d418a1122fa51e9f17d8ede49ca687404d, 8e9e401236b45303b6e826fd5c7d762431ec5a26f5fbaaa27a3f620b66ddb383 result, different first party: e9050e0cc037c5a70b51eabc29cd4123e2525b25e0a0084fb522b0aeb2df6866, cd39fb0d5761594daff37a8f0c981cafdc6dab6f568d49a696cff91491c1dde2, 70650ec6e35ca825b2bb135bd84639555ee1e901e000e55a356d7992ae9f8bc2, d5f1f23d502777a715060580cabc085f6549ee0a79e5d1de1dc6c45402ece750 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("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: 58a0089f-0465-4ef7-a81e-6379c9b7cbce, 73e611ba-4e7d-4c02-b111-d18de5135a02, 43ad2add-b019-4f74-93d1-8d5e978396ea, 3f78f323-455f-4306-bb28-75fb22a25b96, f8dcd18c-ed63-4c97-b575-8ec5da4965aa result, different first party: Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 result, different first party: Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 result, different first party: Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function result, different first party: Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6720b58b-9811-438a-8c02-553326a3681b, 6a674dfc-53fc-471c-88fe-8edc7c8253d0, 1f0333cd-1620-4596-ba57-80fb9251d6b5 result, different first party: Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts., Error: Failed to execute 'openDatabase' on 'Window': Access to the WebDatabase API is denied in third party contexts. unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated result, different first party: Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated, Error: Web SQL is deprecated unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function result, different first party: Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function, Error: window.openDatabase is not a function unsupported: true, true, true, true, true passed: undefined test failed: false, false, false, false, false
  write: async (key) => { if (!window.openDatabase) { throw new Error("Unsupported"); } let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let tx = new Promise((resolve) => database.transaction(tx => { tx.executeSql( `CREATE TABLE IF NOT EXISTS cache( id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, value TEXT NOT NULL, UNIQUE (name) )`, [], (tx, rs) => {}, (tx, err) => {}); tx.executeSql( `INSERT OR REPLACE INTO cache(name, value) VALUES(?, ?)`, ["secret", key], (tx, rs) => {}, (tx, rs) => {}); })); } read: async () => { let database = window.openDatabase("sqlite_supercookie", "", "supercookie", 1024 * 1024); let result = await new Promise((resolve, reject) => database.transaction(tx => { tx.executeSql( "SELECT value FROM cache WHERE name=?", ["secret"], (tx, rs) => resolve(rs), (tx, err) => reject(err)); })); return result.rows.item(0).value; } result, same first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 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: 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 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: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ result, different first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => { /* do nothing */ } read: () => new Promise((resolve) => { parent.postMessage({"read document.referrer": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/, https://arthuredelstein.net/ 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: 73e611ba-4e7d-4c02-b111-d18de5135a02, 43ad2add-b019-4f74-93d1-8d5e978396ea, 3f78f323-455f-4306-bb28-75fb22a25b96, f8dcd18c-ed63-4c97-b575-8ec5da4965aa, d694e738-0dbd-41d0-9a8d-49aa08e54268 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: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 result, different first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 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: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 result, different first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 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: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75, 24f44276-5d22-434e-bbf4-b44e5298db06, 81a48145-53ba-4d73-9c68-adbff1cbd1f1, 9a00fbb4-58a8-40ad-a97e-ad09760269aa 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: 6720b58b-9811-438a-8c02-553326a3681b, 03476753-a12a-40ff-8c60-664e916115a2, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 6a674dfc-53fc-471c-88fe-8edc7c8253d0, 40dce8ec-fa27-4751-be8c-c51811457f23 result, different first party: 6720b58b-9811-438a-8c02-553326a3681b, 03476753-a12a-40ff-8c60-664e916115a2, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 6a674dfc-53fc-471c-88fe-8edc7c8253d0, 40dce8ec-fa27-4751-be8c-c51811457f23 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: da37219f-3a36-4d4d-83a6-a2e47f4e008d, 3d6bd76c-5d69-476f-ba11-eef41cd32c34, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7 result, different first party: da37219f-3a36-4d4d-83a6-a2e47f4e008d, 3d6bd76c-5d69-476f-ba11-eef41cd32c34, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7 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: 3795da0a-9741-498b-be29-f56e717bcdf6, 6b383882-53fe-40cd-9628-3c894f13558b, 18e83d9d-1b5f-4753-83a9-ea3452ca226e, a11115c7-b546-4ea7-b248-92d8f042e458, d1cf6ba2-55e0-4888-bf25-df69939abfb4 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: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 result, different first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 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) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 73e611ba-4e7d-4c02-b111-d18de5135a02, 43ad2add-b019-4f74-93d1-8d5e978396ea, 3f78f323-455f-4306-bb28-75fb22a25b96, f8dcd18c-ed63-4c97-b575-8ec5da4965aa, d694e738-0dbd-41d0-9a8d-49aa08e54268 result, different first party: 73e611ba-4e7d-4c02-b111-d18de5135a02, 43ad2add-b019-4f74-93d1-8d5e978396ea, 3f78f323-455f-4306-bb28-75fb22a25b96, f8dcd18c-ed63-4c97-b575-8ec5da4965aa, d694e738-0dbd-41d0-9a8d-49aa08e54268 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 result, different first party: 0c93c076-b765-4df4-a01b-9a68e0ffcfae, 2aa902a7-cc07-4d2f-998b-573ca598b80d, cef41025-1cf3-47c4-b58f-8a91d886aa5b, 7c91a4e4-4c84-4641-879d-1131256863dc, ca9b4819-b7b5-49ca-abe6-c2e9b23cfd19 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 result, different first party: 52dc59f5-8828-4032-bbfa-40a8f646813b, c9cc1a9c-9daa-400a-af20-37807dcf5f8f, 6cb9c436-5002-46c2-b9b5-4909333772a1, 643356b2-17ca-494c-92c8-f66403100d53, 28970ee3-b65d-4efd-877e-8f424c5f5688 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: e7f3bfa5-9c64-4125-9fd2-89c7bacc2240, 4bf862a0-b8e3-4ae7-ae36-8722cacd5b75, 24f44276-5d22-434e-bbf4-b44e5298db06, 81a48145-53ba-4d73-9c68-adbff1cbd1f1, 9a00fbb4-58a8-40ad-a97e-ad09760269aa result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 6720b58b-9811-438a-8c02-553326a3681b, 03476753-a12a-40ff-8c60-664e916115a2, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 6a674dfc-53fc-471c-88fe-8edc7c8253d0, 40dce8ec-fa27-4751-be8c-c51811457f23 result, different first party: 6720b58b-9811-438a-8c02-553326a3681b, 03476753-a12a-40ff-8c60-664e916115a2, 1f0333cd-1620-4596-ba57-80fb9251d6b5, 6a674dfc-53fc-471c-88fe-8edc7c8253d0, 40dce8ec-fa27-4751-be8c-c51811457f23 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: da37219f-3a36-4d4d-83a6-a2e47f4e008d, 3d6bd76c-5d69-476f-ba11-eef41cd32c34, e72b2aa5-bea7-4dfb-a881-3eb989b37a4f, 68bbbf5b-5a68-4830-8126-c5ca6ee05fe5, 1c0ada6b-a949-4dcd-9a1c-ffe9855b6ea7 result, different first party: , , , , unsupported: false, false, false, false, false passed: true, true, true, true, true test failed: false, false, false, false, false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 3795da0a-9741-498b-be29-f56e717bcdf6, 6b383882-53fe-40cd-9628-3c894f13558b, 18e83d9d-1b5f-4753-83a9-ea3452ca226e, a11115c7-b546-4ea7-b248-92d8f042e458, d1cf6ba2-55e0-4888-bf25-df69939abfb4 result, different first party: 3795da0a-9741-498b-be29-f56e717bcdf6, 6b383882-53fe-40cd-9628-3c894f13558b, 18e83d9d-1b5f-4753-83a9-ea3452ca226e, a11115c7-b546-4ea7-b248-92d8f042e458, d1cf6ba2-55e0-4888-bf25-df69939abfb4 unsupported: false, false, false, false, false passed: false, false, false, false, false test failed: false, false, false, false, false
  write: (secret) => parent.postMessage({"write window.name": secret}) read: () => new Promise((resolve) => { parent.postMessage({"read window.name": true}, "*"); addEventListener("message", ({data}) => { resolve(data); }, { once: true }); }) result, same first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 result, different first party: 14c7fbac-7323-4a4b-bb4e-b66d8a9ba323, 17c98920-e1af-482e-a448-3bb80f87d4aa, fa87a517-a151-4fef-83d4-34deb9c09357, ee88e09d-68a5-4d57-9c1b-83bb3ae21089 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: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: false,false,false,false,false result: Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded,Insecure website loaded
  passed: 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 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: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false 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: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: false,false,false,false,false passed: false,false,false,false,false
  upgraded: true,true,true,true,true passed: true,true,true,true,true
  upgraded: false,false,false,false 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 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 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: 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
IP address leakIP addresses can be used to uniquely identify a large percentage of users. A proxy, VPN, or Tor can mask a user's IP address.
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: false,false,false,false,false
  passed: true,true,true,true,true
  passed: false,false,false,false
Stream isolationBrowsers that use Tor can use a different Tor circuit per top-level website.
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true,true readSameFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported readDifferentFirstParty: Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported,Error: Unsupported testFailed: false,false,false,false,false
  write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: false,false,false,false,false readSameFirstParty: 2602:fc05::12,2605:6400:10:449:d588:761:3910:8268,2a01:4262:1ab:ffff::131,2620:18c:0:192::139,107.189.5.249 readDifferentFirstParty: 31.42.184.136,Error: Unsupported,51.38.127.41,2620:7:6001::173,2a03:4000:66:d6f::5 passed: true,true,true,true,true testFailed: false,false,false,false,false
write: () => { if (!usingTor) { throw new Error("Unsupported"); } } read: async () => { if (usingTor) { return ipAddress; } else { throw new Error("Unsupported"); } } unsupported: true,true,true,true 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: true,true,true,true,true passed: true,true,true,true,true
  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: 1440,1440,1440,1440,1440 desired value: 1340,1340,1340,1340,1340 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1292,1292,1292,1292,1292 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1336,1336,1336,1336,1336 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 983,983,983,983,983 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1310,1310,1310,1310,1310 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 860,860,860,860,860 passed: false,false,false,false,false
  expression: undefined desired expression: innerHeight actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: undefined desired expression: innerHeight actual value: 1440,1440,1440,1440 desired value: 1278,1278,1278,1278 passed: false,false,false,false
Media query screen widthWidth of the user's screen in pixels.
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1237,1237,1237,1237,1237 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1280,1280,1280,1280,1280 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1280,1280,1280,1280,1280 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1240,1240,1240,1240,1240 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1324,1324,1324,1324,1324 passed: false,false,false,false,false
  expression: undefined desired expression: innerWidth actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: undefined desired expression: innerWidth actual value: 2560,2560,2560,2560 desired value: 1405,1405,1405,1405 passed: false,false,false,false
outerHeightHeight of the browser window in pixels, including browser chrome.
  expression: outerHeight desired expression: innerHeight actual value: 1415,1415,1415,1415,1415 desired value: 1340,1340,1340,1340,1340 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1371,1371,1371,1371,1371 desired value: 1292,1292,1292,1292,1292 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1415,1415,1415,1415,1415 desired value: 1336,1336,1336,1336,1336 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1068,1068,1068,1068,1068 desired value: 983,983,983,983,983 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1415,1415,1415,1415,1415 desired value: 1310,1310,1310,1310,1310 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 940,940,940,940,940 desired value: 860,860,860,860,860 passed: false,false,false,false,false
  expression: outerHeight desired expression: innerHeight actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: outerHeight desired expression: innerHeight actual value: 1371,1371,1371,1371 desired value: 1278,1278,1278,1278 passed: false,false,false,false
screen.heightHeight of the user's screen, in pixels.
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1340,1340,1340,1340,1340 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1292,1292,1292,1292,1292 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1336,1336,1336,1336,1336 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 983,983,983,983,983 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 1310,1310,1310,1310,1310 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440,1440 desired value: 860,860,860,860,860 passed: false,false,false,false,false
  expression: screen.height desired expression: innerHeight actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: screen.height desired expression: innerHeight actual value: 1440,1440,1440,1440 desired value: 1278,1278,1278,1278 passed: false,false,false,false
screen.widthWidth of the user's screen, in pixels.
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1237,1237,1237,1237,1237 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1200,1200,1200,1200,1200 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1280,1280,1280,1280,1280 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1280,1280,1280,1280,1280 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1240,1240,1240,1240,1240 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560,2560 desired value: 1324,1324,1324,1324,1324 passed: false,false,false,false,false
  expression: screen.width desired expression: innerWidth actual value: 1000,1000,1000,1000,1000 desired value: 1000,1000,1000,1000,1000 passed: true,true,true,true,true
  expression: screen.width desired expression: innerWidth actual value: 2560,2560,2560,2560 desired value: 1405,1405,1405,1405 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: 22,22,22,22,22 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 66,66,66,66,66 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 3768,3768,3768,3768,3768 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 4,4,4,4,4 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 3840,3840,3840,3840,3840 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 1033,1033,1033,1033,1033 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenX desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenX desired expression: 0 actual value: 0,0,0,0 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: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 25,25,25,25,25 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 148,148,148,148,148 desired value: 0,0,0,0,0 passed: false,false,false,false,false
  expression: screenY desired expression: 0 actual value: 0,0,0,0,0 desired value: 0,0,0,0,0 passed: true,true,true,true,true
  expression: screenY desired expression: 0 actual value: 25,25,25,25 desired value: 0,0,0,0 passed: false,false,false,false
System font detectionWeb pages can detect the presence of a font installed on the user's system. The presence or absence of various fonts is commonly used to fingerprint users.
* * Brave has introduced a new font fingerprinting protection. Results here are pending further analysis passed: true,true,true,false,true
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: false,false,false,false,false
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: false,false,false,false,false
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: false,false,false,false,false
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: false,false,false,false,false
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: true,true,true,true,true
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: true,true,true,true,true
  expression: undefined desired expression: undefined actual value: undefined desired value: undefined passed: false,false,false,false
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: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
__hsscHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
__hstcHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
__sDrip.com email address tracking parameter
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
_hsencHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
_openstatYandex tracking parameter
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
dclidDoubleClick Click ID (Google)
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
fbclidFacebook Click Identifier
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
gclidGoogle Click Identifier
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
hsCtaTrackingHubSpot tracking parameter
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
igshidInstagram tracking parameter
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
mc_eidMailchimp Email ID (email recipient's address)
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
mkt_tokAdobe Marketo tracking parameter
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
ml_subscriberMailerLite email tracking
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
ml_subscriber_hashMailerLite email tracking
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
msclkidMicrosoft Click ID
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
oly_anon_idOmeda marketing 'anonymous' customer id
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
oly_enc_idOmeda marketing 'known' customer id
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
rb_clickidUnknown high-entropy tracking parameter
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
s_cidAdobe Site Catalyst tracking parameter
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
vero_convVero tracking parameter
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
vero_idVero tracking parameter
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
wickedidWicked Reports e-commerce tracking
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false
yclidYandex Click ID
  passed: true,true,true,true,true
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 passed: false,false,false,false,false
  value: 6045609723958876 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: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false,false
  url: https://munchkin.marketo.net/munchkin.js passed: false,false,false,false
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: 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,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: 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,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: 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,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: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false,false
  url: https://bat.bing.com/bat.js passed: false,false,false,false
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: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: false,false,false,false,false
  url: https://static.chartbeat.com/js/chartbeat.js passed: 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: 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,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: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false,false
  url: https://securepubads.g.doubleclick.net/static/glade.js passed: false,false,false,false
Facebook pixelTests whether the browser blocks the page from loading the tracker at https://www.facebook.com/tr?id=123
  url: https://www.facebook.com/tr?id=123 passed: true,true,true,true,true
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false,false
  url: https://www.facebook.com/tr?id=123 passed: false,false,false,false
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: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false,false
  url: https://www.google.com/pagead/1p-user-list/ passed: false,false,false,false
Google AnalyticsTests whether the browser blocks the page from loading the tracker at https://google-analytics.com/urchin.js
  url: https://google-analytics.com/urchin.js passed: true,true,true,true,true
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false,false
  url: https://google-analytics.com/urchin.js passed: false,false,false,false
Google Tag ManagerTests whether the browser blocks the page from loading the tracker at https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: true,true,true,true,true
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false,false
  url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL passed: false,false,false,false
Index ExchangeTests whether the browser blocks the page from loading the tracker at https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: true,true,true,true,true
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false,false
  url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 passed: false,false,false,false
New RelicTests whether the browser blocks the page from loading the tracker at https://js-agent.newrelic.com/nr-1212.min.js
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: true,true,true,true,true
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false,false
  url: https://js-agent.newrelic.com/nr-1212.min.js passed: false,false,false,false
QuantcastTests whether the browser blocks the page from loading the tracker at https://pixel.quantserve.com/pixel
  url: https://pixel.quantserve.com/pixel passed: true,true,true,true,true
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false,false
  url: https://pixel.quantserve.com/pixel passed: false,false,false,false
Scorecard Research BeaconTests whether the browser blocks the page from loading the tracker at https://sb.scorecardresearch.com/internal-c2/default/cs.js
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: true,true,true,true,true
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false,false
  url: https://sb.scorecardresearch.com/internal-c2/default/cs.js passed: false,false,false,false
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: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,false,false
  url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json passed: false,false,false,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: false,false,false,false,false
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: false,false,false,false,false
  url: https://t.co/i/adsct passed: false,false,false,false
Yandex AdsTests whether the browser blocks the page from loading the tracker at https://yandex.ru/ads/system/header-bidding.js
  url: https://yandex.ru/ads/system/header-bidding.js passed: true,true,true,true,true
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false,false
  url: https://yandex.ru/ads/system/header-bidding.js passed: false,false,false,false
Tracking cookie protectionA large fraction of web pages on the web have hidden third-party trackers that read and write cookies in your browser. These cookies can be used to track your browsing across websites. This section checks to see if a browser stops cross-site tracking by cookies from 20 of the largest trackers listed by https://whotracks.me.
AdobeTests whether the browser stops cookies from munchkin.marketo.net from tracking users across websites.
  passed: true,true,true,true,true url: https://munchkin.marketo.net/munchkin.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://munchkin.marketo.net/munchkin.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://munchkin.marketo.net/munchkin.js cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://munchkin.marketo.net/munchkin.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://munchkin.marketo.net/munchkin.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://munchkin.marketo.net/munchkin.js cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://munchkin.marketo.net/munchkin.js cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://munchkin.marketo.net/munchkin.js cookieFound: true,true,true,true
Adobe Audience ManagerTests whether the browser stops cookies from dpm.demdex.net from tracking users across websites.
  passed: true,true,true,true,true url: https://dpm.demdex.net/ibs cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://dpm.demdex.net/ibs cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://dpm.demdex.net/ibs cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://dpm.demdex.net/ibs cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://dpm.demdex.net/ibs cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://dpm.demdex.net/ibs cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://dpm.demdex.net/ibs cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://dpm.demdex.net/ibs cookieFound: true,true,true,true
Amazon adsystemTests whether the browser stops cookies from s.amazon-adsystem.com from tracking users across websites.
  passed: true,true,true,true,true url: https://s.amazon-adsystem.com/dcm cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://s.amazon-adsystem.com/dcm cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://s.amazon-adsystem.com/dcm cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://s.amazon-adsystem.com/dcm cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://s.amazon-adsystem.com/dcm cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://s.amazon-adsystem.com/dcm cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://s.amazon-adsystem.com/dcm cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://s.amazon-adsystem.com/dcm cookieFound: true,true,true,true
AppNexusTests whether the browser stops cookies from ib.adnxs.com from tracking users across websites.
  passed: true,true,true,true,true url: https://ib.adnxs.com/px?id=178248&t=1 cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://ib.adnxs.com/px?id=178248&t=1 cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://ib.adnxs.com/px?id=178248&t=1 cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://ib.adnxs.com/px?id=178248&t=1 cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://ib.adnxs.com/px?id=178248&t=1 cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://ib.adnxs.com/px?id=178248&t=1 cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://ib.adnxs.com/px?id=178248&t=1 cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://ib.adnxs.com/px?id=178248&t=1 cookieFound: true,true,true,true
Bing AdsTests whether the browser stops cookies from bat.bing.com from tracking users across websites.
  passed: true,true,true,true,true url: https://bat.bing.com/bat.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://bat.bing.com/bat.js cookieFound: true,true,true,true,true
  passed: false,false,false,false,false url: https://bat.bing.com/bat.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://bat.bing.com/bat.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://bat.bing.com/bat.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://bat.bing.com/bat.js cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://bat.bing.com/bat.js cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://bat.bing.com/bat.js cookieFound: true,true,true,true
ChartbeatTests whether the browser stops cookies from static.chartbeat.com from tracking users across websites.
  passed: true,true,true,true,true url: https://static.chartbeat.com/js/chartbeat.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://static.chartbeat.com/js/chartbeat.js cookieFound: true,true,true,true,true
  passed: false,false,false,false,false url: https://static.chartbeat.com/js/chartbeat.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://static.chartbeat.com/js/chartbeat.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://static.chartbeat.com/js/chartbeat.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://static.chartbeat.com/js/chartbeat.js cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://static.chartbeat.com/js/chartbeat.js cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://static.chartbeat.com/js/chartbeat.js cookieFound: true,true,true,true
CriteoTests whether the browser stops cookies from dis.criteo.com from tracking users across websites.
  passed: true,true,true,true,true url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://dis.criteo.com/dis/rtb/appnexus/cookiematch.aspx cookieFound: true,true,true,true
DoubleClick (Google)Tests whether the browser stops cookies from securepubads.g.doubleclick.net from tracking users across websites.
  passed: true,true,true,true,true url: https://securepubads.g.doubleclick.net/static/glade.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://securepubads.g.doubleclick.net/static/glade.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://securepubads.g.doubleclick.net/static/glade.js cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://securepubads.g.doubleclick.net/static/glade.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://securepubads.g.doubleclick.net/static/glade.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://securepubads.g.doubleclick.net/static/glade.js cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://securepubads.g.doubleclick.net/static/glade.js cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://securepubads.g.doubleclick.net/static/glade.js cookieFound: true,true,true,true
Facebook pixelTests whether the browser stops cookies from www.facebook.com from tracking users across websites.
  passed: true,true,true,true,true url: https://www.facebook.com/tr?id=123 cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://www.facebook.com/tr?id=123 cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://www.facebook.com/tr?id=123 cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://www.facebook.com/tr?id=123 cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://www.facebook.com/tr?id=123 cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://www.facebook.com/tr?id=123 cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://www.facebook.com/tr?id=123 cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://www.facebook.com/tr?id=123 cookieFound: true,true,true,true
Google (third-party ad pixel)Tests whether the browser stops cookies from www.google.com from tracking users across websites.
  passed: true,true,true,true,true url: https://www.google.com/pagead/1p-user-list/ cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://www.google.com/pagead/1p-user-list/ cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://www.google.com/pagead/1p-user-list/ cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://www.google.com/pagead/1p-user-list/ cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://www.google.com/pagead/1p-user-list/ cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://www.google.com/pagead/1p-user-list/ cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://www.google.com/pagead/1p-user-list/ cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://www.google.com/pagead/1p-user-list/ cookieFound: true,true,true,true
Google AnalyticsTests whether the browser stops cookies from google-analytics.com from tracking users across websites.
  passed: true,true,true,true,true url: https://google-analytics.com/urchin.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://google-analytics.com/urchin.js cookieFound: true,true,true,true,true
  passed: false,false,false,false,false url: https://google-analytics.com/urchin.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://google-analytics.com/urchin.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://google-analytics.com/urchin.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://google-analytics.com/urchin.js cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://google-analytics.com/urchin.js cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://google-analytics.com/urchin.js cookieFound: true,true,true,true
Google Tag ManagerTests whether the browser stops cookies from www.googletagmanager.com from tracking users across websites.
  passed: true,true,true,true,true url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL cookieFound: true,true,true,true,true
  passed: false,false,false,false,false url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://www.googletagmanager.com/gtag.js?id=GTM-NX4SMZL cookieFound: true,true,true,true
Index ExchangeTests whether the browser stops cookies from dsum-sec.casalemedia.com from tracking users across websites.
  passed: true,true,true,true,true url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://dsum-sec.casalemedia.com/crum?cm_dsp_id=10&external_user_id=629685505537&C=1 cookieFound: true,true,true,true
New RelicTests whether the browser stops cookies from js-agent.newrelic.com from tracking users across websites.
  passed: true,true,true,true,true url: https://js-agent.newrelic.com/nr-1212.min.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://js-agent.newrelic.com/nr-1212.min.js cookieFound: true,true,true,true,true
  passed: false,false,false,false,false url: https://js-agent.newrelic.com/nr-1212.min.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://js-agent.newrelic.com/nr-1212.min.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://js-agent.newrelic.com/nr-1212.min.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://js-agent.newrelic.com/nr-1212.min.js cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://js-agent.newrelic.com/nr-1212.min.js cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://js-agent.newrelic.com/nr-1212.min.js cookieFound: true,true,true,true
QuantcastTests whether the browser stops cookies from pixel.quantserve.com from tracking users across websites.
  passed: true,true,true,true,true url: https://pixel.quantserve.com/pixel cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://pixel.quantserve.com/pixel cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://pixel.quantserve.com/pixel cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://pixel.quantserve.com/pixel cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://pixel.quantserve.com/pixel cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://pixel.quantserve.com/pixel cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://pixel.quantserve.com/pixel cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://pixel.quantserve.com/pixel cookieFound: true,true,true,true
Scorecard Research BeaconTests whether the browser stops cookies from sb.scorecardresearch.com from tracking users across websites.
  passed: true,true,true,true,true url: https://sb.scorecardresearch.com/internal-c2/default/cs.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://sb.scorecardresearch.com/internal-c2/default/cs.js cookieFound: true,true,true,true,true
  passed: false,false,false,false,false url: https://sb.scorecardresearch.com/internal-c2/default/cs.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://sb.scorecardresearch.com/internal-c2/default/cs.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://sb.scorecardresearch.com/internal-c2/default/cs.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://sb.scorecardresearch.com/internal-c2/default/cs.js cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://sb.scorecardresearch.com/internal-c2/default/cs.js cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://sb.scorecardresearch.com/internal-c2/default/cs.js cookieFound: true,true,true,true
TaboolaTests whether the browser stops cookies from trc.taboola.com from tracking users across websites.
  passed: true,true,true,true,true url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://trc.taboola.com/futureplc-tomsguide/trc/3/json cookieFound: true,true,true,true
Twitter pixelTests whether the browser stops cookies from t.co from tracking users across websites.
  passed: true,true,true,true,true url: https://t.co/i/adsct cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://t.co/i/adsct cookieFound: true,true,true,true,true
  passed: false,false,false,false,false url: https://t.co/i/adsct cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://t.co/i/adsct cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://t.co/i/adsct cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://t.co/i/adsct cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://t.co/i/adsct cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://t.co/i/adsct cookieFound: true,true,true,true
Yandex AdsTests whether the browser stops cookies from yandex.ru from tracking users across websites.
  passed: true,true,true,true,true url: https://yandex.ru/ads/system/header-bidding.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://yandex.ru/ads/system/header-bidding.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://yandex.ru/ads/system/header-bidding.js cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://yandex.ru/ads/system/header-bidding.js cookieFound: false,false,false,false,false
  passed: false,false,false,false,false url: https://yandex.ru/ads/system/header-bidding.js cookieFound: true,true,true,true,true
  passed: true,true,true,true,true url: https://yandex.ru/ads/system/header-bidding.js cookieFound: false,false,false,false,false
  passed: true,true,true,true,true url: https://yandex.ru/ads/system/header-bidding.js cookieFound: false,false,false,false,false
  passed: false,false,false,false url: https://yandex.ru/ads/system/header-bidding.js cookieFound: true,true,true,true