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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Fingerprint Detector — Test Harness</title>
<style>
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
background: #1a1a2e;
color: #e0e0e0;
padding: 20px;
max-width: 900px;
margin: 0 auto;
}
h1 { color: #e94560; margin-bottom: 8px; }
p.intro { color: #90a4ae; margin-bottom: 20px; font-size: 14px; line-height: 1.6; }
.run-all {
background: #e94560; color: white; border: none; padding: 10px 20px;
font-size: 14px; font-weight: 600; cursor: pointer; border-radius: 4px;
margin-bottom: 20px;
}
.run-all:hover { background: #c62b47; }
section {
background: #16213e; border: 1px solid #0f3460; border-radius: 6px;
padding: 12px 16px; margin-bottom: 12px;
}
section.interactive { border-color: #fb8c00; }
h2 {
font-size: 15px; color: #e94560; margin-bottom: 8px;
display: flex; justify-content: space-between; align-items: center;
}
section.interactive h2 { color: #fb8c00; }
h2 button {
background: #0f3460; color: #e0e0e0; border: 1px solid #0f3460;
padding: 4px 12px; font-size: 12px; cursor: pointer; border-radius: 4px;
}
h2 button:hover { background: #1a2a4f; }
h2 button.ok { background: #43a047; border-color: #43a047; }
h2 button.err { background: #e53935; border-color: #e53935; }
ul.ops { list-style: none; font-size: 12px; color: #78909c; margin-top: 6px; }
ul.ops li {
font-family: Consolas, "Liberation Mono", Menlo, "Courier New", monospace;
padding: 2px 0;
}
ul.ops li::before { content: "→ "; color: #546e7a; }
.notice {
background: #fb8c0022; border-left: 3px solid #fb8c00;
padding: 8px 12px; margin-bottom: 16px; font-size: 13px; color: #ffb74d;
}
.bait { position: absolute; left: -9999px; }
</style>
</head>
<body>
<h1>Fingerprint Detector — Test Harness</h1>
<p class="intro">
Each button below triggers a category of fingerprinting APIs. Open the extension popup's
<strong>Debug Log</strong> panel before running tests to see which hooks fire.
Click <strong>Run All</strong> to execute every non-interactive test. Interactive tests
(orange) require a click each — some may show browser prompts for permissions.
</p>
<button class="run-all" id="run-all">▶ Run All Non-Interactive Tests</button>
<!-- ══════════════════════ AUTO TESTS ══════════════════════ -->
<section data-test="canvas">
<h2>Canvas <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="webgl">
<h2>WebGL <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="audio">
<h2>Audio <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="navigator">
<h2>Navigator / UA <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="clientHints">
<h2>Client Hints <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="screen">
<h2>Screen <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="fonts">
<h2>Fonts <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="webrtc">
<h2>WebRTC <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="network">
<h2>Network <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="storage">
<h2>Storage <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="timing">
<h2>Timing <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="privacy">
<h2>Privacy / HeadlessDetect <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="hardware">
<h2>Hardware (WebGPU / Sensors) <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="adblock">
<h2>AdBlock Detection <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="intl">
<h2>Intl / Timezone <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="math">
<h2>Math / Architecture <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="touch">
<h2>Touch <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="document">
<h2>Document Metadata (referrer, window.name, hasFocus) <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="media">
<h2>Media (codec detection) <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="extensionProbe">
<h2>Extension Detection Probes <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="vendor">
<h2>Vendor Detection (Brave/Opera/Vivaldi/CSS prefixes) <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="workers">
<h2>Workers / SharedArrayBuffer / CacheStorage <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="behavior">
<h2>Behavior (synthetic event property reads) <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="clientRects">
<h2>ClientRects / getBoundingClientRect <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="misc">
<h2>Misc (ApplePay, openDatabase, PrivateClick, SpeechSynthesis) <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="fingerprintjsDetect">
<h2>FingerprintJS Library Detection (simulated signals) <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="matomoDetect">
<h2>Matomo / Piwik Library Detection (simulated signals) <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="akamaiBotManagerDetect">
<h2>Akamai Bot Manager Detection (simulated signals) <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section data-test="otherTrackerLibs">
<h2>Cloudflare / DataDome / PerimeterX / Imperva / Kasada / Piano / Hotjar / Meta Pixel / Bing UET / Parse.ly / New Relic / Blockthrough / Admiral / Publift Fuse / Media.net / Tealium / WP.com Stats / Comscore / Google Tag / GPT / Yahoo / Kameleoon / Webtrekk / Pushly / Quantcast / Clarity / RUM Vision / Nativo / Geniuslink / Google FC / Chartbeat / Ziff Davis / HubSpot / LinkedIn / Noibu / Criteo / OneTrust / Transcend / mPulse / LogRocket / ThreatMetrix / LUX / Insider / BrightEdge / Qualtrics / Klaviyo / Adobe DTM / Adobe Commerce / Adobe Recs / Osano / Salesforce MC / Helix RUM / Elastic APM / Sentry / Awin / Bazaarvoice / FigPii / iubenda / accessiBe / Usercentrics / Swan / Global-e / TrueVault / Listrak / TrustedSite / IAS / Adobe Analytics / Dynatrace / Branch / Cloudflare Analytics / Sourcepoint / Yotpo (simulated signals) <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<!-- ══════════════════════ INTERACTIVE TESTS ══════════════════════ -->
<div class="notice">
The tests below require a click each. Some trigger browser permission prompts
(camera, microphone, clipboard, notifications, geolocation, etc.) — you don't
have to accept them; just triggering the API is enough for the hook to fire.
</div>
<section class="interactive" data-test="notification">
<h2>Notification API <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section class="interactive" data-test="permissionsQuery">
<h2>Permissions Query <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section class="interactive" data-test="geolocation">
<h2>Geolocation <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section class="interactive" data-test="clipboard">
<h2>Clipboard <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section class="interactive" data-test="mediaDevices">
<h2>Media Devices (camera / mic / screen) <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section class="interactive" data-test="fileSystem">
<h2>File System Access <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section class="interactive" data-test="webauthn">
<h2>WebAuthn <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section class="interactive" data-test="payment">
<h2>Payment Request <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section class="interactive" data-test="wakeLock">
<h2>Wake Lock / Idle / Badging / MIDI <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<section class="interactive" data-test="deviceRequest">
<h2>Hardware Device Chooser (Bluetooth / USB / Serial / HID) <button class="run-btn">Run</button></h2>
<ul class="ops"></ul>
</section>
<script>
// Utility: swallow errors so one failing call doesn't halt the whole test
const tryCall = (fn) => { try { return fn(); } catch (e) { return undefined; } };
// Each test returns an array of string descriptions of what it called
const tests = {
canvas() {
const c = document.createElement("canvas");
c.width = 50; c.height = 20;
const ctx = c.getContext("2d");
ctx.fillStyle = "#f60";
ctx.fillRect(0, 0, 50, 20);
ctx.fillStyle = "#069";
ctx.font = "12px Arial";
ctx.fillText("fingerprint", 2, 14);
ctx.strokeText("x", 40, 14);
ctx.measureText("fingerprint");
ctx.isPointInPath(1, 1);
ctx.isPointInStroke(1, 1);
c.toDataURL();
ctx.getImageData(0, 0, 1, 1);
if (typeof OffscreenCanvas !== "undefined") {
const osc = tryCall(() => new OffscreenCanvas(10, 10));
tryCall(() => osc && osc.getContext("2d"));
if (osc && osc.convertToBlob) osc.convertToBlob().catch(() => {});
if (osc && osc.transferToImageBitmap) tryCall(() => osc.transferToImageBitmap());
}
// createImageBitmap from a canvas source
if (typeof window.createImageBitmap === "function") {
createImageBitmap(c).then(b => b.close && b.close()).catch(() => {});
}
// captureStream — MediaStream from canvas (WebRTC fingerprinting vector)
if (typeof c.captureStream === "function") {
try {
const stream = c.captureStream(0);
stream.getTracks().forEach(t => t.stop());
} catch (_) {}
}
// getContext with explicit attrs — tests our attrs inspection
tryCall(() => document.createElement("canvas").getContext("webgl", { powerPreference: "high-performance" }));
return [
'getContext("2d")', "fillText", "strokeText", "measureText",
"isPointInPath", "isPointInStroke", "toDataURL", "getImageData",
"new OffscreenCanvas", "OffscreenCanvas.getContext", "OffscreenCanvas.convertToBlob",
"OffscreenCanvas.transferToImageBitmap",
"createImageBitmap(canvas)",
"HTMLCanvasElement.captureStream",
'getContext("webgl", {powerPreference})'
];
},
webgl() {
const c = document.createElement("canvas");
const gl = c.getContext("webgl") || c.getContext("experimental-webgl");
if (!gl) return ["(WebGL unavailable)"];
gl.getParameter(gl.VENDOR);
gl.getParameter(gl.RENDERER);
gl.getParameter(gl.VERSION);
gl.getParameter(gl.MAX_TEXTURE_SIZE);
gl.getSupportedExtensions();
const dbg = gl.getExtension("WEBGL_debug_renderer_info");
if (dbg) {
gl.getParameter(dbg.UNMASKED_VENDOR_WEBGL);
gl.getParameter(dbg.UNMASKED_RENDERER_WEBGL);
}
gl.getShaderPrecisionFormat(gl.FRAGMENT_SHADER, gl.HIGH_FLOAT);
gl.getContextAttributes();
// Set up a minimal-but-valid WebGL state so the draw / buffer /
// framebuffer / renderbuffer calls below don't log
// INVALID_OPERATION errors in the devtools console. The hooks
// fire either way, but with real state set up the calls are
// clean no-ops (count=0 draws on a valid linked program).
const vs = gl.createShader(gl.VERTEX_SHADER);
gl.shaderSource(vs, "void main(){gl_Position=vec4(0);}");
gl.compileShader(vs);
gl.getShaderParameter(vs, gl.COMPILE_STATUS);
gl.getShaderInfoLog(vs);
const fs = gl.createShader(gl.FRAGMENT_SHADER);
gl.shaderSource(fs, "void main(){gl_FragColor=vec4(0);}");
gl.compileShader(fs);
const prog = gl.createProgram();
gl.attachShader(prog, vs);
gl.attachShader(prog, fs);
gl.linkProgram(prog);
gl.getProgramParameter(prog, gl.LINK_STATUS);
gl.getProgramInfoLog(prog);
gl.useProgram(prog);
// Bind a vertex buffer + element buffer — getBufferParameter
// and drawElements need a bound buffer of each type.
const vbo = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vbo);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(0), gl.STATIC_DRAW);
const ibo = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, ibo);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(0), gl.STATIC_DRAW);
// Bind a renderbuffer for getRenderbufferParameter
const rbo = gl.createRenderbuffer();
gl.bindRenderbuffer(gl.RENDERBUFFER, rbo);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA4, 1, 1);
// Bind a framebuffer with an attachment for
// getFramebufferAttachmentParameter
const fbo = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, rbo);
// Now the real test calls — all no-ops on valid state
gl.drawArrays(gl.TRIANGLES, 0, 0);
gl.drawElements(gl.TRIANGLES, 0, gl.UNSIGNED_SHORT, 0);
gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array(4));
gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE);
gl.getRenderbufferParameter(gl.RENDERBUFFER, gl.RENDERBUFFER_WIDTH);
gl.getFramebufferAttachmentParameter(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE);
// WebGL2 extras — same setup, same clean state
const c2 = document.createElement("canvas");
const gl2 = c2.getContext("webgl2");
if (gl2) {
const vs2 = gl2.createShader(gl2.VERTEX_SHADER);
gl2.shaderSource(vs2, "#version 300 es\nvoid main(){gl_Position=vec4(0);}");
gl2.compileShader(vs2);
const fs2 = gl2.createShader(gl2.FRAGMENT_SHADER);
gl2.shaderSource(fs2, "#version 300 es\nout mediump vec4 o;void main(){o=vec4(0);}");
gl2.compileShader(fs2);
const prog2 = gl2.createProgram();
gl2.attachShader(prog2, vs2);
gl2.attachShader(prog2, fs2);
gl2.linkProgram(prog2);
gl2.useProgram(prog2);
const ibo2 = gl2.createBuffer();
gl2.bindBuffer(gl2.ELEMENT_ARRAY_BUFFER, ibo2);
gl2.bufferData(gl2.ELEMENT_ARRAY_BUFFER, new Uint16Array(0), gl2.STATIC_DRAW);
gl2.getInternalformatParameter(gl2.RENDERBUFFER, gl2.RGBA8, gl2.SAMPLES);
gl2.getIndexedParameter(gl2.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0);
gl2.drawArraysInstanced(gl2.TRIANGLES, 0, 0, 1);
gl2.drawElementsInstanced(gl2.TRIANGLES, 0, gl2.UNSIGNED_SHORT, 0, 1);
gl2.drawRangeElements(gl2.TRIANGLES, 0, 0, 0, gl2.UNSIGNED_SHORT, 0);
}
return [
"getParameter (VENDOR/RENDERER/VERSION/MAX_TEXTURE_SIZE)",
"getSupportedExtensions",
'getExtension("WEBGL_debug_renderer_info")',
"UNMASKED_VENDOR/RENDERER_WEBGL",
"getShaderPrecisionFormat", "getContextAttributes",
"createShader / shaderSource / compileShader",
"getShaderParameter / getShaderInfoLog",
"createProgram / linkProgram / getProgramParameter / getProgramInfoLog",
"drawArrays / drawElements / readPixels",
"getBufferParameter / getRenderbufferParameter / getFramebufferAttachmentParameter",
"WebGL2: getInternalformatParameter / getIndexedParameter",
"WebGL2: drawArraysInstanced / drawElementsInstanced / drawRangeElements",
];
},
audio() {
const AC = window.AudioContext || window.webkitAudioContext;
if (!AC) return ["(AudioContext unavailable)"];
const ctx = new AC();
tryCall(() => ctx.createOscillator());
tryCall(() => ctx.createDynamicsCompressor());
tryCall(() => ctx.createGain());
tryCall(() => ctx.createBiquadFilter());
tryCall(() => ctx.createBufferSource());
// Note: createScriptProcessor emits a one-time Chromium
// deprecation warning ("The ScriptProcessorNode is deprecated.
// Use AudioWorkletNode instead.") — that's a legitimate
// browser notice, not an error. The hook fires anyway and
// the notice doesn't affect test behavior.
tryCall(() => ctx.createScriptProcessor(256, 1, 1));
const buffer = tryCall(() => ctx.createBuffer(1, 1024, ctx.sampleRate));
// AudioBuffer reads
if (buffer) {
tryCall(() => buffer.getChannelData(0));
if (buffer.copyFromChannel) {
tryCall(() => buffer.copyFromChannel(new Float32Array(1024), 0));
}
}
// Analyser methods — the heart of AudioContext fingerprinting
const analyser = tryCall(() => ctx.createAnalyser());
if (analyser) {
tryCall(() => analyser.getFloatFrequencyData(new Float32Array(analyser.frequencyBinCount)));
tryCall(() => analyser.getByteFrequencyData(new Uint8Array(analyser.frequencyBinCount)));
tryCall(() => analyser.getFloatTimeDomainData(new Float32Array(analyser.fftSize)));
tryCall(() => analyser.getByteTimeDomainData(new Uint8Array(analyser.fftSize)));
// AudioNode.connect — connect analyser to destination
tryCall(() => analyser.connect(ctx.destination));
}
// All the AudioContext getters
void ctx.sampleRate;
void ctx.baseLatency;
void ctx.outputLatency;
void ctx.state;
void ctx.destination;
// OfflineAudioContext + startRendering
if (typeof OfflineAudioContext !== "undefined") {
const oac = tryCall(() => new OfflineAudioContext(1, 1024, 44100));
if (oac) tryCall(() => oac.startRendering && oac.startRendering().catch(() => {}));
}
tryCall(() => ctx.close && ctx.close());
return [
"new AudioContext",
"createOscillator / DynamicsCompressor / Gain / BiquadFilter",
"createBufferSource / createScriptProcessor / createBuffer",
"AudioBuffer.getChannelData / copyFromChannel",
"AnalyserNode.getFloat/ByteFrequencyData, getFloat/ByteTimeDomainData",
"AudioNode.connect",
"sampleRate / baseLatency / outputLatency / state / destination getters",
"new OfflineAudioContext + startRendering",
];
},
navigator() {
const props = [
"userAgent", "appVersion", "appName", "platform", "oscpu",
"language", "languages", "hardwareConcurrency", "deviceMemory",
"maxTouchPoints", "vendor", "productSub", "buildID", "connection",
"plugins", "mimeTypes", "pdfViewerEnabled", "doNotTrack",
"webdriver", "cookieEnabled", "onLine",
];
for (const p of props) void navigator[p];
// Methods
if (navigator.getBattery) navigator.getBattery().catch(() => {});
if (navigator.getGamepads) tryCall(() => navigator.getGamepads());
if (Navigator.prototype.javaEnabled) tryCall(() => navigator.javaEnabled());
// ServiceWorker registration (access-based — just reading the method triggers)
if (typeof ServiceWorkerContainer !== "undefined") {
void ServiceWorkerContainer.prototype.register;
void ServiceWorkerContainer.prototype.getRegistrations;
void ServiceWorkerContainer.prototype.getRegistration;
}
// serviceWorker.ready / .controller getters (hooked via hookGetter
// on ServiceWorkerContainer.prototype)
tryCall(() => { void navigator.serviceWorker && navigator.serviceWorker.ready; });
tryCall(() => { void navigator.serviceWorker && navigator.serviceWorker.controller; });
return [
"navigator." + props.join(", ."),
"navigator.getBattery / getGamepads / javaEnabled",
"ServiceWorkerContainer.register/getRegistrations/getRegistration (access)",
"navigator.serviceWorker.ready / .controller (getters)",
];
},
clientHints() {
if (navigator.userAgentData) {
void navigator.userAgentData;
navigator.userAgentData.getHighEntropyValues(["architecture", "model", "platform", "platformVersion", "bitness", "fullVersionList"]).catch(() => {});
void navigator.userAgentData.mobile;
void navigator.userAgentData.platform;
if (typeof navigator.userAgentData.toJSON === "function") {
tryCall(() => navigator.userAgentData.toJSON());
}
}
void navigator.globalPrivacyControl;
// Accept-CH meta tag injection (passive detection — tests
// whether client-hints.js picks up a late-added meta tag)
const m = document.createElement("meta");
m.setAttribute("http-equiv", "Accept-CH");
m.setAttribute("content", "sec-ch-ua, device-memory, downlink");
document.head.appendChild(m);
setTimeout(() => { try { document.head.removeChild(m); } catch (_) {} }, 100);
return [
"navigator.userAgentData + getHighEntropyValues",
"userAgentData.mobile / .platform / .toJSON",
"navigator.globalPrivacyControl",
'<meta http-equiv="Accept-CH">',
];
},
screen() {
for (const p of ["width", "height", "availWidth", "availHeight", "colorDepth", "pixelDepth", "availLeft", "availTop"]) {
void screen[p];
}
void window.devicePixelRatio;
// ScreenOrientation API
if (screen.orientation) {
void screen.orientation.type;
void screen.orientation.angle;
if (typeof screen.orientation.lock === "function") {
screen.orientation.lock("portrait-primary").catch(() => {});
}
if (typeof screen.orientation.unlock === "function") {
tryCall(() => screen.orientation.unlock());
}
}
return [
"screen.* properties + window.devicePixelRatio",
"screen.orientation.type / angle / lock / unlock",
];
},
fonts() {
// Trip the offsetWidth/offsetHeight font-probe detector
const el = document.createElement("span");
el.style.fontFamily = "Arial, sans-serif";
el.style.fontSize = "72px";
el.style.visibility = "hidden";
el.textContent = "fingerprint";
document.body.appendChild(el);
void el.offsetWidth; void el.offsetHeight;
void el.scrollWidth; void el.scrollHeight;
// system font keyword probe
el.style.fontFamily = "system-ui";
void el.offsetWidth;
document.body.removeChild(el);
// FontFaceSet
if (document.fonts) {
tryCall(() => document.fonts.check("12px Arial"));
document.fonts.load("12px Arial").catch(() => {});
tryCall(() => document.fonts.forEach(() => {}));
void document.fonts.ready;
}
return [
"offsetWidth/offsetHeight font probes",
"system-ui keyword probe",
"document.fonts.check / load / forEach / ready",
];
},
webrtc() {
if (typeof RTCPeerConnection === "undefined") return ["(WebRTC unavailable)"];
const pc = new RTCPeerConnection({ iceServers: [{ urls: "stun:stun.l.google.com:19302" }] });
pc.createDataChannel("fingerprint");
pc.createOffer().catch(() => {});
pc.createAnswer().catch(() => {});
// setLocalDescription / setRemoteDescription need a valid
// description; these will reject, but our hook fires first.
tryCall(() => pc.setLocalDescription({ type: "offer", sdp: "" }).catch(() => {}));
tryCall(() => pc.setRemoteDescription({ type: "answer", sdp: "" }).catch(() => {}));
pc.addEventListener("icecandidate", () => {});
if (window.RTCRtpSender && RTCRtpSender.getCapabilities) {
RTCRtpSender.getCapabilities("audio");
RTCRtpSender.getCapabilities("video");
}
if (window.RTCRtpReceiver && RTCRtpReceiver.getCapabilities) {
RTCRtpReceiver.getCapabilities("audio");
}
pc.close();
return [
"new RTCPeerConnection (with STUN server)",
"createDataChannel / createOffer / createAnswer",
"setLocalDescription / setRemoteDescription",
'addEventListener("icecandidate")',
"RTCRtpSender.getCapabilities / RTCRtpReceiver.getCapabilities",
];
},
network() {
if (navigator.connection) {
void navigator.connection.effectiveType;
void navigator.connection.downlink;
void navigator.connection.rtt;
void navigator.connection.saveData;
}
// WebSocket probe — construct with a known-unreachable port
tryCall(() => {
const ws = new WebSocket("ws://127.0.0.1:1/");
setTimeout(() => { try { ws.close(); } catch (_) {} }, 10);
});
return [
"navigator.connection.* props",
"new WebSocket (local probe)",
];
},
storage() {
void navigator.cookieEnabled;
tryCall(() => { localStorage.setItem("fp-test", "x"); });
tryCall(() => localStorage.getItem("fp-test"));
tryCall(() => localStorage.removeItem("fp-test"));
tryCall(() => { void localStorage.length; });
tryCall(() => { void document.cookie; });
tryCall(() => { document.cookie = "fp-test=1; path=/; max-age=1"; });
// StorageManager — all three
if (navigator.storage) {
if (navigator.storage.estimate) navigator.storage.estimate().catch(() => {});
if (navigator.storage.persisted) navigator.storage.persisted().catch(() => {});
// persist() actually requests persistent storage — noisy on some
// browsers but the hook fires regardless
if (navigator.storage.persist) navigator.storage.persist().catch(() => {});
}
// Full IndexedDB read pipeline: open → createObjectStore →
// transaction → get/getAll/count/getAllKeys → close
if (window.indexedDB) {
tryCall(() => indexedDB.databases && indexedDB.databases().catch(() => {}));
try {
const req = indexedDB.open("fp-test-db", 1);
req.onupgradeneeded = (e) => {
const db = e.target.result;
if (!db.objectStoreNames.contains("store1")) {
db.createObjectStore("store1");
}
void db.objectStoreNames; // getter read
};
req.onsuccess = (e) => {
const db = e.target.result;
try {
const tx = db.transaction("store1", "readonly");
const store = tx.objectStore("store1");
store.get("x");
store.getAll();
store.count();
store.getAllKeys();
} catch (_) {}
setTimeout(() => { try { db.close(); } catch (_) {} }, 50);
};
req.onerror = () => {};
} catch (_) {}
}
if (typeof BroadcastChannel !== "undefined") {
tryCall(() => { const bc = new BroadcastChannel("fp-test"); bc.close(); });
}
// Deprecated WebSQL — still present on Chrome < 119
if (typeof window.openDatabase === "function") {
tryCall(() => openDatabase("fp-test", "1", "fp-test", 1024));
}
// Storage Access API — 3rd-party context detection
if (typeof document.hasStorageAccess === "function") {
document.hasStorageAccess().catch(() => {});
}
if (typeof document.requestStorageAccess === "function") {
// Will reject without user gesture; we just need the hook to fire
document.requestStorageAccess().catch(() => {});
}
if (typeof document.requestStorageAccessFor === "function") {
document.requestStorageAccessFor("https://example.com").catch(() => {});
}
return [
"navigator.cookieEnabled",
"localStorage setItem / getItem / removeItem / length",
"document.cookie (get + set)",
"navigator.storage.estimate / persisted / persist",
"indexedDB.databases / open",
"IDBDatabase.createObjectStore / transaction / close / objectStoreNames",
"IDBObjectStore.get / getAll / count / getAllKeys",
"new BroadcastChannel",
"window.openDatabase (if present)",
];
},
timing() {
performance.now();
tryCall(() => performance.getEntries());
tryCall(() => performance.getEntriesByType("navigation"));
tryCall(() => performance.getEntriesByName("fp-mark"));
tryCall(() => performance.mark("fp-mark"));
tryCall(() => performance.measure("fp-measure", "fp-mark"));
void performance.timeOrigin;
if (performance.memory) void performance.memory.usedJSHeapSize;
tryCall(() => {
const obs = new PerformanceObserver(() => {});
obs.observe({ entryTypes: ["resource"] });
setTimeout(() => obs.disconnect(), 10);
});
// PerformanceResourceTiming property getters — network fingerprinting
// via DNS/TCP/TLS timing. Iterate whatever resource entries exist.
const resources = tryCall(() => performance.getEntriesByType("resource"));
if (resources && resources.length > 0) {
const r = resources[0];
void r.domainLookupStart; void r.domainLookupEnd;
void r.connectStart; void r.connectEnd;
void r.secureConnectionStart;
void r.requestStart; void r.responseStart; void r.responseEnd;
void r.redirectStart; void r.redirectEnd;
void r.workerStart;
void r.nextHopProtocol;
}
return [
"performance.now",
"performance.getEntries / getEntriesByType / getEntriesByName",
"performance.mark / measure",
"performance.timeOrigin / memory",
"new PerformanceObserver",
"PerformanceResourceTiming.domainLookup/connect/secureConnection/request/response/redirect/workerStart/nextHopProtocol",
];
},
privacy() {
void navigator.doNotTrack;
void navigator.webdriver;
// share / canShare are access-based — just reading the property
// fires the hook, no need to actually invoke
void navigator.share;
void navigator.canShare;
if (window.visualViewport) {
void visualViewport.width;
void visualViewport.height;
void visualViewport.scale;
void visualViewport.offsetTop;
void visualViewport.offsetLeft;
}
void window.outerWidth; void window.outerHeight;
void window.innerWidth; void window.innerHeight;
void window.screenX; void window.screenY;
void window.isSecureContext;
void document.hidden; void document.visibilityState;
void document.fullscreenElement;
void document.fullscreenEnabled;
// Anti-spoofing probe — call toString on a well-known native method
tryCall(() => Function.prototype.toString.call(CanvasRenderingContext2D.prototype.getImageData));
// Object.prototype.toString proxy-tamper probe (Akamai pattern)
tryCall(() => Object.prototype.toString.call(window));
tryCall(() => Object.prototype.toString.call(navigator));
tryCall(() => Object.prototype.toString.call(document));
// Error.stack engine-format fingerprinting (Firefox / Safari only —
// V8 doesn't expose stack as a prototype accessor)
try { void new Error().stack; } catch (_) {}
// navigator.userActivation — bot detection signal
if (navigator.userActivation) {
void navigator.userActivation.isActive;
void navigator.userActivation.hasBeenActive;
}
// document.currentScript — tracker self-identification
void document.currentScript;
return [
"navigator.doNotTrack / webdriver",
"navigator.share / canShare (access-based)",
"visualViewport.width / height / scale / offsetTop / offsetLeft",
"window.outer* / inner* / screen* / isSecureContext",
"document.hidden / visibilityState / fullscreenElement / fullscreenEnabled",
"Function.prototype.toString (anti-spoofing probe)",
"Object.prototype.toString.call(window/navigator/document)",
"new Error().stack (engine fingerprint, Firefox/Safari)",
"navigator.userActivation.isActive / hasBeenActive",
"document.currentScript",
];
},
hardware() {
if (navigator.gpu) {
navigator.gpu.requestAdapter().catch(() => {});
}
for (const s of ["Accelerometer", "Gyroscope", "Magnetometer"]) {
if (window[s]) tryCall(() => new window[s]());
}
if (navigator.keyboard && navigator.keyboard.getLayoutMap) {
navigator.keyboard.getLayoutMap().catch(() => {});
}
return [
"navigator.gpu.requestAdapter",
"new Accelerometer / Gyroscope / Magnetometer",
"navigator.keyboard.getLayoutMap",
];
},
adblock() {
// Known FingerprintJS bait class
const el = document.createElement("div");
el.className = "adsbox";
el.id = "ad_300X250";
el.style.position = "absolute";
el.style.left = "-9999px";
document.body.appendChild(el);
// Trigger offsetParent burst
for (let i = 0; i < 20; i++) void el.offsetParent;
document.body.removeChild(el);
// Create-remove cycle — 25 direct children of body
for (let i = 0; i < 25; i++) {
const d = document.createElement("div");
d.className = "sponsored-text-link";
document.body.appendChild(d);
document.body.removeChild(d);
}
return [
"known bait element (id=ad_300X250, class=adsbox)",
"offsetParent burst (20 reads)",
"create-remove cycle (25 body children)",
];
},
intl() {
// Timezone
new Date().getTimezoneOffset();
// Intl.DateTimeFormat
const dtf = new Intl.DateTimeFormat();
dtf.resolvedOptions();
// Intl.NumberFormat — resolvedOptions + .format getter + call
const nf = new Intl.NumberFormat();
nf.resolvedOptions();
void nf.format; // getter read
nf.format(123.456); // implicit getter read + invoke
// Intl.Collator — resolvedOptions + .compare getter + call
const col = new Intl.Collator();
col.resolvedOptions();
void col.compare;
col.compare("a", "b");
// Intl.DisplayNames — of + resolvedOptions
if (Intl.DisplayNames) {
const dn = new Intl.DisplayNames(["en"], { type: "language" });
dn.of("fr");
dn.resolvedOptions();
}
// Intl.Locale property getters
if (Intl.Locale) {
const loc = new Intl.Locale("en-US");
for (const prop of ["language", "region", "script", "calendar", "numberingSystem", "hourCycle", "baseName"]) {
void loc[prop];
}
}
// Intl.ListFormat / PluralRules / RelativeTimeFormat / Segmenter
for (const cls of ["ListFormat", "PluralRules", "RelativeTimeFormat", "Segmenter"]) {
if (Intl[cls]) {
tryCall(() => new Intl[cls]("en").resolvedOptions());
}
}
// Intl.supportedValuesOf
if (typeof Intl.supportedValuesOf === "function") {
Intl.supportedValuesOf("calendar");
}
// Locale-dependent formatting
(123.456).toLocaleString();
new Date().toLocaleString();
new Date().toLocaleDateString();
new Date().toLocaleTimeString();
[1, 2, 3].toLocaleString();
return [
"Date.getTimezoneOffset",
"Intl.DateTimeFormat.resolvedOptions",
"Intl.NumberFormat.resolvedOptions / .format getter + call",
"Intl.Collator.resolvedOptions / .compare getter + call",
"Intl.DisplayNames.of + resolvedOptions",
"Intl.Locale.language/region/script/calendar/numberingSystem/hourCycle/baseName",
"Intl.ListFormat / PluralRules / RelativeTimeFormat / Segmenter .resolvedOptions",
"Intl.supportedValuesOf",
"Number / Date / Array .toLocaleString",
];
},
math() {
Math.acos(0.1); Math.asin(0.1); Math.atan(0.1);
Math.acosh(2); Math.asinh(1); Math.atanh(0.5);
Math.cos(1); Math.sin(1); Math.tan(1);
Math.cosh(1); Math.sinh(1); Math.tanh(1);
Math.exp(1); Math.expm1(1); Math.log1p(1);
// Architecture probe (FingerprintJS NaN bit pattern)
tryCall(() => { new Float32Array(1); });
return [
"Math.acos/asin/atan + acosh/asinh/atanh",
"Math.cos/sin/tan + cosh/sinh/tanh",
"Math.exp/expm1/log1p",
"new Float32Array(1) (architecture probe)",
];
},
touch() {
void window.ontouchstart;
tryCall(() => document.createEvent("TouchEvent"));
return [
"window.ontouchstart",
'document.createEvent("TouchEvent")',
];
},
document() {
void document.referrer;
void window.name;
window.name = "fp-test-" + Date.now();
document.hasFocus();
return [
"document.referrer",
"window.name (get + set)",
"document.hasFocus",
];
},
media() {
const v = document.createElement("video");
v.canPlayType('video/mp4; codecs="avc1.42E01E"');
v.canPlayType('video/webm; codecs="vp9"');
v.canPlayType('audio/mp4; codecs="mp4a.40.2"');
if (window.MediaRecorder && MediaRecorder.isTypeSupported) {
MediaRecorder.isTypeSupported("video/webm");
MediaRecorder.isTypeSupported('video/webm; codecs="vp9"');
}
// WebCodec API — newer codec capability probing
if (typeof VideoDecoder === "function" && VideoDecoder.isConfigSupported) {
VideoDecoder.isConfigSupported({ codec: "vp09.00.10.08" }).catch(() => {});
}
if (typeof AudioDecoder === "function" && AudioDecoder.isConfigSupported) {
AudioDecoder.isConfigSupported({
codec: "mp4a.40.2", sampleRate: 44100, numberOfChannels: 2,
}).catch(() => {});
}
if (navigator.mediaDevices) {
navigator.mediaDevices.enumerateDevices().catch(() => {});
if (navigator.mediaDevices.getSupportedConstraints) {
navigator.mediaDevices.getSupportedConstraints();
}
}
// navigator.getAutoplayPolicy — browser/OS-dependent autoplay policy
if (typeof navigator.getAutoplayPolicy === "function") {
tryCall(() => navigator.getAutoplayPolicy("mediaelement"));
}
// onvoiceschanged setter hook
if (window.speechSynthesis) {
tryCall(() => { speechSynthesis.onvoiceschanged = null; });
}
// SpeechSynthesisUtterance .voice / .lang setter hooks
if (typeof SpeechSynthesisUtterance === "function") {
try {
const u = new SpeechSynthesisUtterance("");
u.lang = "en-US"; // setter hook
u.voice = null; // setter hook
} catch (_) {}
}
return [
"HTMLMediaElement.canPlayType (mp4/webm/audio)",
"MediaRecorder.isTypeSupported",
"VideoDecoder.isConfigSupported / AudioDecoder.isConfigSupported",
"mediaDevices.enumerateDevices / getSupportedConstraints",
"speechSynthesis.onvoiceschanged setter",
"SpeechSynthesisUtterance.voice / .lang setters",
];
},
extensionProbe() {
// Harmless: probe for a non-existent extension. Triggers our
// Image.src setter hook without actually loading anything.
const img = new Image();
img.onerror = () => {};
img.src = "chrome-extension://abcdefghijklmnopqrstuvwxyzaaaaaa/icon.png";
// Link tag probe
const link = document.createElement("link");
link.rel = "stylesheet";
link.href = "chrome-extension://abcdefghijklmnopqrstuvwxyzbbbbbb/style.css";
link.onerror = () => {};
document.head.appendChild(link);
setTimeout(() => { try { document.head.removeChild(link); } catch (_) {} }, 100);
// setAttribute path
const img2 = document.createElement("img");