Miscellaneous

1. What are Miscellaneous Features in Browser Fingerprinting

Among the many fingerprint vectors, Miscellaneous Browser Features represent a group of capability-based indicators used to determine which APIs, attributes, and custom language wrappers are supported by the browser or the underlying environment.

These features are not always tied to hardware, but are influenced heavily by:

Browser implementation support
Engine version (e.g., Blink, WebKit)
Device operating policies
Runtime modifications (e.g., third-party browser automation tools or fingerprint engines)

They are often used by platforms to:

Detect if you’re mimicking a standard browser
Identify automation fingerprints or spoofed environments
Calculate feature consistency score
Exclude profiles using “disallowed” tech combos such as VMs with real users’ capabilities

This fingerprint layer plays a pivotal role in device authenticity scoring, helping services distinguish real users from emulated or automated ones.

2. How Platforms Use Miscellaneous Features for Fingerprinting

Advanced platforms build a feature compatibility profile to estimate whether your browser is:

A real browser (and not a remote or spoofed environment)
An outdated or suspected insecure environment
Missing specific capabilities or overpowered due to testing tools (e.g., Puppeteer)

Some of the tests used in real-world detection logic include:

✅ Positively Expected Features

Feature Test	Relevance in Normal Browsers
`navigator.geolocation`	Common on modern desktop and mobile browsers
`AudioContext`	Built-in for HTML5 multimedia
`requestAnimationFrame`	Essential for animations and browser-side rendering
`Web Cryptography API`	Required for secure websites using client certificates
`TextEncoder/Decoder`	Standard in all modern browsers (except very old versions)
`Promise` and `Proxy` support	Indicates up-to-date JS environment
`Notifications API`	Used in permission-based platforms like shops, finance portals

❌ Less Common or Security-Related Features

Feature Test	Suggests Automation/Modified Browsers
`Low Battery Level` = true	Rare unless used for demos or notebooks
`DOM style[scoped]` = true	Deprecated, implies a special environment
`canvas.captureStream`	Often modified or missing
`Web Intents` = false	Obsolete on most modern browsers
`AmbientLightEvents` = false	Usually unsupported unless in sensor-based UX apps
`Force Touch Events` = false	Only certain macOS devices support this now
`DeviceMotionEvent`/`Orientation`	Often missing on non-mobile environments
`Web Authentication API`	False means outdated or automated client

Violations in expected feature sets — for example, a browser from 2025 claiming no Promise support or a desktop browser failing Battery API tests — can degrade trust scores and alert systems on multi-accounting probabilities.

3. How FlashID Emulates Natural Feature Detection

FlashID ensures that each browser profile accurately inherits and presents software-level compatibility that aligns with the user’s chosen fingerprint identity. This includes:

3.1. Uniform Feature Reporting

Enabled or Disabled based on profile browser version/OS
Ensures consistent returns of ✔true or ×false across all test session loads

3.2. Embedded Feature Whitelist Matching

Each profile auto-matches a table of expected features based on:

Browser engine build (e.g., Chrome 128.x on macOS 14.x or Win10)
OS capabilities (Windows lacks DeviceMotionEvent, mobile includes it if enabled)
Environment variant (Headless vs. Real Desktop)

3.3. Simulated Support & Failures

FlashID employs real-like feature behavior, including:

navigator.userAgentData.features masks according to supplier
Synthetic responses for outdated and deprecated features (e.g., ×false on VML or Web Intents)
Optional delay on battery or ambient light test responses to mimic real-world execution rate
Fake Permission API error returns for features like Promise, Blob, or CustomEvent if needed

This partial features control ensures tighter** anti-detection**, allowing users to choose their environment closer to real browser variants, without appearing over-configured or actively manipulated.

✅ Example Supported Features Table (Potential Screenshot or Appendix - Not rendered here in markdown)

Feature Description	Test Result
Geolocation API	✔true
Canvas Capture Stream API	✔true
Battery API	✔true
Low Battery Level	×false
Blob Constructor	✔true
Context menus	×false
Force Touch Events	×false
iframe[seamless] Attribute	×false
DOM style[scoped]	×false
Web Intents	×false
Ambient Light Events	×false
VML	×false
Dart Support	×false