🌐 Browser Feature Detector

What can Browser Feature Detector do?

The Browser Feature Detector tool scans your current browser environment to check support for hundreds of Web APIs, CSS features, and JavaScript capabilities. For frontend developers, this is the most reliable way to determine whether a technology can be used — more accurate than checking compatibility tables because it tests directly in your browser.

Core Features

• Web API Detection: Test support for Geolocation, WebRTC, Service Worker, WebGL, Web Audio, IndexedDB, Notification, Clipboard, and 100+ other Web APIs
• CSS Feature Detection: Test CSS Grid, Flexbox, Container Queries, Subgrid, CSS Layers, CSS Nesting, :has() selector, and other modern CSS features
• JavaScript Capability Detection: Test ES Modules, SharedArrayBuffer, Atomics, Optional Chaining, Nullish Coalescing, and other JS features
• Browser Information: Display User-Agent, screen resolution, device pixel ratio, color depth, online status, and other browser details
• Search & Filter: Filter features by category, search by keyword to quickly find specific features
• Export Results: One-click export of complete detection report as JSON file, or copy to clipboard for sharing

How to Use

1. Open the page — detection starts automatically, no manual action needed

2. View browser information at the top (User-Agent, resolution, etc.)

3. Use filter buttons to browse by category (Web API/CSS/JavaScript/Media/Security)

4. Type in the search box to quickly find specific features

5. Click "Export JSON" to save the full report, or "Copy Results" to share with colleagues

Use Cases

Case 1: Frontend Developer Compatibility Assessment

Before developing new features, use this tool to check if the target browser supports the required Web APIs and CSS features. Results are more accurate than Can I Use because they test directly in the current environment.

Case 2: QA Team Environment Verification

When reporting browser compatibility bugs, testers can export a feature detection report to help developers quickly identify whether the issue is unsupported features or code bugs.

Case 3: Technology Stack Selection

When choosing technologies (WebRTC, Service Worker, WebGL, etc.), use this tool to check browser support rates for your target user base, avoiding poorly compatible solutions.

Extended Knowledge

Feature Detection is a modern frontend development best practice, superior to browser sniffing (User-Agent detection). Feature detection directly tests whether the browser supports a feature, rather than relying on browser version numbers. This approach is more reliable because the same browser with different configurations may have different feature support. Popular feature detection libraries include Modernizr, but this tool requires no dependencies — it uses pure browser native APIs for detection.