Paste your HTML, JS, or CSS to check browser compatibility
| Feature | Chrome | Firefox | Safari | Edge | Support |
|---|
Paste any HTML, JavaScript, or CSS code and compat.cc scans it for browser-specific features. It detects 200+ features across four categories: JS APIs (fetch, IntersectionObserver, structuredClone), CSS properties (container queries, :has(), nesting), JS syntax (optional chaining, nullish coalescing, private fields), and HTML elements (dialog, details, loading=lazy).
Each detected feature is matched against caniuse data to determine the minimum browser version required. Results are sorted by most-limiting feature first, so you immediately see what's holding back your compatibility floor.
The scanner shows: minimum required version for Chrome, Firefox, Safari, and Edge; a global user coverage percentage based on real-world browser usage data; and a detailed breakdown of every detected feature with the exact code context where it was found.
Unlike caniuse.com where you search features one by one, compat.cc scans your actual code and tells you what matters. No signup, no server upload, no dependencies. The entire tool runs in your browser and weighs under 8KB.