Can I Use
caniuse.com
A compatibility table showing browser support for HTML, CSS, JavaScript, and SVG features across all major browsers and versions.
Why it is useful
The first place to check before using any browser API or CSS feature in production — the table instantly shows which browsers and versions support it, with notes on known bugs and partial implementations. The usage statistics help make informed decisions about polyfills and progressive enhancement. Bookmarked by every front-end developer.