Can I Use

Can I Use is the de facto standard for browser compatibility lookup: type in any HTML/CSS/JS feature and get a support table across browsers and versions, weighted with global usage shares. Check it before adopting a new CSS feature and you avoid the rework of shipping something that breaks for some users.

1. Search by feature keyword (aspect-ratio, backdrop-filter).
2. Read the green/yellow/red table to decide whether you can ship it.
3. Watch the global support percentage above the table and the footnotes — partially supported features list their conditions in the notes.
4. Pair it with MDN's compatibility tables: Can I Use wins on lookup speed and its visual timeline.

• Covers nearly every HTML/CSS/JS/SVG feature
• Support tables precise to browser versions, with global usage shares
• A timeline view shows how support rolled out historically
• Free with no login — its data is cited across dev tools and documentation