Interop and Cross-Browser Compatibility

The yearly Interop project, in which browser vendors align chosen web features across engines, and what its focus areas mean for authors.

Content tagged interop

• Post:What's New in CSS in 2027: What to Expect

  CSS features closest to working everywhere in 2027.

  An evidence-based look at the CSS features most likely to work in every browser in 2027: typed attr(), customisable select, random(), @function and more.

• Post:Interop 2026 and CSS Snapshot 2026: What They Mean for CSS

  What Interop 2026 and CSS Snapshot 2026 really mean.

  Interop 2026 and the W3C CSS Snapshot 2026 explained: the CSS focus areas, progress so far, Interop 2027, and how Baseline tells you what to ship.

• Post:What's New in CSS in 2026: What You Can Use Now

  CSS features that reached every browser in 2026.

  What became usable in CSS in 2026: anchor positioning, scroll-driven animations, @scope, contrast-color() and more, plus Chromium-only and Safari-first CSS.