Discover some of the interesting features that have landed in stable and beta web browsers during May 2026.

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A roundup of new web platform features landing in stable and beta browsers during May 2026. Chrome 148, Firefox 151, and Safari 26.5 shipped notable additions including: the :open CSS pseudo-class reaching Baseline (now supported across all major browsers), name-only container queries becoming Baseline, container style queries for custom properties reaching full cross-browser support, native lazy loading for video and audio elements in Chrome 148, the Document Picture-in-Picture API in Firefox 151, and expanded Web Serial API support. Beta releases Chrome 149 and Firefox 152 preview upcoming features like CSS gap decorations, Promise-returning scroll methods, BFCache support for WebSocket pages, and the field-sizing property.

New to the web platform in May

<p>Reading about all those nice and new CSS features makes me realise how little I know about CSS in general and about modern CSS in particular</p>
