New to the web platform in March  |  Blog  |  web.dev

New to the web platform in March

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Discover some of the interesting features that have landed in stable and beta
web browsers during March 2025.

Published: March 31, 2025

Stable browser releases

In March 2025 Firefox 136,
Chrome 134, and
Safari 18.4 became stable.
This post looks at the new features added to the web platform.

New pseudo-classes :has-slotted and :open

Firefox 136 supports the :has-slotted pseudo-class, used to style elements in