Tag

#feature-detection

Tagged “feature-detection”

2 articles

Safari Technology Preview 252 adds @supports named-feature(), unprefixed user-select and two accessible-name fixes

WebKit's 11 September preview adds a named-feature() function to @supports, exposes CSSConditionRule.supports and CSSMediaRule.matches on the CSSOM, ships the unprefixed user-select property, allows percentage values in text-decoration-inset, and cleans up two accessible-name bugs around display: contents and list markers.

Sep 12, 2026 · Yuki Tanaka CSS & layout

@supports named-feature() lets you branch on behavior, not syntax

Bramus walks through @supports named-feature(), a new CSS conditional that tests capabilities the classic property, value, selector and at-rule checks were never able to see — like an implementation change, or two already-shipped features starting to cooperate.

Sep 8, 2026 · Iris Calderón