Tag

#supports

Tagged “supports”

3 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 Browser releases

Safari Technology Preview 251 lands @supports at-rule(), random() with caching, corner-shape and object-view-box

WebKit's 26 August preview adds an at-rule test to @supports, property-scoped caching on random(), the random-item(), ident() and inherit() functions, the corner-shape and object-view-box properties, comma-separated @container conditions, white-space-trim in the white-space shorthand, and HighlightRegistry.highlightsFromPoint().

Sep 7, 2026 · Iris Calderón