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Sep 24, 2026

Safari Technology Preview 253 lets container queries branch on sibling-index() and frees style-originated scroll timelines

WebKit's 23 September preview brings sibling-index() and sibling-count() into @container conditions, expands style-originated scroll timelines to match globally, exposes CSSContainerRule.conditions, corrects the ViewTimeline constructor to require a subject, and fixes a VoiceOver announcement bug around aria-keyshortcuts.

Sep 24, 20263 min read0 reactions0 comments
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Sep 7, 2026

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, 20264 min read0 reactions0 comments
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Sep 12, 2026

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, 20261 min read0 reactions2 comments