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Safari Technology Preview 251 adds ident(), inherit(), corner-shape, and random() in custom properties
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Safari Technology Preview 251 ships for macOS Golden Gate and macOS Tahoe with new CSS support including ident(), inherit(), corner-shape, object-view-box, and random() in custom properties, alongside a long list of layout and container query bug fixes.
The release lands a cluster of CSS functions and properties that have been absent from WebKit, so engineers running the preview can now prototype against ident(), inherit(), corner-shape, and an expanded random(). A long tail of layout, container query, scroll snap, and highlight bug fixes arrives in the same build, which should reduce cross-browser workarounds in test suites. Coverage comes only from WebKit's own release notes feed, so there is no independent framing or cross-engine comparison in the available material.
Written by elseif from the cluster below · every claim links back to a sourceThe three things worth knowing
New CSS additions include ident(), inherit(), corner-shape, object-view-box, random() in custom properties, random-item(), property-scoped caching keywords for random(), and HighlightRegistry.highlightsFromPoint().
@supports gains an at-rule(...) form that tests at-rule support, and @container queries now accept a comma-separated list of conditions, plus white-space-trim is supported inside the white-space shorthand.
Bug fixes touch flex base-size clamping, subgrid overflow under max-width, nested @scope root selection, scroll snap ordering among equally aligned targets::highlight() inheritance, and font-relative unit resolution.
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