Safari Technology Preview 252 brings @supports named-feature(), unprefixed user-select

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Apple released Safari Technology Preview 252 on September 11, 2026, authored by Jon Davis, incorporating WebKit changes across a defined commit range. The update introduces @supports named-feature(), enabling developers to test browser behaviours that property/value probes or selector() checks could not previously detect. Two CSSOM properties, CSSConditionRule.supports and CSSMediaRule.matches, are now exposed, and the unprefixed user-select property gains support alongside percentage values for text-decoration-inset. Two accessible-name fixes address a display:contents element incorrectly inheriting sibling text and list marker text leaking into accessible names. The release is limited to the preview channel and carries no Baseline designation.

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