Safari Technology Preview 249 adds CSS functions, Temporal, popover=hint in major update

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Apple released Safari Technology Preview 249 on July 29, 2026, covering WebKit changes for macOS Golden Gate and macOS Tahoe. The preview build introduces several CSS features including attr(), if(), @function custom functions, calc-mix(), and outline-offset: inset, among others. On the HTML and Web API side, popover=hint and the closedby attribute for dialog elements were added, continuing a trend of moving overlay behaviour into markup. JavaScript gains the Temporal object for improved date and time handling, while WebGPU adds subgroup support. As a preview build rather than a stable release, these features should be tested behind @supports checks and are not yet intended for production use.

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