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Safari Technology Preview 225 Release Notes

Learn about the latest web technology updates in Safari Technology Preview: Accessibility, CSS, Canvas, HTML, JavaScript, Rendering, SVG, WebDriver, and WebRTC.

Overview

Safari Technology Preview Release 225 is now available for download for macOS Tahoe and macOS Sequoia. If you already have Safari Technology Preview installed, you can update it in System Settings under General → Software Update.

This release includes WebKit changes between: 297036@main…297660@main.

Accessibility

Resolved Issues

  • Fixed incorrect accessibility bounds of SVG roots, ensuring assistive technologies have access to the correct geometry. (297649@main) (153782363)

CSS

Resolved Issues

  • Fixed the default computed value for text-emphasis-style: filled|open to be filled|open circle not filled|open dot in horizontal typographic modes. (297616@main) (155911820)

HTML

New Features

  • Added support for auto-expanding <details> element. (297083@main) (155256522)

  • Added support for hidden=until-found. (297084@main) (155256718)

JavaScript

Resolved Issues

  • Fixed the order of function’s special properties returned by Object.keys and Object.entries. (297260@main) (155607661)

  • Fixed compatibility issues with the timezone option in the Intl.DateTimeFormat constructor. (297594@main) (156148700)

  • Fixed Intl.Local#language to return "und" if the language subtag is "und". (297585@main) (156248659)

Rendering

Resolved Issues

  • Fixed anchor-center to shift to fit in the original containing block. (297226@main) (153569520)

  • Fixed chained anchors to scroll with their anchor. (297286@main) (154355127)

  • Fixed anchor-positioned or fixed-positioned element getting clipped by the viewport. (297297@main) (154908754)

  • Fixed file upload to have a consistent baseline when the file selector is display: none. (297516@main) (155109925)

  • Fixed computing static position to correctly size and locate an inset modified containing block. (297403@main) (155650719)

  • Fixed alignment candidate to consider both first and last baseline item position. (297402@main) (155806707)

WebDriver

Resolved Issues

  • Fixed an issue where events could be dispatched to an incorrect frame due to a stale state. (297613@main) (155933183)

WebRTC

Deprecations

  • Removed the fec and rtx from WebRTC encoding parameters. (297107@main) (155046829)

See Also

2025