# 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](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 225 is now [available for download](https://developer.apple.com/safari/resources/) 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](https://github.com/WebKit/WebKit/compare/3fbec4363b8205c7cdbbb209ab6a241e8db3e0bb...c49699cb9e15cd4c59e215d1faf2c926e0569560). ### Accessibility #### Resolved Issues - Fixed incorrect accessibility bounds of SVG roots, ensuring assistive technologies have access to the correct geometry. ([297649@main](https://commits.webkit.org/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](https://commits.webkit.org/297616@main)) (155911820) ### HTML #### New Features - Added support for auto-expanding `

` element. ([297083@main](https://commits.webkit.org/297083@main)) (155256522) - Added support for `hidden=until-found`. ([297084@main](https://commits.webkit.org/297084@main)) (155256718) ### JavaScript #### Resolved Issues - Fixed the order of function’s special properties returned by `Object.keys` and `Object.entries`. ([297260@main](https://commits.webkit.org/297260@main)) (155607661) - Fixed compatibility issues with the `timezone` option in the `Intl.DateTimeFormat` constructor. ([297594@main](https://commits.webkit.org/297594@main)) (156148700) - Fixed `Intl.Local#language` to return `"und"` if the language subtag is `"und"`. ([297585@main](https://commits.webkit.org/297585@main)) (156248659) ### Rendering #### Resolved Issues - Fixed `anchor-center` to shift to fit in the original containing block. ([297226@main](https://commits.webkit.org/297226@main)) (153569520) - Fixed chained anchors to scroll with their anchor. ([297286@main](https://commits.webkit.org/297286@main)) (154355127) - Fixed anchor-positioned or fixed-positioned element getting clipped by the viewport. ([297297@main](https://commits.webkit.org/297297@main)) (154908754) - Fixed file upload to have a consistent baseline when the file selector is `display: none`. ([297516@main](https://commits.webkit.org/297516@main)) (155109925) - Fixed computing static position to correctly size and locate an inset modified containing block. ([297403@main](https://commits.webkit.org/297403@main)) (155650719) - Fixed alignment candidate to consider both first and last baseline item position. ([297402@main](https://commits.webkit.org/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](https://commits.webkit.org/297613@main)) (155933183) ### WebRTC #### Deprecations - Removed the `fec` and `rtx` from WebRTC encoding parameters. ([297107@main](https://commits.webkit.org/297107@main)) (155046829) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)