# Safari Technology Preview 216 Release Notes Learn about the latest web technology updates in Safari Technology Preview: Accessibility, CSS, Forms, Media, Rendering, Service Workers, SVG, Text, URLs, Web Animations, Web API, and Web Inspector. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 216 is now [available for download](https://developer.apple.com/safari/resources/) for macOS Sequoia and macOS Sonoma. 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: [291468@main…292534@main](https://github.com/WebKit/WebKit/compare/4668b2c07695433e6dadd4de2ff2ba54549f1fcc...b12ed39572951123a4b5a99c471e0262e9481001) ### Accessibility #### Resolved Issues - Fixed presentational images with empty `alt` attributes to be ignored by assistive technology, even when additional labeling attributes are set. ([292105@main](https://commits.webkit.org/292105@main)) (146429365) ### CSS #### New Features - Added additional support for `text-wrap-style: pretty` to now adjust all lines in the text box to improve rag and hyphenation. ([291750@main](https://commits.webkit.org/291750@main)) (146142653) #### Resolved Issues - Fixed buttons to not have `align-items: flex-start` by default. ([291883@main](https://commits.webkit.org/291883@main)) (146615626) ### Forms #### Resolved Issues - Fixed form associated ElementInternals always reporting a `customError` when using `setValidity`. ([291878@main](https://commits.webkit.org/291878@main)) (115681066) ### Media #### Resolved Issues - Fixed stale audio buffer data after seeking when playing sound through an AudioContext. ([291763@main](https://commits.webkit.org/291763@main)) (146057507) ### Rendering #### Resolved Issues - Fixed integrating `position-area` and `self-alignment` properties for `align-self` and `justify-self` ([291606@main](https://commits.webkit.org/291606@main)) (145889235) - Fixed `will-change: view-transition-name` to create a stacking context and a backdrop root. ([291636@main](https://commits.webkit.org/291636@main)) (146281670) - Fixed `will-change: offset-path` to create a stacking context and a containing block. ([291635@main](https://commits.webkit.org/291635@main)) (146292698) ### Service Workers #### Resolved Issues - Fixed Service Worker downloads being prematurely interrupted. ([291712@main](https://commits.webkit.org/291712@main)) (143065672) - Fixed the ReadableStream cancel method not getting reliably called in Service Worker. ([291551@main](https://commits.webkit.org/291551@main)) (144297119) ### SVG #### Resolved Issues - Fixed SVG paint server fallback handling for a non-existent URL. ([291726@main](https://commits.webkit.org/291726@main)) (144493507) - Fixed respecting the CSS `image-rendering` property when drawing an SVG. ([292202@main](https://commits.webkit.org/292202@main)) (144507619) - Fixed handling `url(...) none` to match the [SVG Paint Server specification](https://svgwg.org/svg2-draft/painting.html#SpecifyingPaint). ([291770@main](https://commits.webkit.org/291770@main)) (146454258) - Fixed ancestor bounding box for “disabled” `` and ``. ([292411@main](https://commits.webkit.org/292411@main)) (147455573) ### Text #### Resolved Issues - Fixed `` and `` to use `font-weight: bolder` to match the Web Specification. ([291855@main](https://commits.webkit.org/291855@main)) (146458131) ### URLs #### Resolved Issues - Fixed percent-encoding `^` in non-opaque URL paths. ([291614@main](https://commits.webkit.org/291614@main)) (146233526) - Fixed ensuring that opaque URL paths always roundtrip. ([292146@main](https://commits.webkit.org/292146@main)) (146848690) - Fixed making URL host and hostname setters handle `@` correctly. ([292041@main](https://commits.webkit.org/292041@main)) (146886347) - Fixed Windows drive letter after file:/// when parsing URLs. ([292396@main](https://commits.webkit.org/292396@main)) (147381130) ### Web Animations #### New Features - Added support for the `Animation` property `overallProgress`. ([291764@main](https://commits.webkit.org/291764@main)) (146470359) ### Web API #### Resolved Issues - Fixed: URL’s protocol setter should forbid switching non-special to special schemes. ([292443@main](https://commits.webkit.org/292443@main)) (82549495) - Fixed the ProgressEvent members `loaded` and `total` to use the `double` type as per a recent specification change. ([292359@main](https://commits.webkit.org/292359@main)) (146356214) - Fixed URLPattern’s hostname and port canonicalization. ([292382@main](https://commits.webkit.org/292382@main)) (147109380) - Fixed Intrinsic Sizing of SVG embedded via `` to be invalidated on navigation. ([292267@main](https://commits.webkit.org/292267@main)) (147198632) #### Deprecations - Removed the `svgDocument` interface from HTMLFrameElement to align with other browsers. ([291498@main](https://commits.webkit.org/291498@main)) (133800070) ### Web Inspector #### Resolved Issues - Fixed to show a separate overview for each target in the Timelines tab. ([292169@main](https://commits.webkit.org/292169@main)) (146356054) --- 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)