# Safari Technology Preview 185 Release Notes Learn about the latest web technology updates in Safari Technology Preview: Accessibility, CSS, HTML, Media, Rendering, Web API, Web Inspector, WebAuthn, and WebGPU. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 185 is now [available for download](https://developer.apple.com/safari/resources/) for macOS Sonoma and macOS Ventura. 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: [271111@main…271831@main](https://github.com/WebKit/WebKit/compare/3e109296984d430615fc4d881514ca9d7d0e7afa...5b14c827a3e38d548c4635dc387049eef09133e4). ### Accessibility #### Resolved Issues - Fixed: Removed the default ARIA-level heading for a heading role, matching removal from ARIA specifications. ([271497@main](https://commits.webkit.org/271497@main)) (119059172) ### CSS #### New Features - Added support for `align-content` on block containers. ([271818@main](https://commits.webkit.org/271818@main)) (114740670) - Added percentage values support for `letter-spacing` and `word-spacing`. ([271357@main](https://commits.webkit.org/271357@main)) (116562262) - Added support for scroll anchoring with `overflow-anchor`. ([271790@main](https://commits.webkit.org/271790@main)) (118365809) - Added support for `@scope`. ([271670@main](https://commits.webkit.org/271670@main)) (119261250) - Added support for `::grammar-error` and `::spelling-error` ([271684@main](https://commits.webkit.org/271684@main)) (119314048) #### Resolved Issues - Fixed CSS counters to update properly on style changes. ([271451@main](https://commits.webkit.org/271451@main)) (109416780) - Fixed: Updated Full Size Kana table to Unicode 15. ([271276@main](https://commits.webkit.org/271276@main)) (111508663) - Fixed missing user-agent stylesheet rules for MathML fractions. ([271337@main](https://commits.webkit.org/271337@main)) (116922348) - Fixed selection gaps to get painted with the expected `::selection` pseudo-element color. ([271129@main](https://commits.webkit.org/271129@main)) (117796745) - Fixed `::backdrop` to be allowed after `::slotted()`. ([271366@main](https://commits.webkit.org/271366@main)) (119015204) - Fixed: Removed support for special first track handling to align with the evolving Masonry standard. ([271757@main](https://commits.webkit.org/271757@main)) (119041053) ### HTML #### New Features - Added support for ``. ([271736@main](https://commits.webkit.org/271736@main)) (119378678) ### Media #### New Features - Added WebCodecs VP9 profile 2 support. ([271238@main](https://commits.webkit.org/271238@main)) (118879753) #### Resolved Issues - Fixed an HEVC decoder issue when translating annexb data. ([271728@main](https://commits.webkit.org/271728@main)) (116768196) - Fixed AV1-in-MP4 codec string not shown in Show Media Stats. ([271187@main](https://commits.webkit.org/271187@main)) (118850797) - Fixed `getDisplayMedia` `frameRate` always at 30 regardless of constraints. ([271233@main](https://commits.webkit.org/271233@main)) (118874132) - Fixed to not loop if current time or duration is zero. ([271256@main](https://commits.webkit.org/271256@main)) (118902468) - Fixed in-band captions wrapping unnecessarily. ([271415@main](https://commits.webkit.org/271415@main)) (119024855) ### Rendering #### Resolved Issues - Fixed: Removed the `` `text-decoration`color override quirk. ([271338@main](https://commits.webkit.org/271338@main)) (102920597) - Fixed shadow invalidation issue in `vertical-rl` mode. ([271416@main](https://commits.webkit.org/271416@main)) (111915460) - Fixed text in flex items not breaking under specific conditions. ([271122@main](https://commits.webkit.org/271122@main)) (118796634) ### Web API #### New Features - Added `Element.prototype.setHTMLUnsafe()`, `ShadowRoot.prototype.setHTMLUnsafe()`, and `Document.parseHTMLUnsafe()` methods. ([271423@main](https://commits.webkit.org/271423@main)) (115345128) #### Resolved Issues - Fixed updating `resizeBy` and `resizeTo` to use `int` rather than `float` to align with specifications. ([271194@main](https://commits.webkit.org/271194@main)) (118872048) - Fixed the CookieChangeEvent to not be exposed when the Cookie Store API is disabled. ([271243@main](https://commits.webkit.org/271243@main)) (118902989) - Fixed `` to use the page’s preferred rendering update interval. ([271431@main](https://commits.webkit.org/271431@main)) (118976548) - Fixed `Element.prototype.setAttributeNode()` to not treat attribute names case insensitively. ([271363@main](https://commits.webkit.org/271363@main)) (119013600) - Fixed WebGL OffscreenCanvas returning the previously created WebGL1 context when asking for WebGL2. ([271546@main](https://commits.webkit.org/271546@main)) (119028794) - Fixed to allow `:checked` and `:indeterminate` to match at the same time. ([271430@main](https://commits.webkit.org/271430@main)) (119075969) ### Web Inspector #### New Features - Expanded OffscreenCanvas support for `bitmaprenderer`, `webgl`, and `webgl2`. ([271300@main](https://commits.webkit.org/271300@main)) (109594232) - Added Grid overlay support for Masonry layout. ([271332@main](https://commits.webkit.org/271332@main)) (118833618) ### WebAuthn #### New Features - Added support for `getClientCapabilities()`. ([271584@main](https://commits.webkit.org/271584@main)) (119058559) ### WebGPU #### New Features - Enabled WebGPU to be testable via a feature flag. ([271725@main](https://commits.webkit.org/271725@main)) (119262908) --- 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)