# Safari Technology Preview 186 Release Notes Learn about the latest web technology updates in Safari Technology Preview: CSS, Forms, HTML, JavaScript, Rendering, Service Workers, Web Animations, and Web API. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 186 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: [271832@main…272448@main](https://github.com/WebKit/WebKit/compare/7b65ded5da4652028c62f0958983f84d38e753f8...dcca261c751d3a4af2154720f3f6cb43f9c47ac1). ### CSS #### New Features - Added support for invalidating `:any-link`, `:link`, and `:-webkit-any-link` inside `:has()` ([271919@main](https://commits.webkit.org/271919@main)) (116616425) - Added support for `@scope` invalidation. ([271897@main](https://commits.webkit.org/271897@main)) (119313058) - Added support for an implicit scoping root when there is no ``. ([272390@main](https://commits.webkit.org/272390@main)) (119659940) - Added support for `:scope` inside `@scope` prelude. ([272065@main](https://commits.webkit.org/272065@main)) (119661541) - Added support for `align-content` on table cells. ([272373@main](https://commits.webkit.org/272373@main)) (119701629) - Added support for `content-visibility` to be animate-able. ([272364@main](https://commits.webkit.org/272364@main)) (119940258) #### Resolved Issues - Fixed `querySelector()` to not throw an exception for `-webkit-` prefixed pseudo-elements. ([272337@main](https://commits.webkit.org/272337@main)) (99299129) - Fixed `:user-invalid` triggering while typing a date. ([272346@main](https://commits.webkit.org/272346@main)) (110687369) - Fixed nested `@supports` queries with declarations. ([271989@main](https://commits.webkit.org/271989@main)) (113652033) - Fixed `contain: inline-size` breaking `grid-template-rows: auto`. ([272085@main](https://commits.webkit.org/272085@main)) (113915953) - Fixed parsing and serialization of `-webkit-` prefixed pseudo-elements. ([272411@main](https://commits.webkit.org/272411@main)) (118081134) - Fixed incorrect scoping roots with nested `@scope`. ([271941@main](https://commits.webkit.org/271941@main)) (119511916) - Fixed `@scope` prelude to take nesting into account. ([272117@main](https://commits.webkit.org/272117@main)) (119711922) - Fixed grid with size containment and `min-height` not sizing row correctly. ([272276@main](https://commits.webkit.org/272276@main)) (119736473) - Fixed `@scope` to be able to have orphaned declarations with an implicit enclosing style rule. (119937025) ### Forms #### New Features - Added focus ring support for ``. ([271884@main](https://commits.webkit.org/271884@main)) (119499785) - Added vertical rendering support for ``. ([272405@main](https://commits.webkit.org/272405@main)) (119940157) ### HTML #### Resolved Issues - Fixed missing support for the `direction` attribute in the list of attributes whose values are matched case-insensitively with attribute selectors. ([272219@main](https://commits.webkit.org/272219@main)) (119432066) ### JavaScript #### Resolved Issues - Fixed async functions and generators to properly handle promises with throwing “constructor” getter. ([272291@main](https://commits.webkit.org/272291@main)) (119734587) ### Rendering #### Resolved Issues - Fixed rendering for a `
` within a transformed parent `
` with `overflow: hidden`. ([271894@main](https://commits.webkit.org/271894@main)) (118901069) - Fixed `offsetHeight` and `offsetWidth` are 0 for an inline box wrapping a block. ([272386@main](https://commits.webkit.org/272386@main)) (119955792) ### Service Workers #### Resolved Issues - Fixed duplicate load requests with an active service worker. ([272024@main](https://commits.webkit.org/272024@main)) (104377727) ### Web Animations #### Resolved Issues - Fixed percentage transform animations when `width` and `height` are animated. ([272022@main](https://commits.webkit.org/272022@main)) (63309680) - Fixed a paused animation where `currentTime` is changed to 0 not restarting when unpaused. ([271872@main](https://commits.webkit.org/271872@main)) (118826588) ### Web API #### New Features - Added a “gamepad” permission policy defaulting to `*` for the allow list. ([272199@main](https://commits.webkit.org/272199@main)) (83219098) - Added ShadowRoot `clonable` attribute. ([272096@main](https://commits.webkit.org/272096@main)) (119707278) #### Resolved Issues - Fixed invalid coordinates on `wheel` and `gesturechange` events inside an iframe. ([272176@main](https://commits.webkit.org/272176@main)) (105243167) (FB11986074) - Fixed HTMLAreaElement to align with the HTML Standard. ([272217@main](https://commits.webkit.org/272217@main)) (110028213) - Fixed Scroll To Text Fragment to not scroll after dynamic stylesheet loads and the user has scrolled. ([272151@main](https://commits.webkit.org/272151@main)) (112608578) - Fixed toggling the `spellcheck` attribute not toggling spelling markers on input elements. ([271927@main](https://commits.webkit.org/271927@main)) (119269616) --- 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)