# Safari Technology Preview 229 Release Notes Learn about the latest web technology updates in Safari Technology Preview: Accessibility, CSS, Events, Forms, JavaScript, Networking, SVG, Storage, Web API, Web Inspector, WebDriver, and WebGPU. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 229 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: [299669@main…300290@main](https://github.com/WebKit/WebKit/compare/14b99c0e40db17064a1e2cd77c40c3eae346e6e7...37447ea234d820dc738d4604c4956e475fe5c57a). ### Accessibility #### Resolved Issues - Fixed an issue where `` elements targeted by `aria-labelledby` lost their `LabelFor` relationships after content changes. ([300029@main](https://commits.webkit.org/300029@main)) (158906980) ### CSS #### New Features - Added support for `text-decoration-line` values `spelling-error` and `grammar-error`. ([299919@main](https://commits.webkit.org/299919@main)) (160494378) #### Resolved Issues - Fixed `offsetParent` to correctly return the fixed-position element’s containing block when it is not the viewport, such as a transformed element. ([300097@main](https://commits.webkit.org/300097@main)) (63739636) - Fixed propagation of the `body` element’s `writing-mode` to the document element to match the CSS Writing Modes Level 4 specification. ([300278@main](https://commits.webkit.org/300278@main)) (149475070) - Fixed `@position-try` so that `revert-layer` correctly only reverts the position-try origin instead of affecting other cascade origins. ([299900@main](https://commits.webkit.org/299900@main)) (154355428) - Fixed the calculation of `anchor()` positions in right-to-left or `vertical-rl` containers to correctly account for left-side scrollbars. ([300018@main](https://commits.webkit.org/300018@main)) (155852237) - Fixed baseline alignment for grid items by adding correct first baseline and last baseline row axis handling and properly accounting for baseline offsets. ([299933@main](https://commits.webkit.org/299933@main)). (155967278) - Fixed issues with `anchor()` positioning during overscroll by clamping scroll positions, preventing unnecessary scroll recaptures, and ensuring anchor resolution stays in sync with layout changes. ([300061@main](https://commits.webkit.org/300061@main)) (159356009) - Fixed an issue where anchor-positioned elements failed to update their position when the default anchor changed. ([300142@main](https://commits.webkit.org/300142@main)) (159899182) - Fixed an issue where collapsed table rows subtracted `border-spacing` twice. ([300023@main](https://commits.webkit.org/300023@main)) (160542118) - Fixed `::view-transition` pseudo-element to use `position: absolute` instead of `fixed` to align with the updated specification. ([300008@main](https://commits.webkit.org/300008@main)) (160622000) - Fixed container queries to allow `container-name` matching across the full flat tree, making container names tree-scoped in line with the CSS Conditional 5 specification. ([300033@main](https://commits.webkit.org/300033@main)) (160696378) - Fixed handling of `::first-letter` pseudo-elements to always force `inline` display unless floated.([300073@main](https://commits.webkit.org/300073@main)) (160710650) - Fixed the behavior of the nesting selector `&` directly inside `@scope` to correctly act like `:where(:scope)` for proper specificity handling. ([300153@main](https://commits.webkit.org/300153@main)) (160769736) ### Events #### Resolved Issues - Fixed boundary pointer and mouse events not firing when the hit test target changed under a stationary pointer. ([300277@main](https://commits.webkit.org/300277@main)) (160147423) - Fixed scroll event handling by consolidating `scroll` and `scrollend` into a single queue. ([300239@main](https://commits.webkit.org/300239@main)) (160936070) ### Forms #### Resolved Issues - Fixed input fields with `field-sizing: content` so that larger placeholder text now correctly expands the height of the field by including the placeholder’s computed height. ([299672@main](https://commits.webkit.org/299672@main)) (123125836) - Fixed painting for `` sliders in right-to-left vertical block writing modes. ([299690@main](https://commits.webkit.org/299690@main)) (158567821) ### JavaScript #### Resolved Issues - Fixed `TypeError` messages to be clearer in `for-of` loops. ([300154@main](https://commits.webkit.org/300154@main)) (159814766) ### Networking #### Resolved Issues - Fixed the frozen iOS user agent string to report version `18_7` for iOS 26.1. ([299818@main](https://commits.webkit.org/299818@main)) (159902747) ### SVG #### New Features - Added support for the `onbegin` event in the `SVGAnimationElement` IDL interface to align with the SVG animations specification. ([299724@main](https://commits.webkit.org/299724@main)) (130609424) - Added support for the `async` attribute in `SVGScriptElement` to align behavior with `HTMLScriptElement` and other browsers. ([299735@main](https://commits.webkit.org/299735@main)) (151561361) - Added support for the `hreflang` IDL attribute on `SVGAElement` to improve SVG link handling. ([299704@main](https://commits.webkit.org/299704@main)) (160133102) - Added support for `download` attribute on SVG `` element. ([299770@main](https://commits.webkit.org/299770@main)) (160222206) #### Resolved Issues - Fixed absolutely positioned SVG elements to correctly account for the containing block’s padding. ([300054@main](https://commits.webkit.org/300054@main)) (127608838) ### Storage #### Resolved Issues - Fixed an issue where dedicated workers could inherit storage access from their parent document, preventing them from sending cross-site requests with cookies. ([300120@main](https://commits.webkit.org/300120@main)) (158814068) ### Web API #### New Features - Added preview support for Event Timing API (Interaction to Next Paint) ([300205@main](https://commits.webkit.org/300205@main)) (160880698) #### Resolved Issues - Fixed `window.opener` being incorrectly set to `null` when a site-isolated iframe navigated to a new site, ensuring opener relationships persist across frame migrations. ([299924@main](https://commits.webkit.org/299924@main)) (117269418) - Fixed `scroll` and `scrollend` events so they correctly fire on `` elements instead of their inner elements. ([300260@main](https://commits.webkit.org/300260@main)) (157880733) - Fixed the order of `pointerup` and boundary events so that `pointerout` and `pointerover` fire before `pointerup` when a child element is attached under the cursor. (https://commits.webkit.org/300273@main) (160913756) - Fixed `element.scrollTo` and `element.scrollBy` so they correctly scroll text input fields by forwarding scroll operations to the inner text element. ([300274@main](https://commits.webkit.org/300274@main)) (160963921) #### Deprecations - Removed support for the non-standard “overflow” event. ([281672@main](https://commits.webkit.org/281672@main)) (71129110) ### Web Inspector #### Resolved Issues - Fixed an issue where the Console truncated long string outputs. ([300077@main](https://commits.webkit.org/300077@main)) (124629101) ### WebDriver #### New Features - Added support for new endpoints for setting storage access permission state and granting storage access to embedded frames for specific origins. (158263193) #### Resolved Issues - Fixed the `navigate` endpoint in WebDriver to properly validate URLs against the current browsing context and set the default readiness state to `Interactive` to align with the specification. ([299780@main](https://commits.webkit.org/299780@main)) (157031091) ### WebGPU #### New Features - Added support for using `GPUTexture` objects as depth-stencil and resolve attachments in WebGPU render passes to match the specification. ([299708@main](https://commits.webkit.org/299708@main)) (159952306) --- 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)