# Safari Technology Preview 226 Release Notes Learn about the latest web technology updates in Safari Technology Preview: CSS, Canvas, JavaScript, Media, Rendering, SVG, Storage, Web API, Web Extensions, and Web Inspector. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 226 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: [297661@main…298483@main](https://github.com/WebKit/WebKit/compare/3e35c4992690e64ed24f51e67ec1c54994188dcc...5334ea5bd715ee7bdacb7db5b7a8e25bf23bdd84). ### CSS #### New Features - Added support for `@scope(:host)`. ([297670@main](https://commits.webkit.org/297670@main)) (153443869) - Added support for CSS tree-counting functions. ([297768@main](https://commits.webkit.org/297768@main)) (155624960) - Added support for `cross-origin()` and `referrer-policy()` CSS URL modifiers. ([297969@main](https://commits.webkit.org/297969@main)) (155625162) #### Resolved Issues - Fixed an issue where `@namespace` rules that failed insertion could still affect the namespace node. ([297893@main](https://commits.webkit.org/297893@main)) (156651404) ### Canvas #### Deprecations - Removed non-standard legacy `drawImageFromRect`. ([297846@main](https://commits.webkit.org/297846@main)) (141681635) ### JavaScript #### New Features - Added support for `Math.sumPrecise`. ([297839@main](https://commits.webkit.org/297839@main)) (155642395) - Added WebIDL support for [Enumerated] extended attribute and related attributes. ([298172@main](https://commits.webkit.org/298172@main)) (156249490) #### Resolved Issues - Fixed `Intl.Local#language` to return `"und"` if the language subtag is `"und"`. ([297585@main](https://commits.webkit.org/297585@main)) (156248659) - Fixed `Intl` to support non-continental timezones to align with the specification. ([297749@main](https://commits.webkit.org/297749@main)) (156424446) - Fixed exception check errors by adding a missing exception check for `Array#flat`. ([298221@main](https://commits.webkit.org/298221@main)) (157525399) ### Media #### Resolved Issues - Fixed WebVTT `line-height` to be `normal` by default, not `1`. ([297860@main](https://commits.webkit.org/297860@main)) (156633220) ### Rendering #### Resolved Issues - Fixed the cross axis direction in flexbox to properly consider text directionality when the cross axis aligns with the inline axis to handle `direction` property and `flex-wrap: wrap-reverse` interactions. ([297876@main](https://commits.webkit.org/297876@main)) (156540996) #### Deprecations - Removed UA styles for `h1` in `article`, `aside`, `nav`, and `section`. ([297671@main](https://commits.webkit.org/297671@main)) (151455566) ### SVG #### Resolved Issues - Fixed handling semicolons at end of a `keySplines` value. ([297793@main](https://commits.webkit.org/297793@main)) (156511711) - Fixed unnecessary rounding of `viewportLocation` in `'foreignObject'` layout. ([297986@main](https://commits.webkit.org/297986@main)) (156740732) ### Storage #### Resolved Issues - Fixed `requestStorageAccess()` should always grant access when called from a same-site iframe. ([297818@main](https://commits.webkit.org/297818@main)) (156545395) - Fixed Storage Access API to not be usable in insecure contexts. ([298179@main](https://commits.webkit.org/298179@main)) (157337423) - Fixed `requestStorageAccess()` to reject with a `NotAllowedError`. ([298183@main](https://commits.webkit.org/298183@main)) (157446015) ### Web API #### New Features - Added support for `document.caretPositionFromPoint()`. ([298336@main](https://commits.webkit.org/298336@main)) (144101675) - Added preview support for the Navigation API. ([298483@main](https://commits.webkit.org/298483@main)) (145595760) #### Resolved Issues - Fixed the ability to delete a cookie through Cookie Store API that was set through `document.cookie`. ([298397@main](https://commits.webkit.org/298397@main)) (142339417) - Fixed `location.protocol` setter to be restricted to HTTP(S) schemes. ([298349@main](https://commits.webkit.org/298349@main)) (157607342) - Fixed `CookieStore` methods to strip tabs and spaces from the names and values passed in. ([298470@main](https://commits.webkit.org/298470@main)) (157907393) ### Web Extensions #### Resolved Issues - Fixed `sender.origin` parameter to match `window.location.origin`. ([297959@main](https://commits.webkit.org/297959@main)) (155884667) ### Web Inspector #### Resolved Issues - Fixed an issue that prevented scrolling of the Media details sidebar from the Elements tab. ([298396@main](https://commits.webkit.org/298396@main)) (157768497) --- 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)