Contents

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 Release 226 is now available for download 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.

CSS

New Features

  • Added support for @scope(:host). (297670@main) (153443869)

  • Added support for CSS tree-counting functions. (297768@main) (155624960)

  • Added support for cross-origin() and referrer-policy() CSS URL modifiers. (297969@main) (155625162)

Resolved Issues

  • Fixed an issue where @namespace rules that failed insertion could still affect the namespace node. (297893@main) (156651404)

Canvas

Deprecations

  • Removed non-standard legacy drawImageFromRect. (297846@main) (141681635)

JavaScript

New Features

  • Added support for Math.sumPrecise. (297839@main) (155642395)

  • Added WebIDL support for [Enumerated] extended attribute and related attributes. (298172@main) (156249490)

Resolved Issues

  • Fixed Intl.Local#language to return "und" if the language subtag is "und". (297585@main) (156248659)

  • Fixed Intl to support non-continental timezones to align with the specification. (297749@main) (156424446)

  • Fixed exception check errors by adding a missing exception check for Array#flat. (298221@main) (157525399)

Media

Resolved Issues

  • Fixed WebVTT line-height to be normal by default, not 1. (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) (156540996)

Deprecations

  • Removed UA styles for h1 in article, aside, nav, and section. (297671@main) (151455566)

SVG

Resolved Issues

  • Fixed handling semicolons at end of a keySplines value. (297793@main) (156511711)

  • Fixed unnecessary rounding of viewportLocation in 'foreignObject' layout. (297986@main) (156740732)

Storage

Resolved Issues

  • Fixed requestStorageAccess() should always grant access when called from a same-site iframe. (297818@main) (156545395)

  • Fixed Storage Access API to not be usable in insecure contexts. (298179@main) (157337423)

  • Fixed requestStorageAccess() to reject with a NotAllowedError. (298183@main) (157446015)

Web API

New Features

  • Added support for document.caretPositionFromPoint(). (298336@main) (144101675)

  • Added preview support for the Navigation API. (298483@main) (145595760)

Resolved Issues

  • Fixed the ability to delete a cookie through Cookie Store API that was set through document.cookie. (298397@main) (142339417)

  • Fixed location.protocol setter to be restricted to HTTP(S) schemes. (298349@main) (157607342)

  • Fixed CookieStore methods to strip tabs and spaces from the names and values passed in. (298470@main) (157907393)

Web Extensions

Resolved Issues

  • Fixed sender.origin parameter to match window.location.origin. (297959@main) (155884667)

Web Inspector

Resolved Issues

  • Fixed an issue that prevented scrolling of the Media details sidebar from the Elements tab. (298396@main) (157768497)

See Also

2025