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Apple Releases Safari Technology Preview 180 – Brings Bug Fixes and Performance Improvements

Apple Releases Safari Technology Preview 180 – Brings Bug Fixes and Performance Improvements

Apple has released Safari Technology Preview 180, the latest version of their developer preview web browser. The preview version of Apple’s popular browser offers developers and other interested users the ability to try out features that may or may not, debut in future public release versions of Safari.

‌Safari Technology Preview‌ 180 includes fixes and updates for Accessibility, CSS, JavaScript, Loading, Media, Web Animations, and Web API.


Safari Technology Preview Release 180 is now available for download 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: 267603@main…268059@main.


Resolved Issues

  • Fixed parsing the ARIA role attribute to ignore leading and trailing whitespace, including line breaks. (267930@main)
  • Fixed exposing column headers of cells within role="row" elements with display: contents to assistive technologies. (267838@main)
  • Fixed empty accessibility label for role="treeitem" elements with display: contents who have child text starting with a newline. (267839@main)
  • Fixed form landmarks being incorrectly exposed when they are missing a label. (268025@main)


New Features

  • Added support for rect() shape for shape-outsideclip-path, and offset-path. (267863@main)

Resolved Issues

  • Fixed the default link color contrast for the dark color scheme. (267847@main)
  • Fixed :has(:scope) matching. (267856@main)
  • Fixed invalidating scope-breaking :has(:is(...)) selectors. (268038@main)
  • Fixed backface-visibility to create a stacking context and containing block. (267980@main)
  • Fixed basic shapes to use an offset motion path. (267866@main)
  • Fixed grid to not always put first and last baseline aligned items into different alignment contexts. (267922@main)
  • Fixed :has(~ :is(.x ~ .y)) to consider all siblings of the :has scope when invalidating. (267932@main)
  • Fixed invalidating :default pseudo-class changes on input elements. (267848@main)
  • Fixed calc(clamp(1px, 1em, 1vh)) to collapse to clamp(1px, 1em, 1vh). (267840@main)
  • Fixed determing baseline for grid by considering the first and last baseline-aligned grid items. (268029@main)
  • Fixed the serialization of the computed style of grid-area. (268026@main)


  • Removed support for the auto value from alignment-baseline. (268008@main)


New Features

  • Added support for CanDeclareGlobalFunction abstract operation and related implementations. (267655@main)
  • Added support for HasVarDeclaration abstract operation. (267891@main)


Resolved Issues

  • Fixed an issue with a workaround to handle cases where websites serve Data URLs with malformed padding. This issue prevented some images in Word documents from failing to display when hosted by Box and Sharepoint. (267987@main)

Mediain page

Resolved Issues

  • Fixed WebCodecs hardware encoders losing a frame. (267865@main)

Web Animations

Resolved Issues

  • Fixed color-scheme to support discrete animation. (267750@main)


Resolved Issues

  • Fixed URL encoding for Request’s referrer feature and Response.redirect(). They now always use UTF-8. (267841@main)

While the preview is intended for use by developers and advanced users, in order to provide Apple with feedback on the development of the Safari browser, it can be run side-by-side with the release version of Safari. The app doesn’t require a developer account to download and install. For more information, visit the Safari Technology Preview website.