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Apple Releases Safari Technology Preview 152 – Brings Bug Fixes and Performance Improvements

Apple Releases Safari Technology Preview 152 – Brings Bug Fixes and Performance Improvements

Apple has released Safari Technology Preview 152, 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.

‌The current ‌Safari Technology Preview‌ release is built on the Safari 16 update and it includes features coming in macOS Ventura. It adds support for Live Text in videos and images, new web technologies, web push Passkeys, improved Safari Web Extensions, and more.

The preview is available for both macOS Monterey and macOS Ventura. It is no longer available for macOS Big Sur.

Release 152

Note: Shared Tab Groups and syncing for Tab Groups, Website Settings, and Web Extensions are not enabled in this release.

Web Inspector

  • Fixed stack traces to not include injected script host hooks (253022@main)
  • Changed to sort headers alphabetically in the Network tab (253138@main)


  • Fixed logical viewport units in font-size (253087@main)
  • Fixed MediaQueryList.matches to reflect iframe’s resize for viewport-dependent media queries (253123@main)
  • Fixed the color CSS property value being ignored on <select> elements (253074@main)
  • Fixed using the correct box-sizing when calculating block size (253064@main)
  • Made system colors respect inherited color-scheme values (253041@main)
  • Updated Container Queries to allow logical operators on the top-level without parenthesis (253035@main)


  • Fixed display: contents elements being inserted in the wrong AX tree position when they have inline renderer siblings (253038@main)


  • Fixed empty generated content to not prevent margin collapsing (253079@main)
  • Fixed clearing inline elements with a block ::before following a floated element (253076@main)
  • Prevented background propagation on <html> with any containment (253031@main)


  • Added NoIndexing miss optimization (253120@main)
  • Aligned Date.UTC to the specification (253044@main)
  • Changed to no longer ensure length validity for TypedArray iteration (253153@main)
  • Enabled Atomics object unconditionally (253137@main)
  • Enabled and renamed Array#groupBy to Array#group and Array#groupByToMap to Array#groupToMap (253101@main)
  • Implemented Symbols as WeakMap keys (253135@main)


  • Implemented Compression Streams API (253093@main)
  • Adopted Upgrade-Insecure-Request in SharedWorker handling (253167@main)
  • Changed to use EXIF orientation when creating an ImageBitmap from Blob (253004@main)
  • Deprecated window.styleMedia and removed its matchMedium() method (253168@main)
  • Fixed innerHTML and outerHTML setters to use the correct default namespace (253039@main)
  • Fixed <html> element to not have a manifest IDL attribute (253053@main)
  • Fixed decoding empty formdata with fetch (253047@main)
  • Fixed cloning a textarea to not set the initial selection at the end of the text content (253070@main)
  • Fixed XML parser to invoke custom element reactions at correct timing (253122@main)
  • Fixed loads from a dedicated worker not getting intercepted by the service worker when the calling worker script was cached (253037@main)
  • Stopped killing service workers if they don’t respond to subresource loads in a timely fashion (253037@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.