Release Notes for Safari Technology Preview 152

Safari Technology Preview Release 152 is now available for download for macOS Monterey 12.3 or later and macOS Ventura beta. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS Monterey, or System Settings under General → Software Update on macOS Ventura.

This release includes WebKit changes between: 252999@main…253168@main

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)