• Home
  • macOS
  • News
  • Apple Releases Safari Technology Preview 170 – Brings Bug Fixes and Performance Improvements

Apple Releases Safari Technology Preview 170 – Brings Bug Fixes and Performance Improvements

Apple Releases Safari Technology Preview 170 – Brings Bug Fixes and Performance Improvements

Apple has released Safari Technology Preview 170, 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 Release 170 is now available for download for macOS Monterey 12.3 or later and macOS Ventura. If you already have Safari Technology Preview installed, you can update it 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: 263290@main…263537@main.


  • Fixed :dir pseudo-class to invalidate after removing dir content attribute from the document element (263357@main)
  • Fixed computing the percentage height of table cell replaced children where the table cell has a horizontal scrollbar (263318@main)
  • Fixed shorthand flow relative margin and padding values to resolve for individual CSS property values (263372@main263391@main)
  • Fixed trimming nested self-collapsing children at block-end (263439@main)
  • Fixed trimmed block-end margins for block containers to be reflected in the computed style in a horizontal writing mode (263398@main)
  • Fixed content at block-start edge to have their trimmed margins reflected in the computed style (263412@main)
  • Fixed the CSS hypot() function sometimes returning the result squared (263351@main)


  • Fixed the value not updating on <meter> and <progress> elements (263473@main)


  • Fixed unexpected content wrapping when percent padding is present (263535@main)
  • Fixed sibling flex items sometimes showing clamped content (263360@main)
  • Fixed incorrect damage line index sometimes causing double inline items (263455@main)
  • Fixed content getting truncated too early caused by subpixel flooring (263428@main)
  • Fixed text-overflow: ellipsis truncating the text incorrectly in right-to-left (263418@main)


  • Expanded existing property names caching onto Reflect.ownKeys() and Object.getOwnPropertySymbols() (263441@main)
  • Integrated inlined megamorphic access in DFG and FTL (263300@main)
  • Optimized Object.assign with empty object (263444@main)
  • Simplified and optimized the JSON parser (263416@main)


  • Fixed content briefly zooming in when exiting picture-in-picture (263350@main)
  • Fixed AirPlay sometimes failing (263534@main)


  • Fixed handling of popovers moved between documents after beforetoggle event (263449@main)
  • Implemented focus navigation scopes for popovers (263532@main)


  • Fixed aria-flowto for display: contents elements (263425@main)
  • Fixed display: contents elements never returning any selected AX children despite having them (263339@main)
  • Fixed the accessible name getting computed incorrectly for display: contents elements that rely on labels or captions (263379@main)
  • Fixed form controls to be focusable when tabindex attribute is set (263527@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.