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Safari Technology Preview 101 Offers The Usual Bug Fixes and Performance Improvements

Safari Technology Preview 101 Offers The Usual Bug Fixes and Performance Improvements

Apple on Wednesday released Safari Technology Preview 101, 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.

Release 101

Web Inspector

  • Added a special breakpoint for controlling whether debugger statements pause in the Sources tab
  • Changed to encode binary web socket frames using base64
  • Fixed elements closing tag showing reversed in RTL mode
  • Fixed the bezier editor popover to be strictly LTR
  • Fixed dragging handles in the easing popover selecting sidebar text
  • Updated some cookie table column headers to not be localizable


  • Corrected TextTrack sorting with invalid BCP47 language
  • Fixed AirPlay sometimes stopping after 60 minutes of playback

Apple Pay

  • Redacted billing contact during payment method selection


  • Added support for BigInt literal as PropertyName

Web Animations

  • Fixed accelerated animations freezing on a render tree rebuild
  • Fixed an event loop cycle between an animation finishing and it being removed from GraphicsLayerCA
  • Fixed an issue where out-of-view transitions could trigger high memory use
  • Prevented playing an accelerated animation that was canceled before it was committed


  • Changed authenticatorGetAssertion to be sent without pinAuth if user verification is discouraged


  • Aligned getDisplayMedia() with standards specifications
  • Fixed not processing newly gathered ICE candidates if the document is suspended


  • Fixed CSS rules with the same selector from several large stylesheets getting applied in the wrong order


  • Fixed pages that trigger a redirect sometimes getting left blank


  • Disallowed setting base URL to a data or JavaScript URL
  • Fixed highlight text decorations to work with all decoration types and colors
  • Implemented OffscreenCanvas.copiedImage
  • Added standard gamepad mapping for GameControllerGamepads
  • Tightened up stylesheet loading
  • Fixed quantifiers after lookahead assertions to be syntax errors in Unicode patterns only
  • Fixed \0 identity escapes to be syntax errors in Unicode patterns only


  • Fixed iteration of cursors skipping records if deleted

Back-forward Cache

  • Updated to remember if legacy TLS was used in the back-forward cache

The update can be downloaded from the Safari Technology Preview website, or if the browser is already installed, it can be updated via the “Update” tab in the Mac App Store. Full release notes for the update are also available on the Safari Technology Preview website.

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.

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