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Safari Technology Preview 102 Offers The Usual Bug Fixes and Performance Improvements

Safari Technology Preview 102 Offers The Usual Bug Fixes and Performance Improvements

Apple on Thursday released Safari Technology Preview 102, 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 102

Web Inspector

  • Fixed VoiceOver to read the selected panel tab
  • Updated resource, type, and timeline icons for both light and dark modes


  • Changed the disk cache policy to allow resources larger than 10MB to be cached
  • Defered execution of async scripts until the document is loaded
  • Fixed value sanitization for input[type=text] to not truncate the value at a control character
  • Fixed new FontFace() to not throw when failing to parse arguments
  • Implemented EventTarget constructor
  • Set User-Agent in preconnect requests


  • Improved the speed of index cursor iteration when there are a lot of index records from different object stores
  • Changed to prefetch cursor records on client side

Apple Pay

  • Added support for Apple Pay buttons with custom corner radii

Web Animations

  • Ensured CSS Transition and CSS Animation events are queued, sorted and dispatched by their timeline
  • Ensured animations that lose their effect don’t schedule an animation update
  • Fixed repeated animations on pseudo elements failing to run after a while
  • Fixed style changes due to Web Animations to not trigger CSS Transitions


  • Improved performance of track sizing algorithm for spanning items


  • Changed to not fire timers when there is a pending rendering update
  • Fixed a white flash that can occur if JavaScript forces an early layout

Web Driver

  • Fixed Automation.setWindowFrameOfBrowsingContext to accept negative origin values

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.