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Safari Technology Preview 100 Offers The Usual Bug Fixes and Performance Improvements

Safari Technology Preview 100 Offers The Usual Bug Fixes and Performance Improvements

Apple on Wednesday released Safari Technology Preview 100, 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 100

Web Inspector

  • Added links to Web Inspector Reference documentation
  • Renamed the Canvas Tab to be the Graphics Tab, and included basic information and graphical representations of all Web Animation objects that exist in the inspected page
  • Allowed developers to evaluate arbitrary JavaScript in isolated worlds created by Safari App Extensions via the execution context picker in the Console

Web Animations

  • Added support for the options parameter to getAnimations()
  • Changed animations to run accelerated even if other animations targeting the same element are not accelerated
  • Fixed changing the delay of an accelerated animation to correctly seek
  • Fixed a leak of CSS Animations when removing its animation-name property
  • Separated setting a timeline’s current time from updating its animations
  • Updated all DocumentTimeline objects when updating animations


  • Fixed User Verification (UV) option present on a CTAP2 authenticatorMakeCredential while the authenticator has not advertised support for it


  • Added support for allow=”fullscreen” feature policy
  • Changed EME to only emit an array of persistent-usage-records when more than one record is discovered
  • Corrected VTT Cue Style handling to match the specification
  • Fixed decoder glitches when watching videos on CNN.com
  • Fixed AirPlay placard not visible when AirPlay is entered in fullscreen mode
  • Fixed video sound sometimes continuing to play in page cache
  • Fixed HTMLMediaElement to not remove the media session at DOM suspension time


  • Added finite timeout when synchronously terminating a service worker
  • Fixed :matches() to correctly combine with pseudo elements
  • Fixed automatic link replacement via “Smart links” to emit insertLink input events
  • Disabled Service Workers before terminating an unresponsive service worker process
  • Implemented “create a potential-CORS request”
  • Implemented transferable property of OffscreenCanvas
  • Improved performance speed of index records deletion in IndexedDB
  • Made pasteboard markup sanitization more robust
  • Used Visible Position to calculate Positions for highlights


  • Fixed EXIF orientation ignored for some CSS images
  • Fixed elements no longer stay fixed with elastic overscroll


  • Added support for MediaRecorder.requestData


  • Fixed DateMath to accept more ISO-8601 timezone designators even if they are not included in ECMA262 to produce expected results in the wild code


  • Implemented sub-source texImage2D and texSubImage2D

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.