Release Notes for Safari Technology Preview 130

Safari Technology Preview Release 130 is now available for download for macOS Big Sur and betas of macOS Monterey. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS.

This release covers WebKit revisions 279831-280418.

Note: Tab Groups do not sync in this release. On macOS Big Sur, this release requires enabling GPU Process: Media option from Experimental Features under the Develop menu to address issues with streaming services.

Web Inspector

  • Elements
    • Fixed selecting a sibling node using navigation breadcrumbs (r280037)


  • Changed to use the correct block-size to resolve min-content (r280023)
  • Changed to pass the full target point when selecting a snap offset (r280171)
  • Changed images as grid items to use the overridingLogicalWidth when defined to compute the logical height (r280024, r280078)
  • Ignored the aspect-ratio of a replaced element if stretch alignments are applied to both axes (r280022)


  • Implemented Array.prototype.findLast and Array.prototype.findLastIndex behind a runtime flag (--useArrayFindLastMethod) (r279937)


  • Added support for MediaError.message (r279978)
  • Added webm/opus container support for Web Audio (r280416)
  • Fixed hanging when entering PiP from element fullscreen (r280358)
  • Fixed SourceBuffer.abort() doesn’t go back to state WAITING_FOR_SEGMENT properly (r279904)
  • Fixed video pausing after scrubbing with the Touch Bar (r280330)


  • Fixed document.referrer value missing a trailing slash (r280342)
  • Fixed FetchResponse.formData() to not reject the promise if the body is null and the MIME type is "application/x-www-form-urlencoded" (r280046, r279969)
  • Fixed getBoundingClientRect() to return the correct rectangle on elements inside a multi-column container (r280017)
  • Fixed HTMLImageElement.decoding to reflect the decoding content attribute, limited to only known values (r280047)
  • Fixed Sync XHR “load” event always having total/loaded=0 (r279967)
  • Implemented SubmitEvent interface (r279979)


  • Fixed IDBFactory.databases to return correct results (r280410)
  • Implemented IDBTransaction.commit() (r280053)
  • Implemented IDBTransaction.durability (r280415)