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Apple Safari Technology Preview 55 Offers Bug Fixes and Feature Improvements

Apple Safari Technology Preview 55 Offers Bug Fixes and Feature Improvements

Apple today released Safari Technology Preview 55, a new version of their experimental preview web browser, which allows developers and other interested parties to test features that may debut in future release versions of Safari.

Safari Technology Preview Release Notes

Release 55


  • Added support for calc() in webkit-gradient and cross-fade
  • Changed :active pseudo class to deactivate when using pressure sensitive trackpad
  • Omitted the default value when serializing font-feature-settings
  • Updated HSL and HSLA parsing to match CSS Color 4


  • Enforced content-type for <script> tags
  • Fixed input.webkitEntries to work as expected when a folder contains accented chars
  • Setting event.returnValue to true is now a no-op


  • Fixed animated GIFs with finite looping to loop the expected number of times
  • Fixed the position of the caret in empty table cells


  • Added the accessibility events to the HTML attribute names so AOM works with DOM Level 1 events
  • Fixed a hang when triggering an alert from an AOM increment event


  • Fixed function.prototype.caller to not return generator bodies

Web Driver

  • Fixed simulated mouse interactions to not be done until the associated DOM events have been dispatched

Web Inspector

  • Fixed selecting and copying text from a Network tab popover


  • Added allSamplesInTrackEnqueued event


  • Fixed a WebRTC data channel issue for non-ASCII characters.


  • Changed to use CSP and content blockers for sync XHR

Bug Fixes

  • Fixed an issue that would sometimes incorrectly rule out PDF as a mime type that can be showed
  • Fixed an issue with Command-clicking web app links on icloud.com

Users can either download the update from the Safari Technology Preview website, or if they already have the browser installed, they can download it via the Mac App Store. Full release notes for the update are available on the same 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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