Release Notes for Safari Technology Preview 159

Safari Technology Preview Release 159 is now available for download for macOS Monterey 12.3 or later and macOS Ventura. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS Monterey, or System Settings under General → Software Update on macOS Ventura.

This release includes WebKit changes between: 256139@main…256265@main

Note: Shared Tab Groups and syncing for Tab Groups, Website Settings, and Web Extensions are not enabled in this release.



  • Changed to allow variables with the same name as the class in its static block (256311@main)


  • Fixed floating boxes overlapping their margin boxes (256183@main)
  • Fixed rendering artifacts when presenting a fullscreen video (256251@main)