WebKit Features in Safari 17.3

Last month, Safari 17.2 brought our biggest December release of web technology ever — with 39 new features and 169 bug fixes. Now, in January, Safari 17.3 brings bits of polish to that release.



  • Fixed nested @supports queries with declarations. (113652033)
  • Fixed the caret color on iOS following an explicitly-set CSS color attribute. (118401826)


  • Fixed cookies not always working as expected with Samesite=Lax. (119362503)
  • Fixed an issue causing sign in to fail on Delta.com. (120431796)


  • Fixed to not loop if current time or duration is zero. (118902468)
  • Fixed in-band captions wrapping unnecessarily. (119138261)


  • Fixed unauthenticated cross-site Fetch requests to not use the global HSTS cache. (119047103)

Web Animations

  • Fixed: Prevent scheduling for an effect targeting an element with display: none. (119191813)

Updating to Safari 17.3

Safari 17.3 is available for iOS 17, iPadOS 17, macOS Sonoma, macOS Ventura and macOS Monterey.

If you are running macOS Ventura or macOS Monterey, you can update Safari by itself by going to Software Update, and clicking “More info”. On macOS Ventura, that’s  > System Settings > General > Software Update > More info.

To get the latest version of Safari on your iPhone or iPad, go to Settings > General > Software Update, and tap to update.


We love hearing from you. To share your thoughts on Safari 17.3, find us on Mastodon at @jensimmons@front-end.social and @jondavis@mastodon.social. Or send a reply on X to @webkit. If you run into any issues, we welcome your feedback on Safari UI, or your WebKit bug report about web technologies or Web Inspector. Filing issues really does make a difference.

Download the latest Safari Technology Preview to stay at the forefront of the web platform and to use the latest Web Inspector features.

You can also find this information in the Safari 17.3 release notes.