[Webkit-unassigned] [Bug 173434] Support for 120Hz requestAnimationFrame

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Apr 12 05:57:01 PDT 2024


--- Comment #45 from Jeffrey Blanz <jeff03blue at gmail.com> ---
To update this bug (again):

- 120hz animations are supported on macOS and iPadOS.

   - Above 120hz animations are not supported on macOS with an external monitor with over a 120hz refresh rate. Chrome/firefox browsers support unlimited refresh rate animations. (Although currently the highest refresh rate monitor has 500hz).

- 120hz animations are not supported on iOS.

- 90hz animations are supported on visonOS.


1. iOS needs to support 120hz animations.

2. macOS needs to support up to unlimited animations.

3. The feature flag “prefer page rending updates near 60fps” needs to be off by default for macOS, iOS, and iPadOS. It is already off by default for visionOS.

Also, if anyone knows of a PWA that can test screen hz/fps with vsync like testufo.com can, a comment would be appreciated. PWA are currently capped at 60hz animations because the feature flag “prefer page rending updates near 60fps” is on by default for iOS, iPadOS, and macOS. PWAs only run on system default flags.

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