[Webkit-unassigned] [Bug 272165] New: Prefer Page Rendering Updates Near 60fps Feature Flag doesn’t work on iPhone Pros

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Apr 4 10:26:44 PDT 2024


https://bugs.webkit.org/show_bug.cgi?id=272165

            Bug ID: 272165
           Summary: Prefer Page Rendering Updates Near 60fps Feature Flag
                    doesn’t work on iPhone Pros
           Product: WebKit
           Version: Safari 17
          Hardware: iPhone / iPad
                OS: iOS 17
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebKit API
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jeff03blue at gmail.com

On iPhones with a promotion display, so all iPhone 13 Pro or newer Pro devices, disabling the “Prefer Page Rending Updates near 60fps” feature flag does not work.

On iPad Pros and MacBook Pros with promotion display the feature flag works.

You can test this on https://www.testufo.com/

You will see that after disabling the feature flag. 120hz animations are not present on iPhone Pros, but they are on iPad Pros and MacBook Pros.

Also related: In PWA apps, 120fps is disabled regardless of the feature flag on iPad Pros and iPhone Pros. 120fps is enabled for MacBook Pro PWAs, but not iPhone Pros or iPad Pros.

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