[Webkit-unassigned] [Bug 240752] New: REGRESSION: Hardware accelerated animations using steps() no longer works

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240752

            Bug ID: 240752
           Summary: REGRESSION: Hardware accelerated animations using
                    steps() no longer works
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gammon at adobe.com
                CC: dino at apple.com, graouts at apple.com

Created attachment 459634

  --> https://bugs.webkit.org/attachment.cgi?id=459634&action=review

Transform Animation with step() which chokes when main thread busy

Using steps() in a css animation with transforms suffers performance issues when the main thread is occupied. This doesn't seem to occur in any other major browser.

In the attached example clicking the button will occupy the main thread for 2 seconds. The animation pauses in webkit. It should instead continue animating as though the button was not clicked.

Found previous example of this issue marked fixed:
#186129

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