[Webkit-unassigned] [Bug 238696] New: Glitching transition with opacity and transform where opacity duration greater than transform duration

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238696

            Bug ID: 238696
           Summary: Glitching transition with opacity and transform where
                    opacity duration greater than transform duration
           Product: WebKit
           Version: Safari 15
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: j.hermann at dievirtuellecouch.net
                CC: dino at apple.com, graouts at apple.com

The CSS opacity transition seems to occur a second time when used in combination with a transform transition where the transition-duration of opacity is greater than the duration of transform.

See minimal test case: https://codepen.io/jh-dvc/pen/YzYEZOz

Can be reproduced in Safari 15.4 on both iOS 15.4 and MacOS 12.3. Did not occur prior to that version as far as I can tell.

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