[Webkit-unassigned] [Bug 229398] New: Incorrect KeyframesEffect generated for background

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Aug 23 02:31:17 PDT 2021


            Bug ID: 229398
           Summary: Incorrect KeyframesEffect generated for background
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattgperry at gmail.com
                CC: dino at apple.com, graouts at apple.com

Visit this sandbox in Safari: https://codesandbox.io/s/waapi-webkit-iteration-timing-bug-forked-8ozd3?file=/src/index.js

The middle box fails to animate `background`.

Logging the generated KeyframeEffect reveals the first keyframe contains `background: #ff2965` as expected. However, the final keyframe contains `backgroundImage: ""`

  - Removing `opacity` keyframes OR
  - Removing one `transform` keyframe

Will fix this, and all three boxes will animate `background` as expected.

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