[Webkit-unassigned] [Bug 188655] New: REGRESSION (r233268): transform animation of a <picture> element with an implicit from fails

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=188655

            Bug ID: 188655
           Summary: REGRESSION (r233268): transform animation of a
                    <picture> element with an implicit from fails
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: graouts at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 347266

  --> https://bugs.webkit.org/attachment.cgi?id=347266&action=review

Test

The attached test case regressed with https://trac.webkit.org/changeset/233268 which was a fix for https://bugs.webkit.org/show_bug.cgi?id=186909. The issue goes away under several scenarios:

- use an <img> directly instead of a <picture>
- change .grid to not have explicit left and transform values and change slide-in to animate to translateX(100%)
- add an explicit 0% { transform: translateX(-100%) } keframe for the slide-in animation

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