[Webkit-unassigned] [Bug 204805] New: CSS animation skip frames if a sibling slot and/or assigned element is removed during animation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204805

            Bug ID: 204805
           Summary: CSS animation skip frames if a sibling slot and/or
                    assigned element is removed during animation
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: timdream at gmail.com
                CC: dino at apple.com

Created attachment 384730

  --> https://bugs.webkit.org/attachment.cgi?id=384730&action=review

slotted-element-animation.html

STR: See test case slotted-element-animation.html.

Expected result: I should see the same animation as the test case slotted-element-animation-no-sr.html

Actual: Frames are skipped for quite some time on the test case. The element no longer animates.

Note: Chrome and Firefox works fine.

Version: STP Release 96 (Safari 13.1, WebKit 14609.1.9.7) macOS 10.14.6 (18G1012)

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