[Webkit-unassigned] [Bug 206899] New: [Web Animations] `DeclarativeAnimation` for CSS Animation is not always destroyed when class that applies `animation-name` is removed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206899

            Bug ID: 206899
           Summary: [Web Animations] `DeclarativeAnimation` for CSS
                    Animation is not always destroyed when class that
                    applies `animation-name` is removed
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: drousso at apple.com
                CC: dino at apple.com

Created attachment 389045

  --> https://bugs.webkit.org/attachment.cgi?id=389045&action=review

[HTML] Reduction

Attached a reduction page.

I encountered this when trying to debug 'LayoutTests/inspector/animation/lifecycle-css-animation.html', as the test would time out since Web Inspector would never get notified that the web animation had been destroyed, and only noticed it after adding logging inside WebCore.

The issue doesn't always reproduce, but it happens fairly often.

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