[Webkit-unassigned] [Bug 187942] New: REGRESSION(WebAnimations+CSS): Transition added on element creation flakily doesn't work

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187942

            Bug ID: 187942
           Summary: REGRESSION(WebAnimations+CSS): Transition added on
                    element creation flakily doesn't work
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: thorton at apple.com
                CC: dino at apple.com

Created attachment 345640

  --> https://bugs.webkit.org/attachment.cgi?id=345640&action=review

repro

Steps to Reproduce:

1. With "Web Animations and CSS Integration" turned on:
2. Drag the black box.

Expected: A growing animation.
Actual: Most of the time, the box does not appear until the animation would have completed.

If the animation does run correctly, refresh the page and try again.

With "Web Animations and CSS Integration" turned off, this problem never reproduces.

Reproduces in STP 61.

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