[Webkit-unassigned] [Bug 170841] New: animation-play-state: paused does not work when animation includes transform3d

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=170841

            Bug ID: 170841
           Summary: animation-play-state: paused does not work when
                    animation includes transform3d
           Product: WebKit
           Version: Safari 10
          Hardware: iPhone / iPad
                OS: iOS 10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kimatg at gmail.com
                CC: dino at apple.com

In iOS 10.3.1 Safari, animation-play-state: paused does not work when animation includes a transform3d. 
While searching I came across a report posted on Apple Communities: https://discussions.apple.com/thread/6762081?start=0&tstart=0

The OP has posted 2 jsfiddle links for tests which I think demonstrate this issue clearly, so I will post the links here directly.

Example with normal transform (2d): http://jsfiddle.net/gdementis/p2MgM/3/
Example with transform3d: http://jsfiddle.net/gdementis/HykgE/2/

When tested on desktop Safari 10.1 (12603.1.30.0.34), both examples work properly when clicking on Stop to pause the animation.
When tested on iPhone Safari, the Stop button on the 2nd jsfiddle does not stop the animation.

I discovered this bug when working on my own project where I had used animation-play-state: paused on an element that runs a repeating animation that has scale() transform, and the pause did not work as expected only on iPhone.

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