Created attachment 8761028 [details] A test case The red vertical line (which indicates currentTime I think) does not stop by calling pause(). I am not sure it worked before.
If you open the inspector after the page has loaded and the timeout has ended, then the red line (the scrubber) is paused. If you open the inspector first and then load the page, then the scrubber progresses through the whole animation, instead of pausing. If you open the inspector, select a non-animated element (like the <script> tag) in the inspector, reload the page, wait for the timeout, and then select the animated div, then the scrubber is paused. So it looks like the UI is just not getting an event telling it that the animation is paused.
Priority: -- → P2
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