Event handlers for CSS animations can run while the debugger is paused, breaking run-to-completion. I'm not sure what to do here. Just not running the event handlers like we do for other events doesn't seem good, because these handlers are tied to the animation's behavior, and the animation continues playing while the debugger is paused. It's pretty weird that the animations are running at all while we're paused, so the best solution is probably to fix that, though I don't know how hard this will be.
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