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Test Info:
<!doctype html>
<html>
<head>
<script>
function start () {
const keyframe = new KeyframeEffect(undefined, {});
const animation = new Animation(keyframe, undefined);
// Make animation run backwards...
animation.playbackRate = -100;
// But then set the current time to the future so it becomes "current"...
animation.currentTime = 2055;
// After updating the playback rate to zero, however, it should no longer
// be "current" (and this takes effect immediately because |animation| is
// paused)...
animation.updatePlaybackRate(0);
// Now update the target and hope nothing goes wrong...
keyframe.target = div;
}
document.addEventListener('DOMContentLoaded', start)
</script>
</head>
<div id=div></div>
</html>