File: effect-on-marquee-parent-crash.html

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<!DOCTYPE html>
<title>Animating marquee's parent inside display:none</title>
<link rel="help" href="https://drafts.csswg.org/web-animations-1/">
<link rel="help" href="https://crbug.com/1290016">
<div id=container></div>
<script>
  let outer = document.createElement('div');
  outer.style.display = 'none';
  let inner = document.createElement('div');
  let marquee = document.createElement('marquee');

  let effect = new KeyframeEffect(inner, [{'width': '1px'}], 1);
  let anim = new Animation(effect, null);
  anim.pause();

  document.body.append(outer);
  outer.append(inner);
  inner.append(marquee);

  // Don't crash.
</script>