chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/fixedpos-video-in-abspos-quirk-crash.html

<!-- Quirks mode needed -->
<title>CSS Flexbox: fixed positioned video in absolute positioned on quirks mode</title>
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-containers">
<link rel="help" href="https://drafts.csswg.org/css-sizing-3/#percentage-sizing">
<link rel="help" href="https://crbug.com/841276">
<meta name="assert" content="This test ensures that a video works with fixed position in absolute position on quirks mode.">
<div style="position:absolute;">
  <div>
    <!-- Video element may work with shadow DOM using flex for media controls.
         This is mostly useful for browsers that use flex inside of video.-->
    <video style="position:fixed;"></video>
  </div>
</div>