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chromium/third_party/blink/web_tests/external/wpt/mathml/crashtests/mozilla/1435015.html 

<!doctype html>
<style>
  div { display: contents; }
</style>
<math></math>
<script>
  let div = document.createElementNS('http://www.w3.org/1998/Math/MathML', 'div');
  document.querySelector('math').appendChild(div);
</script>