gecko-dev/layout/generic/crashtests/1505817.html

<style>
  html {
    word-spacing: calc(-47em + 255px);
  }

  * {
    float: left;
    column-count: 14;
  }

  *::first-letter {
    -moz-margin-start: calc(25px*3);
  }
</style>
<script>
  function start() {
    o1 = document.createElement('c')
    audio = document.getElementById('audio_0')
    audio.insertAdjacentText('beforebegin', 'Ù\n-†­ð†3ê')
    audio.getClientRects()
    audio.insertAdjacentElement('beforebegin', o1)
    audio.getClientRects()
  }

  window.addEventListener('load', start)
</script>
<audio id="audio_0" muted>