File: content-visibility-selection-crash.html

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thunderbird 1%3A140.3.1esr-1
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<style>
* { content-visibility: auto; }
</style>
<script>
document.addEventListener('DOMContentLoaded', () => {
  document.documentElement.setAttribute('contenteditable', true)
  let a = document.createElement('map')
  let b = document.createElement('h1')
  let c = document.createElement('kbd')
  b.appendChild(c)
  a.appendChild(b)
  document.documentElement.appendChild(a)
  let d = new Range()
  let f = document.getSelection()
  f.addRange(d)
  d.setStart(c, 0)
  f.addRange(d)
  f.removeRange(d)
})
</script>