testing/web-platform/tests/editing/crashtests/move-editing-host-to-subdocument-when-textarea-has-focus.html


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<script>
addEventListener("DOMContentLoaded", () => {
  document.querySelector("iframe").contentDocument.body.appendChild(
    document.querySelector("span")
  );
  document.documentElement.style.display = "none";
})
</script>
<hgroup>
<audio controls>
</audio>
<iframe></iframe>
<span contenteditable></span>
</hgroup>
<textarea autofocus>