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<script>
function onError() {
  // For emulating the traditional behavior, collapse Selection to end of the
  // text node in the <dl> which is the last deepest child of the <body>.
  const dl =  document.querySelector("dl");
  getSelection().collapse(dl.lastChild, dl.lastChild.length);
  getSelection().selectAllChildren(
    document.querySelector("img")
  );
  document.execCommand("insertUnorderedList");
  document.execCommand("enableObjectResizing");
}
</script>
<dd contenteditable="true">
<audio src="data:text/html,foo" onerror="onError()">
<img></img>
<dl>
</dl></audio><dd></body>