<!DOCTYPE html>
<style>
  html {
    display: table;
  }
</style>
<script>
  if (window.testRunner)
    window.testRunner.dumpAsText();
  onload = () => {
    document.designMode = 'on';
    getSelection().selectAllChildren(document.body);
    document.execCommand('InsertNestedUnorderedList');
    document.body.append(document.createElement('div'));
    document.body.innerHTML += '';
    document.execCommand('Delete');
    document.write("Test passes if it does not crash.");
  };
</script>
<body>
</body>