selection-modify-extend-backward-character-to-outside-body-in-designMode.html

<!DOCTYPE html>
<meta charset="utf-8">
<script>
onload = () => {
  document.designMode = 'on';
  getSelection().selectAllChildren(document.body);
  getSelection().modify('extend', 'backward', 'character');
};
</script>
<audio controls>

chromium/third_party/blink/web_tests/external/wpt/editing/crashtests/selection-modify-extend-backward-character-to-outside-body-in-designMode.html