<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script>
addEventListener("load", () => {
  const dialog = document.querySelector("dialog");
  dialog.showModal();
  dialog.close();
  document.execCommand("justifyLeft");
  document.execCommand("delete");
});
</script>
</head>
<body><dialog contenteditable>
</dialog></body>
</html>
