<html>
<head>
<script type="text/javascript">

function boom()
{
  document.addEventListener("DOMNodeInserted", x, false);
    
  function x()
  {
    document.removeEventListener("DOMNodeInserted", x, false);
    document.execCommand("insertParagraph", false, "");
  }

  document.execCommand("insertorderedlist", false, "");
}

</script>
</head>

<body contenteditable="true" onload="boom()"></body>

</html>