<!DOCTYPE html>
<html>
<head>
  <script type="text/javascript">
    function doTest()
    {
      var editor1 = document.getElementById("editor1");
      editor1.focus();
      editor1.blur();
      document.getSelection().selectAllChildren(document.body);
      var editor2 = document.getElementById("editor2");
      var editorBody = editor2.contentDocument.body;
      editor2.contentDocument.getSelection().selectAllChildren(editorBody);
      editor2.focus();
    }
  </script>
</head>
<body>
<p>normal text</p>
<div id="editor1" contenteditable>content editable</div>
<iframe id="editor2" onload="doTest();"
  src="data:text/html,<script>document.designMode='on';</script><body>editable text</body>"></iframe>
</body>
</html>