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<!DOCTYPE html>
<html>
<head>
  <script type="text/javascript">
    function doTest()
    {
      document.getSelection().selectAllChildren(document.body);
      var editor = document.getElementById("editor");
      var editorBody = editor.contentDocument.body;
      editor.contentDocument.getSelection().selectAllChildren(editorBody);
    }
  </script>
</head>
<body>
<p id="text">normal text</p>
<div>content editable</div>
<iframe id="editor" onload="doTest();"
  srcdoc="<body>editable text</body>"></iframe>
</body>
</html>