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<html xmlns="http://www.w3.org/1999/xhtml">

<head>
<script>
function foopy()
{
  var optgroup = document.getElementById("optgroup");
  var newspan = document.createElementNS("http://www.w3.org/1999/xhtml", "span");
  optgroup.insertBefore(newspan, optgroup.firstChild);
}
</script>
</head>

<body onload="foopy()">

<select><optgroup label="optgroup" id="optgroup"><option>option</option></optgroup></select>

</body>

</html>