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<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script language="javascript" type="text/javascript">
function getNode() {
var parentNode = document.all? document.selection.createRange().parentElement():
window.getSelection().focusNode.parentNode;
alert(parentNode.tagName);
}
</script>
</head>
<body>
<div name="parent">
<input type="button" value="getNode" onclick="getNode()">
<span>1234567</span>
</div>
</body>
</html>