<html>
<head>
<style type="text/css">
div{width:100px;height:100px;background-color:orange;}
</style>
</head>
<body>
<div id="box">123</div>
<script type="text/javascript">
var box=document.getElementById('box');
var w=box.style.width;
var h=box.style.height;
alert(w);
</script>
</body>
</html>
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