<!DOCTYPE?html>
<html>
<head>
????<meta?charset="utf-8">
????<style?type="text/css">
????????body{margin:?0;padding:?0;}
????????.left{width:?200px;height:?500px;background:?#aaa;float:?left;}
????????.middle{height:?500px;background:?#fff;float:?left;}
????????.right{width:?300px;height:?500px;background:?#ccc;float:?right;}
????</style>
</head>
<body>
????<div>1</div>
????<div>2</div>
????<div>3</div>
</body>
</html>
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