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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>div自动高度</title>
<style type="text/css">
<!--
.line{ border: 1px dashed #333;}
.con {margin:auto; background-color:#FFFFCC;}
.top{ height:200px; width:80%; background-color:#eee; margin:0 auto 10px auto;}
.cl{ clear:both;}
.con1 { overflow:auto; height:auto;margin:auto; background-color:#FFFFCC;}
.top1{ height:200px; width:80%; background-color:#eee; margin:0 auto;}
-->
</style>
</head>
<body>
<h4>利用clear自动高度，因为TOP层有下边界</h4>
<div class="con line">
<div class="top line"></div>
<div class="top line"></div>
<div class="top line"></div>
<div class="top line"></div>
<div class="top line"></div>
<div class="top line"></div>
<div class="cl"></div>
</div>
<h4>利用overflow和高度的自动高度实现，无下边界的情况</h4>
<div class="con1 line">
<div class="top1 line"></div>
<div class="top1 line"></div>
<div class="top1 line"></div>
<div class="top1 line"></div>
<div class="top1 line"></div>
<div class="top1 line"></div>
</div>
</body>
</html>
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