css如何清除浮动
css中可以用 clearfix清除浮动
实例：
<html >
<head>
<title> css用clearfix清除浮动实例</title>
<meta name="generator" content="editplus" />
<meta name="author" content="" />
<meta name="keywords" content="" />
<meta name="description" content="" />
</head>
<body>
<style type="text/css">
/**//*所有主流浏览器都支持 :after 伪元素。*/
.clearfix:after{}{content:".";display:block;height:0;clear:both;visibility:hidden}
.clearfix{}{*+height:1%;}/**//*不知道有什么用处，不加ie7也没有问题*/
.box{}{ background:#111;width:500px; position:relative;}
.l{}{float:left; background:#333;width:200px; height:100px;}
.r{}{float:right;background:#666;width:200px; height:200px;}
.s{}{width:100px; height:100px;background:#999;position:absolute;right:-50px;;}
</style>
<div class="box clearfix">
<div class="l">left</div>
<div class="r">right</div>
<div class="s">absolute</div>
</div>
</body>
</html>参考资料： css用clearfix清除浮动 http://www.studyofnet.com/news/196.html
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