zoom详解:http://blog.csdn.net/u014516981/article/details/51824607
原文:http://www.cnblogs.com/zhongjiang/p/6440355.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
.bgg{
padding: 10px;
background: yellow;
overflow: hidden;
}
.f{
width: 100px;
height: 100px;
background: red;
float: left;
}
/*.clear{
clear: both;
}*/
/*.bgg:after{
content: ‘‘;
display: block;
clear: both;
}*/
</style>
</head>
<body>
<div class="bgg">
<div class="f">1</div>
<div class="f">2</div>
<div class="f">3</div>
<!--<div class="clear"></div> -->
</div>
</body>
</html>
原文：http://www.cnblogs.com/LWJ-booke/p/7478041.html