闭合浮动元素

闭合浮动元素：针对firefox用overflow:auto。针对ie用*height:1%或者zoom:1。个人觉得overflow:auto少用为妙，会有些莫明其妙的问题。
最好用这个方法：
.clearfix:after {
content: "."; 
display: block; 
height: 0; 
clear: both; 
visibility: hidden;
}
/* Hides from IE-mac \*/
* html .clearfix {height: 1%;}
/* End hide from IE-mac */

 

 

 

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.clearfix:before, .clearfix:after { content: "\0020"; display: block; height: 0; overflow: hidden; }
.clearfix:after { clear: both; }
.clearfix { zoom: 1; }

 

 

 

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.clearfix:after { content: "."; display: block; height: 0; clear: both; visibility: hidden; } .clearfix { zoom: 1; }