1.IE6浮动会产生双倍边距，使用display：inline;
2.css中那些属性会继承于父元素？ color,font-size.
3.css模块化的作用，结构良好，扩展性强，重用性好，可维护性高
4.如何居中一个浮动的div?
div{
width:300px;height:200px;
position:relative;
margin:-100px 0 0 -150px;
top:50%;left:50%;
}
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