关于清楚浮动的问题

DC***

在这个例子中，新添加的div不本来就是块级元素吗，于什么还要用到display：block呢？

咖***

哈哈，我也不知道浮动到底是怎么清除的，但是这段代码确实可以起作用，每次写新项目直接粘过去就好

m4505***

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sw8***

content只能与：：before或：：after配合使用，伪元素默认是行内元素，所以写display:block没有任何毛病。
如果不想用伪元素可以改成
.clearfix{
clear:both;
height:0
}

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