.clearfix: After {
Content: ""; / setting contents empty /
height: 0; / height of 0 /
Line-height: 0; / line-height 0 /
the display: Block; / text into block element /
visibility: hidden; / elemental hide /
Clear: both; / Clear float /
}
Clear float of three ways
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Origin www.cnblogs.com/hff-syt/p/12006114.html
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