1、css伪类和伪元素
1.1 css2中的伪类:http://w3school.com.cn/css/css_pseudo_classes.asp
1.2 单冒号与双冒号的区别:http://www.alixixi.com/web/a/2012030779081.shtml
posted on 2016-05-09 17:47 izumi 阅读(125) 评论(0) 编辑 收藏 举报
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