.group:after,#content:after,#sidebar:after,#some .other .thing:after{visibility: hidden;display: block;font-size: 0;content: " ";clear: both;height: 0;zoom:1;}这段话是什么意思?
实例
下面的例子在每个链接后插入括号中的 URL:
a:after { content: " (" attr(href) ")"; }