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http://www.w3school.com.cn/css/css_pseudo_elements.asp
div:before,div:after{ content:""; display:table;} div:after{ clear:both}实际使用,定义一个清除浮动的样式
div.clearfix:before,div.clearfix:after { content: " "; display: table;}div.clearfix:after { clear: both;}div.clearfix { overflow: visible;}div.clearfix XXX { float: left;}==用于清除浮动的div
a:link,a:visited { color: #333; text-decoration: none;}a:hover { color: #c00; text-decoration: none;}h1 a:link,h1 a:visited,h2 a:link,h2 a:visited,h3 a:link,h3 a:visited { color: #333;}h1 a:hover,.h2 a:hover,h3 a:hover { color: #c00;}a:focus { outline: none;}a.f-blue:link,a.f-blue:visited { color: #2981a9; text-decoration: none;}a.f-blue:visited { color: #025d87; text-decoration: none;}a.f-undline:link,a.f-undline:visited { text-decoration: underline;}a.f-undline:visited { text-decoration: underline;}
input:focus,textarea:focus { border-color: #9cf; box-shadow: none;}
box-shadow: 0px 3px 2px red;box-shadow: 0px(向右) 3px(向下) 2px(四周扩大) red(阴影颜色);
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