CSS伪元素before、after妙用

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>利用before.after</title>
<style>
body, ul, li, p {margin:0; padding:0; font-family:Verdana, Geneva, sans-serif;}
ul li {list-style:none;}
img {border:0 none}
.focus {background:rgba(250,250,250,0.25); width:174px; height:174px; border:1px dashed #666; position:absolute; left:0px; top:0px; display:none;}
.focus:before {width:174px; height:134px; border-left:1px solid #fff; border-right:1px solid #fff; content:‘‘; position:absolute; left:-1px; top:20px;}
.focus:after {width:134px; height:174px; border-top:1px solid #fff; border-bottom:1px solid #fff; content:‘‘; position:absolute; top:-1px; left:20px;}
.content .focus {display:block;}

</style>
</head>

<body>


<div class="content">
<a href=""><img src="jiawin_1.jpg" />
  <p class="focus"></p></a>
</div>


</body>
</html>

http://www.jiawin.com/css-before-after

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