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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
#parent >li> span{background: #999999;display: block;width: 200px;border:1px solid #ECEEF2;}
li {line-height: 40px;display: block;}
li p{
display: inline-block;
width: 0px;
height: 0px;
border-left: 5px solid transparent;
border-right: 5px solid transparent;
border-top: 5px solid#2f2f2f;
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li>ul{display: none;}
li>ul>li{border: 1px solid #DEDEDE;width: 199px;}
#parent span:hover + ul{display: block;}
#parent span:hover >p{
display: inline-block;
width: 0px;
height: 0px;
border-top: 5px solid transparent;
border-bottom: 5px solid transparent;
border-left: 5px solid#2f2f2f;}
</style>
</head>
<body>
<ul id="parent">
<li>
<span><p></p>å表</span>
<ul>
<li>åå表</li>
<li>åå表</li>
<li>åå表</li>
</ul>
</li>
<li>
<span><p></p>å表</span>
<ul>
<li>åå表</li>
<li>åå表</li>
<li>åå表</li>
</ul>
</li>
<li>
<span><p></p>å表</span>
<ul>
<li>åå表</li>
<li>åå表</li>
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</ul>
</li>
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</body>
</html>