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导航position:absolute

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>导航position:absolute</title>
<style type="text/css">
.a1{ width:120px; height:40px; background-color:#F00; position:absolute; cursor:pointer;  overflow:hidden}
.a1:hover{
    overflow:visible; }
.a2{ width:120px; height:40px; background-color:#F69; position:absolute; cursor:pointer; top:40px; overflow:hidden;}
.a2:hover{
    overflow:visible}
.a3{ width:120px; height:40px; background-color:#63F; position:absolute; cursor:pointer; left:120px;}
.a4{ width:120px; height:40px; background:#0F0; position:absolute; cursor:pointer; top:80px; overflow:hidden}
.a4:hover{
    overflow:visible}
.a5{ width:120px; height:40px; background:#0FF; position:absolute; cursor:pointer; left:120px;}
.a6{ width:120px; height:40px; background-color:#0C3; position:absolute; cursor:pointer; top:120px; overflow:hidden}
.a6:hover{
    overflow:visible}
.a7{ width:120px; height:40px; background-color:#CF6; position:absolute; cursor:pointer; left:120px;}
</style>
</head>

<body>
<div class="a1">
<div class="a2"><div class="a3"></div></div>
<div class="a4"><div class="a5"></div></div>
<div class="a6"><div class="a7"></div></div>
</div>

</div>

</body>
</html>

 

导航position:absolute