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<!DOCTYPE html>
<html>
<head>
<title></title>
<style>
ul,li{
list-style:none;
padding:0;
margin:0;
border:1px solid;
width:98px;
}
li{
position:relative;
overflow:hidden;
}
li>ul{
position:absolute;
top:0;
left:98px;
}
li:hover{
overflow:visible;
}
</style>
</head>
<body>
<ul>
<li>
<span>1</span>
<ul>
<li><span>1-1</span>
<ul>
<li>1-1-1</li>
<li>1-1-2</li>
<li>1-1-3</li>
</ul>
</li>
<li><span>1-2</span>
<ul>
<li>1-2-1</li>
<li>1-2-2</li>
<li>1-2-3</li>
</ul>
</li>
<li><span>1-3</span></li>
</ul>
</li>
<li><span>2</span></li>
<li><span>3</span></li>
</ul>
</body>
<script>
</script>
</html>