<!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=gb2312" />
<title>无标题文档 </title>
<style>
*{border:1px solid #eee;}
body{
border-color:#09f;
}
#ul{list-style:none;width:800px;height:600px;margin:0 auto;padding:20px;}
#li1{width:200px;height:200px;border-color:red;position:relative;}
#li2{width:200px;height:150px;border-color:green;float:left;margin-left:-30px;margin-top:-202px;}
#li3{width:200px;height:100px;border-color:blue;float:left;margin-left:20px;margin-top:-202px;}
</style>
</head>
<body>
<ul id=#id>
<li id=li1>li1 </li>
<li id=li2>l i2dfsadfadfadfa </li>
<li id=li3>li3 </li>
</ul>
<div style="margin:300px; border:1px solid #00FF00; height:100px;float:left;width:300px">天下 </div>
</body>
</html>HTML code:
主要想问的是margin这个属性不是表示外边距的宽度吗。这边的#ul类标记mar
