:160px;
margin-left:-460px;
}
</pre>
</div>
</div>
<div id="footer">footer <br/><a href="http://www.dudo.org/" style="color:#000;text-decoration:none;">http://www.dudo.org/</a>
</div>
</div>
</body>
</html>
代码2（自己查看运行效果）
<!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>
<title> div+css布局中的结构和表现分离 </title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<style type="text/css">
body { font-size:middle;font-family:Tahoma,Arial, Helvetica, sans-serif,"雅黑","宋体"; background-color:#999;}
div { background-color:#ccc; }
#wrap {
width:760px;
padding:10px;
margin:0 auto;
background-color:#fff;
}
#header {
height:100px;
}
#content {
height:300px;
margin-top:10px;
background-color:#fff;
}
#primaryContent {
float:left;
height:300px;
width:290px;
}
#secondaryContent {
float:left;
height:300px;
width:290px;
margin-left:10px;
}
#sideContent {
float:left;
height:300px;
width:160px;
margin-left:10px;
}
#footer {
height:100px;
margin-top:10px;
}
pre { font-family:tahoma; }
</style>
</head>
<body>
<div id="wrap">
<div id="header">header
</div>
<div id="content">
<div |
