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<!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 type="text/css">
*{margin:0px;}
.main{ margin:0px auto; background:#0000FF; width:50%;}
</style>
</head>
<body>
<div class="main">123</div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta http-equiv="Content-Language" content="gb2312" />
<title>DY CSS Layout</title>
<style type="text/css">
html,body {
margin:0;
text-align:center;
}
div {
width:400px;
background:#eee;
margin:0 auto;
text-align:left;
}
</style>
</head>
<body>
<div>传说中的测试</div>
</body>
</html>
<!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">
<style>
.layout{background-color:#ccc;border:2px solid #333;width:30px;height:30px;margin:0 auto;}
</style>
<div class="layout"> </div>