两个代码有什么区别？为什么页面显示不同？

代码1：

<!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=utf-8" />
<title>无标题文档</title>
<style type="text/css">
*{margin:0; padding:0;}
#wrap{margin:0 auto; width:960px; background:#666;}
#header{background:#0F3; width:100%;}
#mainbody{background:#33F; width:100%;}
#footer{background:#999; width:100%;}
.left{width:800px;height:200px; background:#FF0; float:left;}
.right{width:140px; height:500px; background:#F0F; float:left;}
</style>
</head>

<body>
<div id="wrap">
	<div id="header">header</div>
    <div id="mainbody">
    	<div class="left">left</div>
        <div class="right">right</div>
    </div>
    <div id="footer">footer</div>
</div>
</body>
</html>

代码2：

<!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=utf-8" />
<title>无标题文档</title>
<style type="text/css">
* {
    margin:0;
	padding:0;
}
#wrap {
	background:#00C;
	margin:0 auto;
	width:960px;
}
#header {
	background:#FF3300;
	width:100%;
}
#mainbody {
	    background:#FC0;
	   width:100%;
}
.left {
	width:800px;
	height:200px;
	background:#000;
    float:left;
}
.right {
width:140px;
height:500px;
background:#690;
float:left;
}
#footer {
	background:#639;
	width:100%;
}
</style>
</head>

<body>
<div id="wrap">
  <div id="header">头部</div>
  <div id="mainbody">
    <div class="left"></div>
    <div class="right"></div>
  </div>
  <div id="footer">版权部分</div>
</div>
</body>
</body>
</html>