<!DOCTYPE html>
<html>
<head>
<style>
#header {
background-color:black
color:white
text-align:center
padding:5px
}
#nav {
line-height:30px
background-color:#eeeeee
height:300px
width:100px
float:left
padding:5px
}
#section {
width:350px
float:left
padding:10px
}
#footer {
background-color:black
color:white
clear:both
text-align:center
padding:5px
}
</style>
</head>
<body>
<div id="header">
<h1>第一层</h1>
</div>
<div id="nav">
第二层左侧
</div>
<div id="section">
第二层右侧
</div>
<div id="footer">
第三层
</div>
</body>
</html>
标准格式如下：<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=UTF-8" />
<title>Your Website</title>
</head>
<body>
<header>
<nav>
<ul>
<li>Your menu</li>
</ul>
</nav>
</header>
<section>
<article>
<header>
<h2>Article title</h2>
<p>Posted on <time datetime="2009-09-04T16:31:24+02:00">September 4th 2009</time>by <a href="#">Writer</a>- <a href="#comments">6 comments</a></p>
</header>
<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.</p>
</article>
<article>
<header>
<h2>Article title</h2>
<p>Posted on <time datetime="2009-09-04T16:31:24+02:00">September 4th 2009</time>by <a href="#">Writer</a>- <a href="#comments">6 comments</a></p>
</header>
<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.</p>
</article>
</section>
<aside>
<h2>About section</h2>
<p>Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
</aside>
<footer>
<p>Copyright 2009 Your name</p>
</footer>
</body>
</html>
