推荐写法
<!--(1)过渡型（Transitional ）-->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!--(2)严格型（Strict ）-->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!--(3)框架型（Frameset ）-->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
<!--设定一个名字空间（Namespace）lang="zh-CN"/-->
<html xmlns="http://www.w3.org/1999/xhtml" lang="zh-CN">
<head>
<!--声明你的编码语言:GB2312/UTF-8/Unicode/ISO-8859-1-->
<meta http-equiv="Content-Type" content="text/html; charset=GB2312" />
<meta http-equiv="Content-Language" content="zh-CN" />
<!--为搜索引擎准备的内容-->
<!--允许搜索机器人搜索站内所有链接。如果你想某些页面不被搜索，推荐采用robots.txt方法-->
<meta content="all" name="robots" />
<!--设置站点作者信息-->
<meta name="author" content="ajie@netease.com,阿捷" />
<!--设置站点版权信息-->
<meta name="Copyright" content="www.w3cn.org,自由版权,任意转载" />
<!--站点的简要介绍(推荐)-->
<meta name="description" content="新网页设计师。web标准的教程站点，推动web标准在中国的应用" />
<!--站点的关键词(推荐)-->
<meta content="designing, with, web, standards, xhtml, css, graphic, design, layout, usability, ccessibility, w3c, w3, w3cn, ajie" name="keywords" />
<!--收藏夹小图标-->
<link rel="icon" href="/favicon.ico" type="image/x-icon" />
<link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" />
<title>网页标题</title>
<!--连接样式表-->
<link rel="stylesheet" rev="stylesheet" href="css/style.css" type="text/css" media="all" />
<style type="text/css" media="all">@import url( css/style01.css );</style>
<!--RSS-->
<link rel="alternate" type="application/rss+xml" title="greengnn's space" href="http://www.jluvip.com/blog/feed.asp" />
<!--JS-->
<script src="js/common.js" type="text/javascript" language="JavaScript" "></script>
</head>
<body></body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!--(2)严格型（Strict ）-->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!--(3)框架型（Frameset ）-->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
<!--设定一个名字空间（Namespace）lang="zh-CN"/-->
<html xmlns="http://www.w3.org/1999/xhtml" lang="zh-CN">
<head>
<!--声明你的编码语言:GB2312/UTF-8/Unicode/ISO-8859-1-->
<meta http-equiv="Content-Type" content="text/html; charset=GB2312" />
<meta http-equiv="Content-Language" content="zh-CN" />
<!--为搜索引擎准备的内容-->
<!--允许搜索机器人搜索站内所有链接。如果你想某些页面不被搜索，推荐采用robots.txt方法-->
<meta content="all" name="robots" />
<!--设置站点作者信息-->
<meta name="author" content="ajie@netease.com,阿捷" />
<!--设置站点版权信息-->
<meta name="Copyright" content="www.w3cn.org,自由版权,任意转载" />
<!--站点的简要介绍(推荐)-->
<meta name="description" content="新网页设计师。web标准的教程站点，推动web标准在中国的应用" />
<!--站点的关键词(推荐)-->
<meta content="designing, with, web, standards, xhtml, css, graphic, design, layout, usability, ccessibility, w3c, w3, w3cn, ajie" name="keywords" />
<!--收藏夹小图标-->
<link rel="icon" href="/favicon.ico" type="image/x-icon" />
<link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" />
<title>网页标题</title>
<!--连接样式表-->
<link rel="stylesheet" rev="stylesheet" href="css/style.css" type="text/css" media="all" />
<style type="text/css" media="all">@import url( css/style01.css );</style>
<!--RSS-->
<link rel="alternate" type="application/rss+xml" title="greengnn's space" href="http://www.jluvip.com/blog/feed.asp" />
<!--JS-->
<script src="js/common.js" type="text/javascript" language="JavaScript" "></script>
</head>
<body></body>
</html>