HTML 元素和有效 DOCTYPES

本节课，我们学下HTML 元素和有效 DOCTYPES。

HTML 元素 – 有效 DOCTYPES

下面的表格列出了所有的 HTML5/HTML 4.01/XHTML 元素，以及它们会出现在什么文档类型 (!DOCTYPE) 中：

		HTML 4.01 / XHTML 1.0
<a>	Yes	Yes	Yes	Yes	Yes
<abbr>	Yes	Yes	Yes	Yes	Yes
<acronym>	No	Yes	Yes	Yes	Yes
<address>	Yes	Yes	Yes	Yes	Yes
<applet>	No	Yes	No	Yes	No
<area>	Yes	Yes	Yes	Yes	No
<article>	Yes	No	No	No	No
<aside>	Yes	No	No	No	No
<audio>	Yes	No	No	No	No
<b>	Yes	Yes	Yes	Yes	Yes
<base>	Yes	Yes	Yes	Yes	Yes
<basefont>	No	Yes	No	Yes	No
<bdi>	Yes	No	No	No	No
<bdo>	Yes	Yes	Yes	Yes	No
<big>	No	Yes	Yes	Yes	Yes
<blockquote>	Yes	Yes	Yes	Yes	Yes
<body>	Yes	Yes	Yes	Yes	Yes
<br>	Yes	Yes	Yes	Yes	Yes
<button>	Yes	Yes	Yes	Yes	Yes
<canvas>	Yes	No	No	No	No
<caption>	Yes	Yes	Yes	Yes	Yes
<center>	No	Yes	No	Yes	No
<cite>	Yes	Yes	Yes	Yes	Yes
<code>	Yes	Yes	Yes	Yes	Yes
<col>	Yes	Yes	Yes	Yes	No
<colgroup>	Yes	Yes	Yes	Yes	No
<command>	Yes	No	No	No	No
<datalist>	Yes	No	No	No	No
<dd>	Yes	Yes	Yes	Yes	Yes
<del>	Yes	Yes	Yes	Yes	No
<details>	Yes	No	No	No	No
<dfn>	Yes	Yes	Yes	Yes	Yes
<dir>	No	Yes	No	Yes	No
<div>	Yes	Yes	Yes	Yes	Yes
<dl>	Yes	Yes	Yes	Yes	Yes
<dt>	Yes	Yes	Yes	Yes	Yes
<em>	Yes	Yes	Yes	Yes	Yes
<embed>	Yes	No	No	No	No
<fieldset>	Yes	Yes	Yes	Yes	Yes
<figcaption>	Yes	No	No	No	No
<figure>	Yes	No	No	No	No
<font>	No	Yes	No	Yes	No
<footer>	Yes	No	No	No	No
<form>	Yes	Yes	Yes	Yes	Yes
<frame>	No	No	No	Yes	No
<frameset>	No	No	No	Yes	No
<h1> to <h6>	Yes	Yes	Yes	Yes	Yes
<head>	Yes	Yes	Yes	Yes	Yes
<header>	Yes	No	No	No	No
<hgroup>	Yes	No	No	No	No
<hr>	Yes	Yes	Yes	Yes	Yes
<html>	Yes	Yes	Yes	Yes	Yes
<i>	Yes	Yes	Yes	Yes	Yes
<iframe>	Yes	Yes	No	Yes	No
<img>	Yes	Yes	Yes	Yes	Yes
<input>	Yes	Yes	Yes	Yes	Yes
<ins>	Yes	Yes	Yes	Yes	No
<kbd>	Yes	Yes	Yes	Yes	Yes
<keygen>	Yes	No	No	No	No
<label>	Yes	Yes	Yes	Yes	Yes
<legend>	Yes	Yes	Yes	Yes	Yes
<li>	Yes	Yes	Yes	Yes	Yes
<link>	Yes	Yes	Yes	Yes	Yes
<map>	Yes	Yes	Yes	Yes	No
<mark>	Yes	No	No	No	No
<menu>	Yes	Yes	No	Yes	No
<meta>	Yes	Yes	Yes	Yes	Yes
<meter>	Yes	No	No	No	No
<nav>	Yes	No	No	No	No
<noframes>	No	Yes	No	Yes	No
<noscript>	Yes	Yes	Yes	Yes	Yes
<object>	Yes	Yes	Yes	Yes	Yes
<ol>	Yes	Yes	Yes	Yes	Yes
<optgroup>	Yes	Yes	Yes	Yes	Yes
<option>	Yes	Yes	Yes	Yes	Yes
<output>	Yes	No	No	No	No
<p>	Yes	Yes	Yes	Yes	Yes
<param>	Yes	Yes	Yes	Yes	Yes
<pre>	Yes	Yes	Yes	Yes	Yes
<progress>	Yes	No	No	No	No
<q>	Yes	Yes	Yes	Yes	Yes
<rp>	Yes	No	No	No	No
<rt>	Yes	No	No	No	No
<ruby>	Yes	No	No	No	No
<s>	Yes	Yes	No	Yes	No
<samp>	Yes	Yes	Yes	Yes	Yes
<script>	Yes	Yes	Yes	Yes	Yes
<section>	Yes	No	No	No	No
<select>	Yes	Yes	Yes	Yes	Yes
<small>	Yes	Yes	Yes	Yes	Yes
<source>	Yes	No	No	No	No
<span>	Yes	Yes	Yes	Yes	Yes
<strike>	No	Yes	No	Yes	No
<strong>	Yes	Yes	Yes	Yes	Yes
<style>	Yes	Yes	Yes	Yes	Yes
<sub>	Yes	Yes	Yes	Yes	Yes
<summary>	Yes	No	No	No	No
<sup>	Yes	Yes	Yes	Yes	Yes
<table>	Yes	Yes	Yes	Yes	Yes
<tbody>	Yes	Yes	Yes	Yes	No
<td>	Yes	Yes	Yes	Yes	Yes
<textarea>	Yes	Yes	Yes	Yes	Yes
<tfoot>	Yes	Yes	Yes	Yes	No
<th>	Yes	Yes	Yes	Yes	Yes
<thead>	Yes	Yes	Yes	Yes	No
<time>	Yes	No	No	No	No
<title>	Yes	Yes	Yes	Yes	Yes
<tr>	Yes	Yes	Yes	Yes	Yes
<track>	Yes	No	No	No	No
<tt>	No	Yes	Yes	Yes	Yes
<u>	No	Yes	No	Yes	No
<ul>	Yes	Yes	Yes	Yes	Yes
<var>	Yes	Yes	Yes	Yes	Yes
<video>	Yes	No	No	No	No
<wbr>	Yes	No	No	No	No