HTML5 structural tags 初步

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html5 html

什么是HTML5？
HTML5, the latest version of the Hypertext Markup Language (HTML), is the most radical revision
of the language to date. It introduces many new features in a variety of areas. Some of the more
notable additions include:
• Built-in multimedia tags for audio and video
• A canvas tag for drawing content in the browser
• Smarter forms that let you do things such as validation through the use of a required attribute

HTML5 doctype

The doctype declaration should be the first thing in an HTML document, before the tag.

HTML4 approach:

Simple HTML page using div tags
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>
A Simple HTML Page Using Divs
</title>
</head>
<body>
<div id='header'>Header</div>
<div id='content'>Content</div>
<div id='footer'>Footer</div>
</body>
</html>

HTML5 new tags are:
1. header 标记一个section的头部
2. section 类似于一本书的章节
例子：
<header>Header</header>
<section>
<p>
This is an important section of the page.
</p>
</section>
<div id='footer
3. article 重要的内容块
例子：
<header>Header</header>
<section>
<article>
<p>
This is an important section of content on the page.
Perhaps a blog post.
</p>
</article>
<article>
<p>
This is an important section of content on the page.
Perhaps a blog post.
</p>
</article>
</section>
4. aside
例子：
<section>
<article>
<p>
This is an important section of content on the page.
Perhaps a blog post.
</p>
<aside>
<p>
This is an aside for the first blog post.
</p>
</aside>
</article>
<article>
ibm.com/developerWorks/ developerWorks®
New HTML5 structural tags Page 7 of 11
<p>
This is an important section of content on the page.
Perhaps a blog post.
</p>
</article>
5. footer
6. nav

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