article代表一个在文档、页面或者网站中自成一体的内容
其目的是为了让开或重用
譬如论坛的帖子、博客的文章、一片用户的评论、一个互动的widget小工具
article 会有一个标题（通常在header里），会有一个footer页脚
如果在aritcle内部再嵌套article
那就代表的article是与它外部的内容有关联，如博客文章下面的评论
标准article元素的用法：
<article>
<h1>文章标题</h1>
<p>文章内容</p>
<footer>
<p><small>版权</small></p>
</footer>
</article>
效果如下例如：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title> article </title>
</head>
<body>
<article>
<header>
<h1>王者荣耀</h1>
</header>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Aliquid esse odio quam quo repellat? Accusamus
atque, dicta dolore iste maxime odio odit sequi suscipit tempora ut. Aspernatur officia placeat
quibusdam!</p>
<p>Amet eos esse nisi numquam obcaecati quos repellat saepe. Ab alias aliquam assumenda consequuntur cumque
debitis, deserunt, enim expedita in molestias mollitia voluptatum! Cumque dicta laborum magni maiores
recusandae repudiandae!</p>
<p>Deleniti distinctio, eveniet magnam maiores odio officiis provident reprehenderit. Aliquid eius, enim
expedita labore magnam odit quae quaerat quisquam tempore voluptates? Cupiditate error nisi quaerat ratione
reiciendis sed soluta voluptas.</p>
<footer> © 2017
</footer> </article>
</body>
效果如下：
