aside标签通常用来表示当前页面或文章的附属信息部分，它可以包含与当前页面或主要内容相关的引用、侧边栏、广告、导航条以及其他类似的有别于主要内容的部分。
包裹文章的附属信息部分（article内）
放在article标签中，包裹与文章有关的参考资料、版权声明、作者信息、名词解释等附属信息。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>article_demo</title>
</head>
<body>
<article>
<header>
<h1>标题</h1>
<p>发布日期：<time pubdate="true">2020-03-09</time></p>
</header>
<p>此处是正文内容</p>
<aside>
<!-- aside在article内部，说明aside的内容是与文章相关的，例如参考文献 -->
<h1>参考文献</h1>
<ul>
<li>参考小凯哥博客</li>
</ul>
</aside>
<footer>
<p><small>此处是脚注，例如：PM 小凯哥<xuxinkai.cn>版权所有</small></p>
</footer>
</article>
</body>
</html>包裹页面全局附属信息（article之外）
这里最常见的形式是网站侧边栏，例如最新评论、广告单元、热门文章推荐等。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>article_demo</title>
</head>
<body>
<article>
<header>
<h1>标题</h1>
<p>发布日期：<time pubdate="true">2020-03-09</time></p>
</header>
<p>此处是正文内容</p>
<aside>
<!-- aside在article内部，说明aside的内容是与文章相关的，例如参考文献 -->
<h1>参考文献</h1>
<ul>
<li>参考小凯哥博客</li>
</ul>
</aside>
<footer>
<p><small>此处是脚注，例如：PM 小凯哥<xuxinkai.cn>版权所有</small></p>
</footer>
</article>
<aside>
<nav>
<h2>热门文章</h2>
<ul>
<li>产品经理真牛逼</li>
<li>前端真厉害</li>
<li>程序员真辛苦</li>
</ul>
</nav>
</aside>
</body>
</html>
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