H5最佳格式
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>html5</title>
<link rel="stylesheet" href="">
<script src=""></script>
</head>
<body>
<header>我是头部</header>
<nav>我是导航</nav>
<aside>我是侧边栏</aside>
<article>
<h1>我是文章</h1>
<time>2017</time>
</article>
<footer>我是头部</footer>
</body>
</html>
