Классическая схема для сайта на HTML5
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<title>Simple HTML5 blog</title>
<!--[if IE]>
<script>
document.createElement('header');
document.createElement('nav');
document.createElement('section');
document.createElement('article');
document.createElement('aside');
document.createElement('footer');
</script>
<![endif]-->
<style>
styles
</style>
</head>
<body>
<header>
blog header
</header>
<nav>
navigation
</nav>
<section>
<article>
<header>
Article header
</header>
Article
</article>
<article>
<header>
Article header
</header>
Article
</article>
</section>
<aside>
sidebar content
</aside>
<footer>
copyright
</footer>
</body>
</html>