Код HTML:
<!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>  
       header,nav, section, article, aside, footer {  display: block}
    </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>