html tags in ie8 polyfill http://www.nickyeoman.com/blog/html/118-html5-tags-in-ie8

html_5_ie_8.html

<!--[if lt IE 9]>
<script>
document.createElement('header');
document.createElement('nav');
document.createElement('section');
document.createElement('article');
document.createElement('aside');
document.createElement('footer');
document.createElement('hgroup');
</script>
<![endif]-->