Bare-Bones HTML5 "Shiv" for IE8 and IE7

html5_for_ie.js

var html5Elements = [
    'abbr', 'article', 'aside', 'bdi', 'data', 'datalist', 
    'figcaption', 'figure', 'footer', 'header', 'main', 'mark', 'meter', 
    'nav', 'output', 'progress', 'section', 'summary', 'time'];
    headElement = document.head || document.getElementsByTagName('head')[0],
    blockCSS = 'article,aside,figcaption,figure,footer,header,main,nav,section{display: block;}';
    insertStyle = document.createElement('style');
for (var i = 0; i < html5Elements.length; i++) {
    document.createElement(html5Elements[i]);
}
insertStyle.type = 'text/css';
if (insertStyle.styleSheet){
    insertStyle.styleSheet.cssText = blockCSS;
}
else {
    insertStyle.appendChild(document.createTextNode(blockCSS));
}
headElement.appendChild(insertStyle);