How to Make All Browsers Render HTML5 Mark-up Correctly ? Even IE6

HTML 5 provides some great new features for web designers who want to code readable, semantically-meaningful layouts. However, support for HTML 5 is still evolving, and Internet Explorer is the last to add support. In this tutorial, we?ll create a common layout using some of HTML 5?s new semantic elements, then use JavaScript and CSS to make our design backwards-compatible with Internet Explorer. Yes, even IE 6.

[TheLegendOfNiko]

What if I have a bunch of classes set? How can I get a Chrome optimized website to be optimized for Safari or Firefox?

[justy]

I think this video is slightly obsolete but it's still a great video.

[jamilgotcher]

What would be an example of a great feature in HTML 5 that would be worth doing all of this extra coding for? 

[ahmedmubeen]

you don't think html5shiv.js is far better then this nasty javascript for every element you wrote in script tag