What the f**k is a polyfill?

So you know you want to use all the latest HTML5 and CSS3 goodness, but those darn browser makers just can't keep up with you.

You don't want to leave users with older browsers out in the cold, so what can you do?

You can use a polyfill.

Polyfills? WTF?

This session will explain the role of polyfills and how to use them, and why you might sometimes choose not to [hint - performance].