The Modernizr JavaScript assists us detecting whether the web browser support the various available HTML5 and CSS3 web technologies. The following video clip shows the very basics of using this framework by showing how to download a customized version of modernizr and how to use the load function.
I have just complete do develop the Modernizr Basics new course for learning the basics of using this framework. You can find it at http://abelski.lifemichael.com. That course is available for free personal and academic usage.