Version 0.9 is the initial public release of Modernizr. It includes tests for a variety of CSS 3 features and an HTML 5 element styling enabler.

Faruk Ateş :

What makes Modernizr different from a lot of other, existing approaches is that it doesn’t use any UserAgent sniffing at all—in fact, Modernizr was partially designed and developed precisely to put an end to UA sniffing. It is a bad, unsafe and unreliable practice so the more alternatives we have to do it right, the better.