Appendix A. Modernizr

Modernizr is an open source JavaScript library that allows us to test for individual features of HTML5 in our users’ browsers. Instead of testing just for a particular browser and trying to make decisions based on that, Modernizr allows us to ask specific questions like: “Does this browser support geolocation?” and receive a clear “yes” or “no” answer.

The first step to using Modernizr is to download it from the Modernizr site, at http://modernizr.com.