Using Modernizr to test for tablet and mobile - Opinions wanted

Question

I want to use Modernizr to detect whether a user is view a site on a desktop, tablet or mobile device.

My initial first thoughts are obviously to check screen sizes

Answer 1

You can use the following extension for Modernizr: https://www.npmjs.org/package/mobile-detect

Or (without Modernizr) you could use Restive.JS to add a ".phone" or ".tablet"-class to your body: http://docs.restivejs.com

(Look for "formfactor" down the page.)