‘320 and Up’ prevents mobile devices from downloading desktop assets by using a tiny screen’s stylesheet as its starting point. Try this page at different window sizes and on different devices to see it in action.
Handlebars.js is an extension to the Mustache templating language created by Chris Wanstrath. Handlebars.js and Mustache are both logicless templating languages that keep the view and the code separated like we all know they should be.