Unless you've got a truckload of physical devices to test your webapp on, device emulators are the easiest option to get started testing on different platforms. Here are a few.
In Backbone 1.1, the options hash you pass into a new View is no longer automatically attached to the view. For those that like this pattern, here's how to reinstate the functionality.
Implementing page transitions in Backbone can seem non-trivial given the overall lack of opinion that Backbone provides. Here's an opinionated way to implement transitions by adding/removing CSS classes and leveraging CSS transitions.
Getting Coffeescript source maps working with Yeoman's directory structure.