The Web is increasingly happening in realtime. With websites such as Facebook and Twitter leading the way, users are coming to expect that all sites should serve content as it occurs—on smartphones as well as computers. This book shows you how to build realtime user experiences by adding chat, streaming content, and including more features on your site one piece at a time, without making big changes to the existing infrastructure. You'll also learn how to serve realtime content beyond the browser.

Throughout the book are many practical JavaScript and Python examples for advanced web developers that you can use on your site now. And in the final chapter, you'll build a location-aware game that combines all of the technologies discussed.