Typical technology sessions walk through a trivial example application to give you a taste of the technology. So hey, let’s do the opposite! In this session we’ll dissect a highly complex single page application that's soon to be used by over 1,000 automotive dealerships to finance and sell cars. This is an HTML5 application that our Silverlight guys said couldn’t be built. We’ll walk through how to manage a pure client-side application with 1000’s of lines of custom JavaScript and review how Web API, Knockout, Durandal, RequireJS, KendoUI, and surprisingly little jQuery can join forces to make the browser sing. You’ll gain a clear understanding of when a single page app approach makes sense and learn how to pragmatically divide responsibilities between the client and server. And we’ll close out by comparing the performance of complex web apps in modern browsers to older versions of Internet Explorer. This session will give you an appreciation for how far you can push ultra-responsive client-side rendering in the real-world.