While the demo site doesn't go this far, it would be possible to send minimal code to the client with basic client-sniffing 'intentions', then use that information to trigger some wacky ajax or redirect with more targeted markup.

Many 'intentions' respond to live events, so sometimes it makes sense to give all the markup up front. Take a look at some of the goofier examples, like animation (http://intentionjs.com/2013/03/12/walking-man.html).