If you're willing to go through a build step, it's fairly easy to get everything into a single document. Sproutcore does it today with no special configuration.

If you're willing to go through a build step, it's fairly easy to get everything into a single document. Sproutcore does it today with no special configuration. There are tricks to getting large amounts of content to load in a performant manner and you'd have to do history API to get transparent support for an entire site but neither hurdle is particularly high. You don't even have to invent a new format for specifying what makes up the site since the web archive standard already exists.