Spartan Ajax - No more HTML

This is not a new idea, look at Cappuccino and Atlas.

Lots of systems allow one to build an interface up programatically but they often provide the declarative model as well (Look at Google's Android platform) because any non-trivial interface results in a LOT of code.

Markup is very good at implicit relationships, this is stuff that takes up space and time in code. I think the other big drawback is that you can write markup and a rendering engine or whatever consumer of that markup can attempt to optimize the interface creation, maybe its faster to instantiate 100 table cells and then make the rows and then the table, if this code is editable you could inadvertently mess up your code.

Either way it seems like a lot of work for no gain, you end up with a big pile of interface and if its markup or code or whatever, if its written by a tool its going to be no fun to manually work with.