HTML Bridge browser compatibility?

Is the HTML Bridge renderer engine based on any known toolkit?  I'm asking because I'm using the Dojo toolkit for our plugin app, and dojo themes don't seem to work at all in the HTML bridge.  Now I'm starting to wonder what other aspects of our app ported to the HTML bridge may not work.  Stuff in our existing app that worked in Firefox, IE and Chrome doesn't work when rendered via the HTML Bridge interface.


If you have any information on about the HTML bridge browser compatibility, I would be glad to learn about it.


Thanks,


Eric