Thanks! I should also say that I think CSS is great --- there's nothing like trying to come up with your own solution to make you appreciate the tradeoffs that

Thanks! I should also say that I think CSS is great --- there's nothing like trying to come up with your own solution to make you appreciate the tradeoffs that other folks have made. We had the advantage of starting from scratch in a more constrained problem space of UI layout, rather than CSS's reflowable documents + UI sometimes + 20 years of backward compatibility. Daniel Jackson's work on conceptual design (http://sdg.csail.mit.edu/projects/conceptual/ http://sdg.csail.mit.edu/projects/conceptual/) is a great starting place for thinking about this kind of thing.