I'm not sure what I think about this project, is it a good educational aid, or is it favoring an aesthetic understanding of markup languages over a syntactic/semantic one?
P. Dragicevic, S. Huot, и F. Chevalier. Proceedings of the 24th annual ACM symposium on User interface software and technology, стр. 257--262. New York, NY, USA, ACM, (2011)