For writers, that is a good idea (although I think there are a few things missing from most implementations, such as foot notes, and a table of contents window; I do have the idea of a "feature" attribute to handle such things, but it is not implemented either (although using it is harmless, since unrecognized attributes in HTML will be ignored)). CSS should mostly be not needed.
For readers, it will be necessary to fix the implementation to do the working better, since not everyone will write it properly.
