A straightforward compile of vim using emscripten doesn't work, because the I/O just doesn't work right (blocking I/O, for one thing). Emscripten works "out of the box" mostly on computation-heavy rather than interaction-heavy code.
Didn't downvote you but since you seem to wonder about the downvotes I think they came because you jumped in in a negative way (and was wrong). I'd say that the downvotes were kind of justified here, - I want HN to be positive to creators unless they are wrong/evil.
