Mou is really annoying in the way it handles history. I guess it's author never heard of the command pattern, because Undo-ing the history doesn't consider the autocompletions Mou did and just generally doesn't work and mess up your document. Then Redo-ing helps cementing the mess.

Also the editor is very lacking in functionality, in term of text manipulation.

I started by liking Mou, then working around the issues, then getting pretty angry at it from all the time I wasted trying to make it work - all that just to get a live editor. Ended up setting a Grunt task.

I've reported those problems to the author who didn't seem to give a damn.