No browser stuff and Node.js is running in an isolated process. CSS is simply the "language" in which you define the looks of the editor and has nothing to do with web browsers or html.
And this rasmusfabbe is developping Kod: - http://www.youtube.com/watch?v=jHUp3sdKYJw (a cool idea on grouping documents by Levenstein distance)
I do wish people would get used to (dis)claiming when they have a stake in some product they comment on.