DerbyJS (http://derbyjs.com/ http://derbyjs.com/) is built specifically for these principles. I'm working on big updates to the documentation right now, but I c

DerbyJS (http://derbyjs.com/ http://derbyjs.com/) is built specifically for these principles. I'm working on big updates to the documentation right now, but I can say that we have a great solution for Server HTML + Client DOM rendering, realtime data updates, and immediate optimistic updates on user interaction in the client. By building on ShareJS, DerbyJS uses Operational Transformation for collaborative editing of data in realtime, which means that users can see data updated immediately in their browser even if other users can edit the same thing at the same time. This is the same approached used by Google Docs.