It had been a few years since I I had looked at the possibilities, so I did a little digging on JS animation.
Following my notes and links.
The Smashing magazine article was good as were a couple tutorials. I am interested in the libraries; Web Animations API, Velocity.js, Greensock.com and Processing.js (note Khanacademy.org class). The animation editors look to have reached maturity I am hopeful for the Google Web Designer Beta and hope that it is easy to use the exportable code for animations as modules within larger development.