You may want to animate a value manually, without generating any CSS.
This module is for you!
You'll need to track a Timeline in your model and update it using Browser.Events.onAnimationFrame.
Units per second: if your values are pixels, this returns pixels per second.
The interpolated position and velocity (in value units per second). Completed transitions hold their destination with zero velocity. Interrupted transitions contribute their position and velocity at the interruption time.