What technology is used on www.taasky.com?

Question

Animation

Scroll through the site to the Taasks have never been so fun block.
Click under the button.
A ball will appear that will fall on the triangle and roll along its inclined edge.
Very realistic physics.
Question:
how is it done? What libraries are used?
How is such SMOOTH animation achieved?

Answer 1

https://github.com/bebraw/jswiki/wiki/Physics-libraries
Specifically on taasky.com box2dweb is used