physics-visual | Visualization/Simulation of 2D physics concepts | Animation library

I working on a website that is made up of circular divs that are in constant motion. The divs eventually collide with one another and the walls. I have done tons of research and the best solution is to use momentum which works depending on mass and velocity. This link shows a perfect example of what I plan on making but the problem is that the colliding objects are 2D shapes in a canvas element. So is there a way of giving a div MASS and VELOCITY using HTML and vanilla JavaScript? If yes, how can I implement it? Thankyou.