Vanilla JS, CSS, Velocity, and Web Animations API are not working for me. Greeksock didn't work at first but enough clicks later it worked. Sometimes I'd see t

Vanilla JS, CSS, Velocity, and Web Animations API are not working for me. Greeksock didn't work at first but enough clicks later it worked. Sometimes I'd see the ball for a few frames at the top of its drop before nothing. Firefox 45.0.2 on Ubuntu 16.04. Otherwise looks good!