This is a Pong game made in ReactJS. All the elements are simply DOM elements that are manipulated via event handlers and methods. Every moving element is handled through calling React setState at roughly 60 times per second and then simply allowing Reacts renderer to redraw. The collision detection code came from another project of mine Deathbot. This was done simply as an experiment to see if I could make a playable game using the DOM and React. Please don't make games this way.
Source code for Rong can be found on my GitHub Page