Ask HN: What are some of the coolest demonstrations of JavaScript on the web?

[aaronjgreenberg]

Just looking for some examples of really cool uses of JavaScript---games, visualizations, art, interactions, whatever. The examples can be bleeding edge or not; I'm looking for anything.

[dyukqu]

https://www.chromeexperiments.com

[jmstfv]

I love this one: http://david.li/paint/