For those copy-pasting on a mobile site or tablet (I didn’t use any libraries, it should run on pretty much anything), it’s www.hunterdavis.com/asljs/
This is the sort of thing I think we should all take more time to actively do. Just write some code for the heck of it, and get it out there to share. Even if it’s a little thing. Especially if it’s a little thing! You never know what will come of it, and it’s a great way to get ideas out there.