a tic-tac-toe game using only JavaScript and CSS
uses minimal code that you can see here: https://github.com/jennyknuth/tic-tac-toe/blob/master/app.js
Try it live here: http://jennyknuth.github.io/tic-tac-toe/
similar in design and style to my minimal ping-pong score keeper using AngularJS: https://github.com/jennyknuth/ping-pong