"Statecharts in User Interfaces: Warding Off Complexity", Erik Mogensen, RESTFest 2014. https://vimeo.com/109808288

It is. If you're a front-end web dev, check out SproutCore. It has a built in statecharts library acting as the Controller in MVC apps.

http://restfest.github.io/2014-Greenville/demos/mooooogle/ A web UI using a state chart to model (and execute) its state.