Having an HTML5 client built-in doesn't mean that it's "clientless" but it's still impressive. MIT license doesn't hurt, too.
Except a browser compatible with HTML5-august-2014-revision. Believe it or not, there are many places stuck in pre-HTML5 times (hotel computers, for example).
If it could stream GIFs and accept clicks with server-side image maps, then it would be compatible with every desktop graphical browser in existence (Opera Mini and text browser would still be not enough).
I can't decide if that's the most brilliant idea I've ever heard or the most terrifying. Probably both.