The responsive bit doesn't really work though. The mobile version does, but there doesn't seem to be any good reason for that being extra functionality, rather than it just being how the site should reflow at smaller sizes
Haha that's an ironic URL. Clearly I was wrong about Wikipedia's use of media queries, but that makes the persistence of the ".m." subdomain even stranger. It's time to start 301'ing this.
Info on what response design is on Wikipedia: https://en.m.wikipedia.org/wiki/Responsive_web_design