css3-mediaqueries now says that the dpi, dpcm (and future dppx) units are dots per *CSS* inch, not dots per physical inch.
Created attachment 639532 [details] [diff] [review] patch
Created attachment 639542 [details] [diff] [review] patch with more tests
Basically passed try (though a few Windows tests still pending): try: --build d --platform linux,macosx64,win32,android --unittests all --talos none --no-emails https://tbpl.mozilla.org/?tree=Try&rev=afa60b026c46
Comment on attachment 639542 [details] [diff] [review] patch r=me
Added a line in https://developer-new.mozilla.org/en-US/docs/CSS/resolution and in https://developer-new.mozilla.org/en-US/docs/Firefox_16_for_developers (Visible on the real site when Kuma will come live!)