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http://dev.w3.org/csswg/cssom-view/#extensions-to-the-window-interface [[ Let device pixel size be the size of a device pixel of the output device, in one dimension (vertical or horizontal). If the device pixel is not square, then use the smaller of the vertical or horizontal size of the smallest bounding box of the device pixel. ]] "RESOLVED: 'resolution' MQ uses the vertical resolution when pixels are not square" http://krijnhoetmer.nl/irc-logs/css/20140908#l-863
https://dvcs.w3.org/hg/csswg/rev/7af8815c92ec