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http://dev.w3.org/csswg/mediaqueries4/#resolution should specify page zoom and pinch zoom. It should work along the lines of devicePixelRatio, http://dev.w3.org/csswg/cssom-view/#dom-window-devicepixelratio See the thread starting at http://lists.w3.org/Archives/Public/www-style/2012Nov/0144.html
Done.