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http://dev.w3.org/csswg/cssom-view/#extensions-to-the-window-interface Should define devicePixelRatio.
https://dvcs.w3.org/hg/csswg/diff/3f1134d3661e/cssom-view/Overview.src.html
https://code.google.com/p/chromium/issues/detail?id=177836
https://dvcs.w3.org/hg/csswg/rev/f4764399a74c