deviceNormalPixelRatio (zoom-independent devicePixelRatio) proposal

Hello, I'd like to propose an addition of deviceNormalPixelRatio variable
and media query as a zoom- and viewport-scale-independent version of
devicePixelRatio. The idea is to allow manual scaling of certain elements
with meta viewport scale set to 1 (for instance, to make canvas be drawn in
HD). More info:
http://www.w3.org/community/respimg/2013/04/06/devicenormalpixelratio-proposal-for-zoom-independent-devicepixelratio-for-hd-retina-games/What
do you think?