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6c9524b687
Also fixes calculation of background-position percentages: Rather than multiplying the container size by a percent and aligning the top left of the image at the resulting width, we also need to subtract a corresponding percent of the image size, per http://dev.w3.org/csswg/css2/colors.html#propdef-background-position "A value pair of '100% 100%' places the lower right corner of the image in the lower right corner of the padding box. With a value pair of '14% 84%', the point 14% across and 84% down the image is to be placed at the point 14% across and 84% down the padding box."