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With this set, an image meant to be 5 inches wide at 300dpi will actually display as 5in wide; without this set, the image would display as approximately 15.6in wide since the image is 15000 image pixels across, and by default CSS displays 96 image pixels per inch.
The <color> CSS data type represents a color in the sRGB color space. A color can be described in any of the following ways: using a keyword. using the RGB cubic-coordinate system (via the #-hexadecimal or the rgb() and rgba() functional notations)