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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.
CSS Units. CSS has several different units for expressing a length. Many CSS properties take length values, such as width, margin, padding, font-size, border-width, etc. Length is a number followed by a length unit, such as 10px, 2em, etc. A whitespace cannot appear between the number and the unit. However, if the value is 0, the unit can be omitted.