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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.
Before the advent of CSS, the display width of an image was controlled by the width attribute. This usage has been deprecated. In the absence of any CSS rules defining the display width of the image, it will still work in most browsers. However, this is specifically contrary to the HTML5 specification. <!-- This works, but you shouldn't do it. --> <img src=/wp-content/uploads/very-large-flamingo.jpg width=500>.