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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.
And you can position your background image with the background-position property. And CSS3 adds more styles for your backgrounds as well. You can stretch your images to fit any size background or set the background image to scale with the window size. You can change the position and then clip the background image.