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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 <image> CSS data type represents a 2D image. There are two kinds of images in CSS: plain static images, often referenced using a URL, and dynamically-generated images like gradients or representations of parts of the tree. CSS can handle different kinds of images: 1  images with intrinsic dimensions, that is a natural size, like a jpeg image which has a fixed dimensions.  images with several intrinsic dimensions, that exist in several versions inside a file, like some .ico formats.