AD JOKE ALERT! What did one .em say to the other .em? Who's your Daddy? Wince all you like now, but hold it to heart when you venture into the realm of .em's! Most of the confusion and difficulties when first using "em" results when the declared "font-size" of the parent element is overlooked. Used correctly, the .em is an ideal font-size unit of measure. Pixel units are relative to the resolution of the viewing device, i.e., most often a computer display. If the pixel density of the output device is very different from that of a typical computer display, the user agent should rescale pixel values. It is recommended that the reference pixel be the visual angle of one pixel on a device with a pixel density of 96dpi and a distance from the reader of an arm's length. For a nominal arm's length of 28 inches, the visual angle is therefore about 0.0213 degrees. A single pixel viewed in that reference frame would approximate 0.26mm in length. Pixel units are relative to the resolution of the viewing device... With this in mind, .px may be the most portable unit of measure across devices. Absolute length units are only useful when the physical properties of the output medium are known. The absolute units are:
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