Unit Definition (em) The em is a printer's unit of relative distance. One em is the height of the type size (in points) being used. If 12 point type is being set, then one em is 12 points, and so on.
Unit Definition (span) Span is the width of a human hand, from the tip of the thumb to the tip of the pinky finger.
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Length/Distance 
Convert from em to span
