|em||1em is equal to the current font size. 2em means 2 times the size of the current font. E.g., if an element is displayed with a font of 12 pt, then '2em' is 24 pt. The 'em' is a very useful unit in CSS, since it can adapt automatically to the font that the reader uses|
|ex||one ex is the x-height of a font (x-height is usually about half the font-size)|
|pt||point (1 pt is the same as 1/72 inch)|
|pc||pica (1 pc is the same as 12 points)|
|px||pixels (a dot on the computer screen)|
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