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This div's class has a font-size property defined in pixels.
This div's class has a font-size property defined in points (pt).
This div's class has a font-size property defined in 'em'
This div's class has a font-size property defined as a percentage of its parent element.
This div's class does not have a font-size defined.
sacado de http://www.shopdev.co.uk/blog/font-resize.html
