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AFAICT, a '%' added after a font-size property is ignored. Being able to specify relative font sizes will provide greater flexibility and fidelity with the desktop environment (especially in conjunction with Bug 373015). More generally, being able to specify absolute (e.g. 'small', 'medium', 'large') or relative (e.g. 'smaller', 'larger') would be useful. http://www.w3.org/TR/CSS2/fonts.html#propdef-font-size