Font size in CSS - % or em? -

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when setting size of fonts in css, should using percent value (%) or em? can explain advantage?

there's article on web typography on a list apart.

their conclusion:

sizing text , line-height in ems, percentage specified on body (and optional caveat safari 2), shown provide accurate, resizable text across browsers in common use today. technique can put in kit bag , use best practice sizing text in css satisfies both designers , readers.


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