Font size in CSS – % or em? [duplicate]

There’s a really good article on web typography on A List Apart.

Their conclusion:

Sizing text and line-height in ems,
with a percentage specified on the
body (and an optional caveat for
Safari 2), was shown to provide
accurate, resizable text across all
browsers in common use today. This is
a technique you can put in your kit
bag and use as a best practice for
sizing text in CSS that satisfies both
designers and readers.

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