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EMs and EXs

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From: Dagmar Noll
Date: Dec 1, 2004 7:11AM

Hi! This is my first posting to this list. I've been reading for a few
months, however.

My question is about relative units. I've done a lot of reading on EM vs.
Pixel, but lately I've been seeing references here and there to the EX unit,
but not enough to determine if there is any browser support of this unit,
what, exactly, it is (I did read the W3C spec, but their explanations
usually elude me), and if it helps make pages that are more or less flexible
than an EM-based page would be.

Has anyone else explored EXs?

Dagmar