On Apr 18, 2013, at 3:07 PM, "Jukka K. Korpela" <jkorp...@cs.tut.fi> wrote:

>> What I am not clear is: where do you tell the browser how large the "M" is?
> 
> You don't. The font designer decides the dimensions of letters, relative to 
> the font size.

OK…so the 1em is just a starting point and you adjust to suit..or these are all 
*relative* sizes because in the child elements you might spec font-size: .85em ?

..so that if User cranks up the sizes, everything sizes up (or down) in the 
same relationship?

J
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