On Thu, 18 Apr 2013, COM wrote:

My understanding of font-size spec is: 100% = 1 em = the size of an
"M" and that this is 16px high.

  100% is the user's default font size. It could be anything from 12px
  to 24 px (or larger or smaller) and should be used for any body text
  on the page.

What I am not clear is: where do you tell the browser how large the
"M" is? Is it universally understood that 1 "M" is 16 pixels high?

  1em is the current font-size.

--
   Chris F.A. Johnson, <http://cfajohnson.com/>
   Author:
   Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress)
   Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
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