Re: font sizes in ems

Douglas Rand writes:

 > > The default size, the 100% size, and the 1em size should be the same,
 > > but they are not.
 > Why is this true?  An em-space isn't necessarily the same as the font
 > height.

In CSS1 it is. This is arguably underspecified, but section 6.1 reads:

  "ems, the height of the element's font"

This usage of the term "em" is supported by [1] which reads:

  Em: In current usage, a unit of measurement that equals the point
  size of the type.

[1] Glossary of typesetting terms, University of Chicago Press, 1994



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