[Bug 3512] Implement font-stretch property

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--- Comment #49 from John Daggett (:jtd)   2008-06-04 18:57:30 PDT ---
(In reply to comment #48)

Hmmm, what spec defines this?  Are you using the wording for font-weight from
the 2.1 spec to infer how font-stretch works?

I would argue that for your example a and c should render the same no matter
what font faces were available.  I could definitely see how one might interpret
the 2.1 font-weight description to infer the behavior in your example.  Damn
spec writers. ;)