Contrainst on location of @font-size

Where can/can't an @font-size declaration occur?

If inside an @media is it local to that media?
If outside an @media is it available to all @media?
Do @font-face have to occur first in the style sheet?

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| Mortar: Advanced Web Development <http://mortar.bigpic.com/>
| Neil St.Laurent                  <mailto:stlaurent@bigpic.com>
| Big Picture Multimedia