after reading the typekit blog for awhile i thought i figured out the answer. i tried putting .wf-inactive h1 in my css and setting the font-size smaller, but that did nothing.
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However, that doesn’t specifically tell you if the custom font was actually downloaded successfully, or if it is actually being rendered.
Webfont Loader would seem to be the better solution (I’ve never used it, but my understanding is that you would set your fallback font and size by default, and then use the callback function to change it once the custom font has been loaded).