Most OS X apps have a small Fonts window that pops up if you want to change your font’s options. It’s not a new feature, been around as long as Snow Leopard (10.6) as far as I can tell, you can preview the look of the font right there in the window.
When you open up the font window, you should see a small dot under the title bar. Click it, drag it down, and you’ll get a full preview of whatever font you’ve chosen, complete with the size, typeface, and other settings you’ve chosen.
Winged Boar Pub 
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