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The short answer is that you can.
The slightly longer answer is that you can’t, at least not in any meaningful way yet.
The long answer is that the ability to download fonts has actually been a part of the CSS standard (the language used to create Web designs) for over 10 years. The snag comes with what font formats a given browser supports.
[NOTE: You may want to stop reading now, as the rest of this explanation might make your eyes bleed in frustration.]