paulirish/html5-boilerplate — comment on commit 125a7a6840aff6d32ae03d200713bdfc942b45f2
File:  line 0
By necolas:

the browser defaults are a good enough default, until you set your own specific values.
you can see some of the discussions that went on in the issue itself: #724

> isn't this a hack to get font-sizes to display nicely cross-browser?

nope. any values will work here.