CSS Responsive Font Sizing

When creating a responsive website, what is the best approach for sizing fonts?
Pixels, % percent, EMs or REMs.
A good example?
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Kyle AbrahamsSenior .Net DeveloperCommented:
You use @media screen for the different size screens.

Percentage and Ems are pretty much equivalent . . . but I would stick with one of those (EG: 100% = 1EM, 200% = 2EM, etc).

Here's a good article explaining it in further detail:
Alexandre SimõesManager / Technology SpecialistCommented:
The main difference is in with rem.
While em is a percentage of the parent font-size, rem goes straight to the top and does the same but with the html element font size.

Using percentage is the same as em.

Here's an example I've baked for you

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