I am under the impression that it doesn't matter whether to use 1.2 em or 120%, they would both display the same. I don't see how using percentage would give any greater control to the "end-user" than using ems.
I started using percentage for font-size as an experiment, but will go back to using em. I find that I prefer to use percentages only when referring to MARGINS and LINE-HEIGHT (easier Find&Replace in the stylesheet)
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