Why Bother with Relative Font Sizes?
Some 8-9 years ago when I started knocking up pages in my Geocities page builder, I specified 8pt Verdana and considered myself ahead of the curve because my site text was bigger than most at the time. A couple of years later (or thereabouts) I learned that pt was bad — pt, or 'point', is a print measurement not intended for screen — and moved to 11px. Same size, but 'more correct'.
A few years passed, and I involved myself in accessible design. Catering to the visitor's many needs was suddenly at the forefront of everyone's mind and so I swapped from px to em and/or % measurements; instead of 8pt or 11px Verdana, I gave you 72%. My text — the text that you're reading now — became your text.
Of course, therein lies a small problem. I make the effort but you (generalisation), as readers, don't. I provide you with the facility to resize my text to suit your individual needs and instead, you complain that it's too small, or the opposite (on 'big' designs).. you complain it's too large. So why do I bother? After all, even if I changed it to suit one hypothetical person's wants, it wouldn't align with those of another.
So, do yourself (and me) a favour: learn to use your browsers text resize facility to make the text look how you want it to look. I don't just use relative font sizes for the crack of it, you know.
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