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As a point of interest, 8px is the smallest font size that offers enough pixels to display mixed case text (which needs ascenders and descenders.) ...As a general rule, I've found that when you make the font size larger (say at least 12px) you can watch your stats go up.
Don't most people have their browsers settings set to override the code-specified font size and show their preferred size instead?
i've always heard the rule of thumb for font size was 1/3 the age of your intended audience.
What some some designers do not get is that a good percentage of the population has a color vision deficiency (color blind). I think it is like 8 per cent of males worldwide.
It's a usability issue. 9px is ridiculously tiny, IMO.
[edited by: lucy24 at 9:18 pm (utc) on Jul 2, 2013]
I've got everything at around 13 or 14 size, mostly Verdana. My only concern is that it might look too big on an iPhone or other small mobile phone. Otherwise, I think bigger is better.