Forum Moderators: not2easy
What is a good font size ?None. There is absolutely no reason on earth to specify a point size, and plenty of reasons not to. For the assorted headers--and for the rare material that should be smaller-than-default, like sidebars--use percentages.
You can avoid specifying pixel (or em) sizes and use relative sizes such as small, medium, large, x-small, x-large to leverage browser defaults.
I use % for font sizes, which i've always assumed is similar. ... eg. 80% 120% 200% etc etcThe difference is that percentages are relative to what’s around them. 75% within 16pt text is 12pt; 75% within a 36pt header is 27pt and so on. But you can be certain that it’s always going to be the proportion you specify.
i don't think the choice of font is any better than the defaults available to most users on their deviceDitto, ditto, ditto. What is so special about ObscureFontName.ttf that outweighs the extra time required by a visit to Google Font Repository? (There is a place for named specialty fonts--I have to say this, because I use a very few myself--but they need to be genuinely specialized, and they need to be hosted on your own site.)