Quote:
Originally Posted by Jellby
Or you could use percents: nothing for the body, 115% or 120% for the titles, 60% for the colophon.
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I have found that 1em is better than nothing, particularly when the font size changes within a paragraph using a span. Having a defined size is better than the default which can be a default inherit depending on the reader resulting in the size remaining changed after the span is done until the paragraph end. I have adopted 1em for that reason if there is a need for any changes to the default size. Of course defaults for h2, h1, h3 etc. are change sizes already as they have different defaults.