What is the best value for font size and line height where readability is concerned?
I myself prefer huge font size and greater line height like the one used in Dive into Python 3.
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As with every other “what’s the best” question in the world, the answer to this is “there is no ‘best'” 🙂
For font-size, arguably the ‘best’ is whatever the user has chosen themselves, either as the default or the minimum. In other words, leave the font size alone for main body copy, and only increase it for headings. You might consider decreasing it by a very small amount for non-critical content. 16px is generally the browser default.
For line-height, values between 1.3 and 1.5 are typically recommended for good readability, although this varies with font face and line length.