Questions regardarding user experience implications of font sizes.
Font size is traditionally measured in points, but other units, such as pixels, ems or other length units can be used in some contexts. Choosing appropriate font sizes is part of typesetting and affects readability and usability of interfaces and text.
The same font size can visually vary for different typefaces due to inconsistencies in defining font size.
Questions with this tag deal with problems regarding font size and line height (also called leading) to the extent in which they affect user experience.
Further reading:
