What is the definition of font size?
I tried to search the Internet for a definition but I didn't find much. So, what is the definition of font size? For instance, what makes a 10 pixel font a 10 pixel font?
Think of it as the maximum height of a line of text. Glyphs may not be as big as the maximum height, so yeah ... some 10px fonts are not real 10px but 9px or 8px.