Quote:
Originally Posted by Agama
This is a very sensible value to use and ensures that letters with "descenders", (g p q y), don't bump into tall letters on the next line.
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Unfortunately, that's very much font-dependent (meaning that for some fonts 1.2 will be "too much" and for others it will be "not enough"). It depends on how the different glyphs (letters) are drawn in the containing block. Some fonts have containing block very well adjusted to the glyph shapes, some fonts have lots of white space in the containing block, some fonts have large parts of the glyphs outside the containing block... There's no fixed solution for every font.
(see Figure 5-9
here)