re relative font sizes - x-height

I should have added that this is a useful measure for determining font size
when you have a font that is either inordinately large or small in the
x-height ­ a small x-height font can look a bit tiny at the same size as
a perfectly legible average x-height.  This doesn¹t apply much, however, to
the more usual webby fonts, which tend to have quite big x-heights.

Julia

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