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I'm making tentative steps towards designing my first typeface and I've been thinking about vertical metrics.
What should be accounted for within the height of the em square? My instinct is that it would be a tidy solution to allow space for the height of diacritical marks within the em to avoid clipping / crashing, but I can see a number of disadvantages too.
I remember a thread which compared the 'size on the body' of recent Microsoft type families to that of older ones such as Arial, and found the new releases were significantly 'smaller on the body'. Has there been a move in this direction for other designers / foundries, or is it one of those personal preferences which splits opinion?