> "glyphs are exactly 1/2em wide"
The M is 1/2 of an M wide?
Yes. That is, for a given x-height, the width of an 'M' half of what it "should" be for that x-height. According to this:
https://en.wikipedia.org/wiki/Em_(typography)
it seems the width of an M should be exactly equal to the x-height in points (IIUC).
Yes. That is, for a given x-height, the width of an 'M' half of what it "should" be for that x-height. According to this:
https://en.wikipedia.org/wiki/Em_(typography)
it seems the width of an M should be exactly equal to the x-height in points (IIUC).