[MayeulC]

DPI is one of my pet peeves, together with points. Why not use mm for font size?

Instead of DPI, one could use µm per px, or px per (c)m if you want something easier to work with at very high DPI.

I know what DPI and points are, but just because I know a few values and can say "that one's large", "this one is small", with no idea how much they act iually measure. With other units I could approximate the viewing distance much better.

[pessimizer]

> DPI is one of my pet peeves, together with points. Why not use mm for font size?

Easy halving, the same reason why A4 has been extolled.

[Symbiote]

Defining 1mpt = 0.1mm would be just as good.

Normal text would be 40mpt = 4mm = 11.33pt.

But there are already metric point definitions: https://en.wikipedia.org/wiki/Point_(typography)