Pixels are meaningless unless you're an artist, especially with modern graphics APIs where it's often difficult to actually draw individual pixels. IMO: everyo

Pixels are meaningless unless you're an artist, especially with modern graphics APIs where it's often difficult to actually draw individual pixels. IMO: everyone who's used font size outside college knows what an em is. Just standardize a point size in terms of a physical measurement (maybe stick with 1/72 inches since everyone except Microsoft apparently uses that) and make the "font size" a coefficient that maps ems to inches. Furthermore: cap height doesn't capture as much as an em does: there's spacing between letters which has little to do with cap height. Everything about this is wrong.