PostScript does more than markup and presentation; it is an entire 2D graphics engine. At one point PostScript served as the graphics substrate for the Sun NeW

PostScript does more than markup and presentation; it is an entire 2D graphics engine. At one point PostScript served as the graphics substrate for the Sun NeWS and NeXT Display PostScript-based window systems. While I agree from a security standpoint that its Turing-completeness poses challenges, it also makes it easier to express certain constructs such as complex shapes and fonts programmatically. I’m not a PostScript expert but I’ve been reading a lot about it recently. It’s a rather fascinating system for 2D graphics.