HTML is just a markup language, PS is a programming one, NeWS [1] was an X11-alike server PS-based, SUN Pizza Tool a nice demo [2] oh, sure in term of ease of use is a bit awful to write and read, but still it's a "graphics oriented programming language" while HTML just target crafting clickable text with limited extras.

[1] https://en.wikipedia.org/wiki/NeWS

[2] https://donhopkins.medium.com/the-story-of-sun-microsystems-...

Interesting. So NeWS was like display postscript? Which I think was also used in NeXT OS.