Yep. I think by the time the web arrived, it was pretty common for the windowing systems (e.g., Windows, Mac System whatever, OpenVue, Next, etc.) to have black

Yep. I think by the time the web arrived, it was pretty common for the windowing systems (e.g., Windows, Mac System whatever, OpenVue, Next, etc.) to have black text on white backgrounds to mimic paper output.