Gee, did I specify just type-editing? No, I did not. Anything where “it just works” but “I’ll be d**ned if I know how it did that” fits under the general rubric of WYSIWYG. Second, you’re right, I over-specified OS types - my bad - Apple’s OS no longer qualifies as a transparent, or even translucent, OS. So, let’s try a narrower class: *nix - (Apple OSes).
Excuse me... but that is WYSIWYG is all about... that what you see on the screen is what you will get on the printed page. And I disagree about Apple no longer qualifies as transparent. If you know what you are doing, you can still control everything about it. It IS UNIX.