@bramus Yeah, I read that. But I'm coming to different conclusions: Darkmode toggles on websites are a mistake to begin with. They mainly serve to advertise: "We have a darkmode!"
But the switch should still happen on OS level, for the reasons I mentioned (ambience light as a deciding factor). BTW you give no reason why the toggle should not be in the OS but in the browser instead. The only reason I see is that OS manufacturers currently don't give darkmode toggle the prominence it deserves.