The website isn't supposing anything. The browser is supposing that you want the dark version of the website because you are in the system dark mode. Why shoul

The website isn't supposing anything. The browser is supposing that you want the dark version of the website because you are in the system dark mode. Why should this be different from say view scale? Should a website override the user's zoom level and render tiny fonts because it wants to? It doesn't, because the browser tells it what scale to use. Same with light/dark modes. Your issue is that your browser doesn't let you configure this one setting, not that every single website on the entire internet doesn't implement what you want.