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If you install https://chrome.google.com/webstore/detail/dark-reader/eimadp... you get dark mode functionality on any site automatically, no need to create a different website for it. It also has color preferences (hue, contrast, brightness, sepia).

I would prefer if websites would make use of the prefers-colour-scheme rather than having to waste memory/CPU/time by using some of these addons.

For something like this, it should be trivial to do.

On the other hand, why does every website have to do something when you can do it yourself with an extension if it's something you want.

This is the beauty of the web browser. I don't even get a choice in how things are displayed in native apps.