As it's being requested very often we'd like to provide the dark mode for our system and components. For the start this might be quite rudimentary, as it has even also been defined / designed for some components at all.

Additionally we should make this an opt-in decision by the existing websites using our code - instead of setting our two options via CSS, we should aim for the websites to set the declaration via HTML attributes, compare to
https://css-tricks.com/a-complete-guide-to-dark-mode-on-the-web/#aa-handling-user-agent-styles