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Dark mode’s bright future: How dark mode will transform Wikipedia’s accessibility
(diff.wikimedia.org)
This is a most excellent place for technology news and articles.
It does look like you currently need to be logged in to set the setting or set it each time (or, I assume, have your browser retain persistent cookies); the default is light. It'd be kind of nice if it just used the browser "light" or "dark" preference.
Maybe this is just temporary; they do say that the dark mode is "beta".