Sounds like good news, and similar to how Emacs handles it; do newer versions of web browsers also change the base/default colours when dark mode is used, by the way?<p>Still not a complete replacement of global colour overriding (white flashes, or simply switching between dark and light themes often, can be quite unpleasant in a dark environment, and of course all the websites won't ever employ it, and some will use it wrong), but at least from the webmaster side it should simplify the colour theme decisions quite a bit (which were/are hard if you care about that sort of thing: I hoped that major web browsers will do something like that with alternate stylesheets someday, but as a media feature it would work too).