Dark Mode support?

Is support planned for CSS media queries, namely dark mode? https://drafts.csswg.org/mediaqueries-5/#prefers-color-scheme is the specification, and https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme has some nice examples (although ironically doesn’t actually support it themselves).

Phabricator already supports a dark mode (Settings > Display Preferences > Accessibility > Dark Mode) but it doesn’t work very well. There’s very little customer interest in this mode, it doesn’t work well now, it’s a relatively high-cost feature to maintain, so it’s likely that it will be removed in a future version of the software.