RT Thomas Steiner
.@quicksave2k has landed an implementation of Sec-CH-Prefers-Color-Scheme in Chrome Canary ≥92.0.4514.0. We've put a demo online that showcases the use case we want to enable. The explainer includes screenshots of its output:
Chrome Developers:  We're working on `Sec-CH-*` Client Hint headers modeled after User Preference Media Features (
Explainer
Spec draft
(via @tomayac)
https://drafts.csswg.org/mediaqueries-5/#mf-user-preferences
https://github.com/tomayac/user-preference-media-features-headers/blob/main/README.md
https://tomayac.github.io/user-preference-media-features-headers/

https://twitter.com/tomayac/status/1395700542794502147