Web Wish 9: Used Color Scheme Media Query

Currently, you can use prefers-color-scheme in the media attribute of a <source> to provide video or images that matches the users preferred color scheme.

However, this might not actually match the used color scheme, as a different color scheme can be set in either <meta name=color-scheme> or by setting the color-scheme property.

I need a way to provide image and video sources that match the used color scheme and not just the preferred one. I've written extensively about it in The Case for a Used-Color-Scheme Media Feature

This holiday I'm wishing for a way to provide light and dark mode image sources, so they can match the used color scheme.

Relevant issues and PRs: