[mediaqueries-5] How does script control of preferences work with forced color schemes?

[lukewarlow]

Currently you can set a color scheme on your site, which allows you to specify which colour schemes you support.

Some browsers allow the user to force a specific color scheme on a site even if it only supports light mode by default.

This can be disabled by using the light only value for the color-scheme property or meta tag.

What behaviour should preference overrides have? light - where the browser force dark mode wins, or light only where the users choice for the site overrides the browsers force dark mode?

[lukewarlow]

Currently the Chromium prototype just sets the value rather than forcing it to only such that force dark mode does win over the site preference override. I think this is wrong, and the site override should win. However, I'd be very interested to hear the views of the wider group.