Should this support forced-colors?

[lukewarlow]

Currently this API specifically doesn't allow 'custom' for contrast preferences because it's so tightly coupled to forced-colors.

Alternatively should this API allow opting in to forced-colors?

1. Is this really necessary? Probably not?
2. By default it would fallback to the browser default system colors. Is this enough? Would developers want to customise them?
3. As mentioned forced-colors currently also updates prefers-contrast to either more, less or custom. What behaviour would be desired when the override is set?

[lukewarlow]

w3c/csswg-drafts#9660 - if custom colours schemes come to pass that provides a mechanism to override system colours. With that in mind the ability to set forced colours to active wouldn't seem completely useless?

If you're not on Windows and you're not a Firefox desktop user you don't currently have a forced colours mode, this could allow sites to implement their own?