[mediaqueries-5] prefers-contrast: high media feature does not accurately describe the macOS/iOS state

https://drafts.csswg.org/mediaqueries-5/#prefers-contrast

Unlike Microsoft's "high contrast" mode, the "Increased Contrast" settings on macOS and iOS do not result in "high" contrast, but an intermediate "increased" value. It's possible that a future update to these and other systems would allow a user-end "high" contrast value in addition to the current implementation of "increased" contrast.

The media feature should account for values other than "high" and "low." Ideally there'd be a shorthand way to match both the macOS/iOS value, or the extreme end value used by Microsoft.