[Webkit-unassigned] [Bug 225281] New: Implement forced-colors media query

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225281

            Bug ID: 225281
           Summary: Implement forced-colors media query
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ntim at apple.com

forced-colors mode is a Windows only accessibility feature, Firefox does allow you to force enable it on other platforms, but for by default it's also mostly for Windows (it's enabled with Windows High contrast mode).

For reference, it forces colors on a webpage to be contrasting, by changing them without the webpage's consent.

Since iOS/macOS has no such thing, so it's reasonable to implement a placeholder where: (forced-colors) or (forced-colors: active) return false and (forced-colors: none) returns true. 

That will allow webpages to use it (since Firefox & Chromium support it), and expect correct results on WebKit.

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