[Webkit-unassigned] [Bug 243665] New: CSS `color-scheme` can't be assigned via CSS variable

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243665

            Bug ID: 243665
           Summary: CSS `color-scheme` can't be assigned via CSS variable
           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: tomac at google.com

Created attachment 461482

  --> https://bugs.webkit.org/attachment.cgi?id=461482&action=review

Correct behavior in Chrome

It's impossible in Safari to make the following CSS work:

```css
:root {
  --color-scheme: dark light;
  color-scheme: var(--color-scheme);
}
```

Go to https://aboard-bustling-bit.glitch.me/ in Safari and inspect the `<input>` with the value "Just a test". Note how the computed style for the `color-scheme` is always `auto`. Run the same test in Chrome and see how it reflects what is set via `var(--color-scheme)`.

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