[Webkit-unassigned] [Bug 279740] New: "inherit" as variable substitution fallback not working when setting custom property

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=279740

            Bug ID: 279740
           Summary: "inherit" as variable substitution fallback not
                    working when setting custom property
           Product: WebKit
           Version: Safari 17
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jeffery.to at gmail.com
                CC: koivisto at iki.fi

Created attachment 472568

  --> https://bugs.webkit.org/attachment.cgi?id=472568&action=review

Test case

When a custom property is set like:

    --color: var(--unknown, inherit);

the custom property does not inherit the correct value.


Steps to reproduce:
1. Open attached test case.

Expected result:
A 10px green border is shown.

Actual result:
A 10px border with the default colour is shown.

Tested with:
* Safari 17.6 (19618.3.11.11.5) on macOS Sonoma 14.6.1 (MacBook Pro 16-inch, M3 Max)
* Safari on iOS 17.6.1 (iPhone 15)
* Safari on iPadOS 17.6.1 (iPad Pro 13-inch, M4)
* Epiphany 46.0 on Ubuntu 24.04 (libwebkitgtk 2.44.3)

Works on Chrome and Firefox.

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