[Webkit-unassigned] [Bug 241433] New: Make CSS custom properties that are IACVT guaranteed-invalid

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=241433

            Bug ID: 241433
           Summary: Make CSS custom properties that are IACVT
                    guaranteed-invalid
           Product: WebKit
           Version: Safari 15
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: xiaozj at gmail.com

Same as this Firefox bug: https://phabricator.services.mozilla.com/D116460

Also codepen demo: https://codepen.io/Miragecraft/pen/XWaLxNb

In short, when assigning an invalid CSS custom property to another custom property, it makes the final value unset (which means "inherit" for custom properties) instead of initial.

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