[Webkit-unassigned] [Bug 150406] New: Generate warning for inspector when there are cyclic custom properties

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=150406

            Bug ID: 150406
           Summary: Generate warning for inspector when there are cyclic
                    custom properties
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joepeck at webkit.org
                CC: hyatt at apple.com

* SUMMARY
Generate warning for inspector when there are cyclic custom properties.

Simliar to how parse errors generate warnings for the inspector, cyclic custom properties is probably never intentional.

* TEST
:root {
    --one: calc(var(--two) + 20px);
    --two: calc(var(--one) - 20px);
}

* NOTES
Cyclic properties detection:
<https://drafts.csswg.org/css-variables/#cycles>

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