Bug 150406 – Generate warning for inspector when there are cyclic custom properties

• Status: NEW
• Component: CSS

[Joseph Pecoraro]

* 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>