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CSS Custom Prop Fallback

v1.0.0

Fallback chain helper for var(--token) — generate guarded property declarations.

CSS Custom Property Fallback Chain
/* Token with full fallback chain */
.element {
  color: var(--color-primary, var(--color-brand-500, var(--color-blue-500, #1a73e8)));
}

/* Expanded (shows nesting): */
/* var(--color-primary,
     var(--color-brand-500,
     var(--color-blue-500,
     var(#1a73e8)
  ) */

/* Test all tokens exist: */
:root {
  --color-primary: /* value */;
}
:root {
  --color-brand-500: /* value */;
}
:root {
  --color-blue-500: /* value */;
}