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[PostCSS Progressive Custom Properties] is a utility plugin to correctly declare Custom Property fallbacks and enhancements.
-⚠️ It is not intended to be used directly by stylesheet authors.
-Meant to be included in other PostCSS plugins that provide CSS value transforms as fallbacks.
+> [!WARNING]
+> It is not intended to be used directly by stylesheet authors.
+> Meant to be included in other PostCSS plugins that provide CSS value transforms as fallbacks.
[Custom Properties are not discarded like regular declarations when invalid.](https://www.w3.org/TR/css-variables-1/#invalid-variables)
This makes it tricky to provide fallback values for older browsers.