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[css-properties-values-api] Require var() fallbacks to match syntax. #833

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Nov 9, 2018
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[css-properties-values-api] Require var() fallbacks to match syntax. #833

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12 changes: 12 additions & 0 deletions css-properties-values-api/Overview.bs
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Expand Up @@ -589,6 +589,18 @@ to full URLs as described in [[!css3-values]].

</div>


Fallbacks in ''var()'' references {#fallbacks-in-var-references}
----------------------------------------------------------------

References to registered custom properties using the ''var()'' function may
provide a fallback. However, the fallback value must match the
[[#supported-syntax-strings|registered syntax]] of the custom property being
referenced, otherwise the declaration is
<a spec=css-variables>invalid at computed-value time</a>.

Note: This applies regardless of whether or not the fallback is being used.

Examples {#examples}
====================

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