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[css-values-5] Add syntax definitions for sibling-count and sibling-index #14466

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[css-values-5] Add syntax definitions for sibling-count and sibling-index#14466
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@romainmenke
romainmenke
opened on Sep 9, 2026

See: https://drafts.csswg.org/css-values-5/#funcdef-sibling-count

<sibling-count()>  =  sibling-count()

<sibling-index()>  =  sibling-index()

This allows spec scrapers (like @webref) to pick up on the definition.

(also see: w3c/webref#2046)

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