Re: [csswg-drafts] [css-values] Proposal: add sibling-count() and sibling-index() (#4559)

>     animation-delay: calc( 2s * ( var(--sibling-index) / var(--sibling-count) ) );

This assumes that the index is 0-based. I would prefer it to be 1-based for consistency with nth-child.
Also, be aware that if you only have 1 child, you will have a 0/0 division.
I would argue that `index-1-based / parent-children-count` would be safer, and not getting 0 for the 1st child doesn't seem a big problem.

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