#41290 CSS: Fix sibling-index() example to use counters with content #41339
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Description
This PR fixes the “Ordered list” example on the sibling-index() documentation page.
Motivation
The bug: The old example set content: var(--list-index); where --list-index was just an integer. The CSS content property does not accept raw numbers, so the pseudo-element would render nothing.
The fix: By introducing a CSS counter (counter-set + counter()), the numeric value from sibling-index() is converted into a valid, displayable string.
Additional details
Related issues and pull requests
Fixes #41290