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conformance · v133

v133 · css-sibling-index-and-sibling-count — conformance probe

5 assertions drawn from the spec. Each is a single contract the spec text makes. Pass/fail reflects what this browser executed; blocked means the contract was not run because it needs user mediation, hardware, or another unavailable precondition. Open the page in Chrome stable / canary / Firefox / Safari to compare.

browser: spec: https://drafts.csswg.org/css-values-5/#tree-counting chromestatus: #6225478530367488 generated 2026-06-01T08:12:59Z by conformance-author-v1-subagent
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pass
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fail
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blocked
5
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id contract kind verdict detail
sibling-index-function-supported The sibling-index() function is accepted in integer-valued properties. spec ↗ css-supports
sibling-count-function-supported The sibling-count() function is accepted in integer-valued properties. spec ↗ css-supports
sibling-index-in-calc sibling-index() composes inside calc() expressions. css-supports
sibling-index-resolves-numerically sibling-index() resolves to the 1-based element-tree position; the second of three siblings computes to 2. spec ↗ script
sibling-count-resolves-numerically sibling-count() resolves to the total number of element siblings (inclusive). script