Web platform features explorer - sibling-count() and sibling-index()

Web platform features explorer

Tags: css Groups: CSS

The sibling-count() and sibling-index() CSS functions return integers that are useful to style elements based on their positions among siblings or on the number of siblings, for example as part of a calc() expression.

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No MDN documentation found. You can search for the feature on MDN. If you believe that MDN has no documentation about this feature, you can open an issue on MDN's GitHub repository.

Specifications

CSS Values and Units Module Level 5 (#tree-counting), from Cascading Style Sheets (CSS) Working Group (W3C).

Browser support

Chrome 138 Released on 2025-06-24
Chrome Android 138 Released on 2025-06-24
Edge 138 Released on 2025-06-26
Firefox ❌ See bugzil.la/1953973 Vendor position
Firefox for Android ❌ See bugzil.la/1953973 Vendor position
Safari ❌ Vendor position
Safari on iOS ❌ Vendor position

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