CSS Values and Units: sibling-count() and sibling-index()

[lilles]

WebKittens

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Title of the proposal

CSS Values and Units: sibling-count() and sibling-index()

URL to the spec

https://drafts.csswg.org/css-values-5/#tree-counting

URL to the spec's repository

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Issue Tracker URL

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Explainer URL

https://github.com/w3c/csswg-drafts/blob/main/css-values-5/tree-counting-explainer.md

TAG Design Review URL

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Mozilla standards-positions issue URL

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WebKit Bugzilla URL

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Radar URL

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Description

CSS Values and Units Level 5 adds two tree-counting functions sibling-count() and sibling-index() which evaluate to integers at computed value time based on flat tree positions of the element we are computing styles for. These functions can be used where-ever integer values are allowed in property declarations.