Contact emails
futh...@chromium.org, se...@chromium.org

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


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


Summary

sibling-index() and sibling-count() can be used as integers in CSS property 
values to style elements based on their position among its siblings, or the 
total number of siblings respectively. These functions can be used directly as 
integer values, but more interestingly inside calc() expressions. Example: li { 
margin-left: calc(10px * sibling-index()); }



Blink component
Blink>CSS


Motivation

>From the explainer: "Authors have been asking for a convenient way of styling 
>elements based on their DOM position among their siblings as well as the total 
>number of siblings. Example use cases for this are staggered animations 
>setting the animation- or transition-delay based on the sibling position, and 
>building a radial menu."



Initial public proposal
None


TAG review
None


TAG review status
Pending


Risks




Interoperability and Compatibility

None


Gecko: No signal

WebKit: No signal

Web developers: No signals

Other signals:


WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it 
has potentially high risk for Android WebView-based applications?

None




Debuggability

None



Is this feature fully tested by web-platform-tests?
No


Flag name on about://flags
None


Finch feature name
None


Non-finch justification
None


Requires code in //chrome?
False


Estimated milestones

No milestones specified



Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/6225478530367488?gate=5089301572091904


This intent message was generated by Chrome Platform Status.

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