Re: [csswg-drafts] [css-anchor] Detecting active @position-fallback (#8171)

> > It uses a new `container-type:anchored` ,and `container anchored(fallback: <integer>)` where `0` means no fallback is used and otherwise a 1-based index into the computed `position-try-fallbacks` value.
> > Disclaimer: I went for the number-indexing for fallbacks for ease of implementation as I wanted to explore implementability, containment requirements, and other limitations.
> 
> As discussed internally _(resharing here for visibility)_: I think we should eventually end up with a syntax where one can refer to a fallback keyword/ident in the query.
> 
> E.g. `@container anchored(fallback: none)`, `@container anchored(fallback: flip-block)`, `@container anchored(fallback: --horizontal)`, etc.
> 
> Referring to numeric indices is error-prone and requires one to adjust the numbers when inserting a new fallback option. But it sure is good enough to start playing with it :)

The prototype in Chrome now uses value-based queries instead of indices as of Canary 139.0.7251.0


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Received on Wednesday, 25 June 2025 13:05:07 UTC