Intent to prototype and ship: CSSContainerRule.conditions

[Emilio Cobos Álvarez]

Hi,

In bug 2022827 and related, we're adding support for multiple container conditions within a single CSS container query rule.

This makes the existing CSSContainerRule API a bit odd, since it exposes only one condition, so we're also expanding the interface a little bit. This is a relatively minor expansion, so hopefully uncontroversial.

Spec: https://github.com/w3c/csswg-drafts/pull/13635 (working group resolution on adopting it in https://github.com/w3c/csswg-drafts/issues/10845).

Standards Body: CSS WG

Platform coverage: All
Preference: None, relatively minor extension
DevTools bug: https://bugzilla.mozilla.org/show_bug.cgi?id=2023125
Extensions bug: N/A
Use counter: Added multiple use counters to track the old member's usage.
Link to standards-positions discussion: N/A
Other browsers: Haven't shipped yet but they are going to implement this as
part of interop 2026 so they'll get to it soon, presumably.
web-platform-tests: Added as part of the work.

Thanks,

 -- Emilio