[css-values-5] if() function style() syntax should allow for container-names

[mirisuzanne]

Currently the syntax for if() allows style conditions with style() – but there is no place to specify an explicit container to query by name. This will also be an issue if querying container sizes by way of unit-comparisons (eg 100cqi > 30em) - though I think we agreed to make a functional unit syntax for that.

[Loirooriol]

The functional container units were added in #7858 (comment)

[andruud]

(As discussed at CSS Day:)

The style() part within if() is actually not a container query; it queries the element itself.

Do we also need container (style) queries in if()?

[bigandy]

@andruud hell yeah we want container queries in if() I raised #12069 raising this.

[mirisuzanne]

I think the ability to query specific containers will be useful, yes.

[kizu]

In theory, #12604 could be used with comparisons for this effect, something like

if((container-var(--my-container, --my-variable) > 30em): …)