[css-conditional] Add named feature for style queries

[benface]

Given that the Working Group resolved on adding a named-feature() function that can be used inside @supports in #3559 (comment) and #9875 (comment), I would propose adding a style-queries named feature. Style queries are currently only supported in Chromium browsers and Safari TP.

[mirisuzanne]

@benface can this be closed as unnecessary, given the resolution you linked above?

[benface]

@mirisuzanne, I might be missing something, but I don't think it was decided to add a named feature for style queries?

[mirisuzanne]

Oh, I see we didn't even resolve that issue. I keep being over-optimistic about that one in my memory. I do think a test for at-rule preludes would be the more ideal solution here… but based on the timeframe, it sure wouldn't be the more practical solution.

[benface]

Looks like it was resolved to add a named-feature() function, but the only named feature that I see proposed for now is align-content-on-display-block. I am proposing style-queries, so support could be tested with @supports named-feature(style-queries).