[Webkit-unassigned] [Bug 204165] New: Add support for selector() feature query

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204165

            Bug ID: 204165
           Summary: Add support for selector() feature query
           Product: WebKit
           Version: Safari 13
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: miriam at oddbird.net

- `@supports selector( <complex-selector> )`
- From CSS Conditionals Module Level 4 (https://drafts.csswg.org/css-conditional-4/)

As browsers start to roll out selectors from level 4 – :focus-within, :focus-visible, :is, :where, ::marker, extended :not and :nth-child, etc – authors are excited to start using these new tools, but we don't have the @supports control to manage fallbacks. That problem is exacerbated by the new selectors landing *before* our ability to check for them. It's frustrating to have a feature-query that has less support than the feature being queried. The longer this feature is delayed, the less useful it becomes for a new round of selectors already appearing in browsers.

Firefox has already shipped, and chromium is planning to implement this month (https://bugs.chromium.org/p/chromium/issues/detail?id=979041#c8).

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