Meta: Browser incompatibilities, CSS pain points and features missing from CSS overlap

Browser incompatibilities, CSS pain points and features missing from CSS overlap in regard of missing browser support.

What I mean with that is that participants may interpret missing support for a feature as a browser incompatibility. It may also be a pain point for them if they can't use a feature because of missing support. And if a feature is defined in the specifications but having zero browser support it may be feature they are missing from CSS.

So, maybe there could be a separate question asking people for features they know about but are not having enough browser support yet.

This goes in the same direction as #31 with the difference that it also covers features that _are_ supported in browsers but not everywhere yet like Subgrid or `:has()`.

If such a question is added, it should be clearly distinguished from the other three.

Sebastian