Carryover evaluation: Container Queries

[foolip]

Let's evaluate whether to continue the Container Queries focus area in Interop 2024.

Original proposal: #133 by @una

Tests:

• All tests
• Failing tests

We should also consider whether we should add tests for 2024.

[foolip]

There are quite a few unlabeled tests to consider if we continue this. Some of them have been previously excluded from scope, but others are new.

If we continue this focus area, we should (later) also consider whether #433 is part of this focus area, or a new one.

[foolip]

For survey data and web developer demand, in preliminary results from State of HTML 2023, Container Queries (normalized to at_container) was a common response to the freeform question "Which existing HTML features or browser APIs are you unable to use because of browser differences or lack of support?"