[whatwg/dom] Observe changes in computed styles via MutationObserver? (Issue #1041)

(This issue might be filed in the completely wrong place. I’m not 100% sure where it should live.)

THe most recent interation of the [Container Queries spec](https://drafts.csswg.org/css-contain-3/#typedef-style-query) specifies a new syntax that not only allows you to query a container’s size, but also it’s computed style. For example:

```css
@container (color: red) {
  h1 {
  }
}
```

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