Re: [w3c/webcomponents] observedStyles (#856)

> I think that's a pretty huge benefit when designing custom elements. Built-in elements are able to perform work when CSS properties change, high-fidelity custom elements should be able to as well.

That's not really a thing. It's true that some builtin elements have special style magic that responds to style changes but that's more of a missing CSS features.

Anyway, what we need is a list of concrete use cases. There is no way we're gonna add a serious foot gun like this unless there are extremely compelling reasons to do so.

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