Re: [w3c/webcomponents] How to define APIs only for custom element authors (#758)

@caridy I think `connectedCallback` is a little weird. E.g., if I do `const ce = new CustomElement()`, I wouldn't want to have to do `treeItem.append(ce)` before being able to setup various aspects of its behavior.

I'm also not sure all your assumptions are necessarily correct. E.g., if we allow setting ARIA roles and states through it, I'd expect those to be observable if we also add an API for computed ARIA role or some such.

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