Re: [WICG/webcomponents] [idea] New Lifecycle Callback: `willConnectCallback` for initializing attributes (#919)

I think the proper solution here is to eliminate all use cases for an element setting attributes on itself _not_ in response to property changes or user input. Just like with built-in elements, a custom element shouldn't spontaneously sprout attributes.

This means we need ElementInternals to handle focus, custom CSS state, and default ARIA roles and delegation. I believe all of those are in progress.

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