Re: [whatwg/dom] Declarative Shadow DOM (#831)

@davatron5000 what do you mean by "slot hoisting"?

Instantiating declarative custom elements is definitely good future work, but it requires a lot more than what you've sketched to be practically useful.

The key thing to understand here is that this lets us serialize _instances_ of shadow roots. Most shadow roots of the same class of component are not identical - they have been produced by some kind of templating layer or DOM manipulation that makes each instance unique. So you usually can't simply refer to a template and stamp that out. you would need to provide it data and enable the template to specify the transform from data to actual DOM. Again, great future work and where the _template instantiation_ and _declarative custom elements_ ideas/proposal are pointing, but quite a bit different from this.

Even once we have declarative custom elements, it's quite likely that this proposal will be needed as is, since for serialization purposes we'll still need to describe the actual shadow root state of the particular instances in cases where we don't have the data that produced the DOM yet, or in the numerous cases where a shadow root wasn't produced by a declarative custom element.

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