Re: [whatwg/dom] Declarative Shadow DOM (#510)

@tabatkins the declarative custom elements strawman definitely helps with the CSS but it is probably not going to help with some of the other use-cases. The primary difference between both of them is that a declarative custom element defines a new tag name, and upgrades all instances of it, while the declarative shadow dom simply allows declarative encapsulation without preventing an eventual definition and upgrade of the element.

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