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

> > @mfreed7 : in terms of the implementation complexity of streaming, you can take a look at the PR: [WebKit/WebKit#4822](https://github.com/WebKit/WebKit/pull/4822)
> 
> Looks pretty clean, and very close to what I imagined. Just replace `.content` with `.fragmentForInsertion` everywhere, and hope you didn't miss any corner cases.

Yeah, the key trick I used is to still creating & pushing a template element into the stack of open elements. This allows the rest of HTML parser to behave as if a regular template element existed, and we'd stream content into the template element's document fragment like a normal template element; it's just that the document fragment is a shadow root in this case. It's significantly simpler than introducing a special mode of parser where the content is being streamed to shadow root without any template element to speak of.

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