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

How does streaming version compare to light DOM, if light DOM is such that it ends up having as many DOM nodes as the light+shadow DOM? But thanks for testing. And even when not thinking performance, I think we just need to go with streaming approach so that nested shadow dom, or fullpage shadow DOMs can be supported in a reasonable way

(note about polyfill, when I was testing this a bit more, was it last year, I tweaked MutationObserver so that it had a childElementName filter and that way Gecko with polyfill had almost the same speed as native implementation in Chrome. So - unrelated to declarative shadow DOM - perhaps we should add some more tweaks to MutationObserver. )

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