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

> But didn't that discussion block the previous attempts and would slow down the creation and adoption of this feature in the first place?

It most certainly would. So I think the answer to @plinss's comment in https://github.com/w3ctag/design-reviews/issues/494#issuecomment-647831832 is that we cannot.

In particular, once script element is inserted into a shadow root which is connected, the script within will start executing synchronously. As a result, the process of inserting nodes into a shadow root is synchronously observable. If HTML is streamed into a shadow root, then the script execution will reveal the state of streaming for that precise reason. In addition, various events such as `load` event would fire for other elements as they get inserted into a connected shadow root so they too pose a significant script observable behavior difference.

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