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

One [suggestion](https://github.com/w3ctag/design-reviews/issues/494#issuecomment-647831832) came up in my TAG review related to the streaming concern. The idea was that perhaps we could specify declarative Shadow DOM in such a way that streaming support was implementation-**optional**. Support for attaching the shadow root at the closing `</template>` tag would be mandatory, but implementations could optionally decide to attach the shadow root at the opening `<template shadowroot>` tag, and parse child content directly into the `#shadowroot`. Because it is optional, implementations that did not want to tackle this more difficult streaming option could opt out. There would always need to be a developer opt-out, such as:

```html
<template shadowroot="open" do-not-stream>
  <content>
</template>  <!-- Shadow root always attached here -->
```

We would also likely need a way to feature-detect support for streaming.

Thoughts?

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