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

```
<div>
    <shadowroot>
        ...
    </shadowroot>
    ...
</div>
```

I think this is an anti-pattern because we are defining a `shadowroot` on a standard element (like `div`, `span`, `main`, etc...) which if I remember it right, will not work. 

And if we use a `custom-element`, we really don't need to put a `shadowroot` element because there's already a template mechanism being used that defines the shadowDOM of that custom element. The only thing needed is some SSR library to render that shadowDOM into a `shadowroot`, and then append/prepend it.

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