Re: [whatwg/dom] Don't allow adopting DocumentFragment of a template element (#744)

I'm not sure it's that simple. E.g., [replace all](https://dom.spec.whatwg.org/#concept-node-replace-all) can be passed a `ShadowRoot` and will adopt, from what I can tell. It will end up empty too, but still probably not what we want?

I think the problem is with `DocumentFragment`'s host is that we only tried to prevent truly broken cases and did not analyze other side effects enough.

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