Re: [whatwg/dom] Introduce `moveBefore()` state-preserving atomic move API (PR #1307)

@domfarolino commented on this pull request.



> + <li><p>If <var>parent</var> is not an {{Element}} or {{DocumentFragment}} <a for=/>node</a>, then
+ <a>throw</a> a "{{HierarchyRequestError!!exception}}" {{DOMException}}.

OK I've done that in https://github.com/whatwg/dom/pull/1307/commits/90c9a943a859267acd05b37c48120427e497c7e2, and changed the Chromium implementation and added a test in https://crrev.com/c/6081493. I agree this is a pretty minor change, especially since Documents can still only have a single Element child, and it is nice to have consistency with the pre-insertion validity conditions. I'll resolve this now.

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