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}}.

Hmm, OK. Would you prefer we simply make this condition perfectly match the pre-insertion validity steps? I.e., expanding it to include Document parents too? I'm fine with that. Let me know what you think @annevk.

> Yeah, I'd expect this to handle basically ParentNode mixin.

Hmm, I'm not exactly sure what this means. But does what I recommend above satisfy what you're looking for?

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