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 a {{Document}}, {{DocumentFragment}}, or {{Element}}
+ <a for=/>node</a>, then <a>throw</a> a "{{HierarchyRequestError!!exception}}" {{DOMException}}.
+
+ <li><p>If <var>node</var> is a <a>host-including inclusive ancestor</a> of <var>parent</var>, then
+ <a>throw</a> a "{{HierarchyRequestError!!exception}}" {{DOMException}}.
+
+ <li><p>If <var>child</var> is non-null and its <a for=tree>parent</a> is not <var>parent</var>,
+ then <a>throw</a> a "{{NotFoundError!!exception}}" {{DOMException}}.
+
+ <li><p>If <var>node</var> is not an {{Element}} or a {{CharacterData}} <a for=/>node</a>, then
+ <a>throw</a> a "{{HierarchyRequestError!!exception}}" {{DOMException}}.</p></li>
+
+ <li><p>If <var>node</var> is a {{Text}} <a for=/>node</a> and <var>parent</var> is a
+ <a>document</a>, then <a>throw</a> a "{{HierarchyRequestError!!exception}}" {{DOMException}}.
+
+ <li><p>If <var>parent</var> is a {{Document}}, <var>node</var> is an {{Element}}

Out of curiosity, why this change? Earlier in this algorithm we do a very similar comparison of `<var>parent</var>`, but with `{{Document}}`.

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