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

@domfarolino commented on this pull request.



> @@ -2845,6 +2911,101 @@ before a <var>child</var>, with an optional <i>suppress observers flag</i>, run
 </ol>
 
 
+<p><a lt="Other applicable specifications">Specifications</a> may define <dfn export
+id=concept-moving-steps-ext>moving steps</dfn> for all or some <a for=/>nodes</a>. The algorithm is
+passed a <a for=/>node</a> <var ignore>movedNode</var>, and a <a for=/>node</a>-or-null <var
+ignore>oldParent</var> as indicated in the <a for=/>move</a> algorithm below. Like the <span
+data-x="concept-insertion-steps-ext">insertion steps</span>, these steps must not modify the
+<a>node tree</a> that <var>insertedNode</var> <a>participates</a> in, create
+<a for=/>browsing contexts</a>, <a lt="fire an event">fire events</a>, or otherwise execute
+JavaScript. These steps may queue tasks to do these things asynchronously, however.
+
+
+<p>To <dfn export id=concept-node-move>move</dfn> a <var>node</var> into a <var>newParent</var>
+before a <var>child</var>, run these steps:

This was inspired by https://dom.spec.whatwg.org/#concept-node-insert, https://dom.spec.whatwg.org/#concept-node-ensure-pre-insertion-validity, and https://dom.spec.whatwg.org/#concept-node-pre-insert. Should I still remove it?

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