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

@smaug---- commented on this pull request.



> @@ -2652,6 +2652,63 @@ of a <var>node</var> into a <var>parent</var> before a <var>child</var>, run the
  <!-- Technically this is post-insert. -->
 </ol>
 
+<p>To <dfn export for=Node id=concept-node-ensure-pre-move-validity>ensure pre-move validity</dfn>
+of a <var>node</var> into a <var>parent</var> before a <var>child</var>, run these steps:
+
+<ol>
+ <li>
+  <p>If any of the following conditions are true</p>
+
+  <ul>
+   <li><p><var>parent</var> is <a>connected</a> and <var>node</var> is not <a>connected</a>; or</p></li>
+
+   <li><p><var>parent</var> is not <a>connected</a> and <var>node</var> is <a>connected</a>,</p></li>
+  </ul>

Why do we need this when we have " If parent ’s shadow-including root is not the same as node ’s shadow-including root " check below?

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