Preserve reference child in insertion redirection for foster parenting

Author: noamr

source

@@ -144474,9 +144474,28 @@ dictionary <dfn dictionary>StorageEventInit</dfn> : <span>EventInit</span> {
    <li><p>Let <var>targetParent</var> be the node in which <var>adjustedInsertionLocation</var>
    finds itself.</p></li>
 
-   <li><p>If the parser's <span>insertion target redirection map</span>[<var>targetParent</var>]
-   <span data-x="map exists">exists</span>, then set <var>adjustedInsertionLocation</var> to
-   that.</p></li>
+    <li>
+    <p>If the parser's <span>insertion target redirection map</span>[<var>targetParent</var>]
+    <span data-x="map exists">exists</span>, then:</p>
+
+    <ol>
+     <li><p>Let <var>redirectedLocation</var> be the parser's <span>insertion target redirection
+     map</span>[<var>targetParent</var>].</p></li>
+
+     <li><p>Let <var>redirectedParent</var> be the node in which <var>redirectedLocation</var>
+     finds itself.</p></li>
+
+     <li>
+      <p>If <var>adjustedInsertionLocation</var> is immediately before a node
+      <var>referenceChild</var>, and <var>referenceChild</var>'s parent node is
+      <var>redirectedParent</var>, then set <var>adjustedInsertionLocation</var> to inside
+      <var>redirectedParent</var>, immediately before <var>referenceChild</var>.</p>
+     </li>
+
+     <li><p>Otherwise, set <var>adjustedInsertionLocation</var> to
+     <var>redirectedLocation</var>.</p></li>
+    </ol>
+   </li>
 
    <li><p>Return <var>adjustedInsertionLocation</var>.</p></li>
   </ol>