Deal with the scoped document set

Author: annevk

dom.bs

@@ -2830,6 +2830,13 @@ before a <var>child</var>, with an optional <i>suppress observers flag</i>, run
        <var>inclusiveDescendant</var>'s <a for=tree>parent</a>.
        <!-- XXX xref -->
 
+       <li><p>Otherwise, if <var>inclusiveDescendant</var>'s
+       <a for=Element>custom element registry</a>'s <b>is scoped</b> is true, <a for=set>append</a>
+       <var>inclusiveDescendant</var>'s <a for=Node>node document</a> to
+       <var>inclusiveDescendant</var>'s <a for=Element>custom element registry</a>'s
+       <b>scoped document set</b>.
+       <!-- XXX xref -->
+
        <li><p>If <var>inclusiveDescendant</var> is <a for=Element>custom</a>, then
        <a>enqueue a custom element callback reaction</a> with <var>inclusiveDescendant</var>,
        callback name "<code>connectedCallback</code>", and « ».
@@ -2844,21 +2851,26 @@ before a <var>child</var>, with an optional <i>suppress observers flag</i>, run
       </ol>
 
      <li>
-      <p>Otherwise, if all of the following are true:
-
-      <ul class=brief>
-       <li><var>inclusiveDescendant</var> is <a>connected</a>,
-       <li><var>inclusiveDescendant</var> is a <a for=/>shadow root</a>,
-       <li><var>inclusiveDescendant</var>'s <a for=ShadowRoot>custom element registry</a> is null,
-       and
-       <li><var>inclusiveDescendant</var>'s <a for=ShadowRoot>keep custom element registry null</a>
-       is false,
-      </ul>
+      <p>Otherwise, if <var>inclusiveDescendant</var> is <a>connected</a> and is a
+      <a for=/>shadow root</a>:
 
-      <p>then set <var>inclusiveDescendant</var>'s <a for=ShadowRoot>custom element registry</a> to
-      the result of <b>looking up a custom element registry</b> given
-      <var>inclusiveDescendant</var>'s <a for=DocumentFragment>host</a>.
-      <!-- XXX xref -->
+      <ol>
+       <li><p>If <li><var>inclusiveDescendant</var>'s <a for=ShadowRoot>custom element registry</a>
+       is null and <li><var>inclusiveDescendant</var>'s
+       <a for=ShadowRoot>keep custom element registry null</a> is false, then set
+       <var>inclusiveDescendant</var>'s <a for=ShadowRoot>custom element registry</a> to the result
+       of <b>looking up a custom element registry</b> given <var>inclusiveDescendant</var>'s
+       <a for=DocumentFragment>host</a>.
+       <!-- XXX xref -->
+
+       <li><p>Otherwise, if <var>inclusiveDescendant</var>'s
+       <a for=ShadowRoot>custom element registry</a> is non-null and
+       <var>inclusiveDescendant</var>'s <a for=ShadowRoot>custom element registry</a>'s
+       <b>is scoped</b> is true, <a for=set>append</a> <var>inclusiveDescendant</var>'s
+       <a for=Node>node document</a> to <var>inclusiveDescendant</var>'s
+       <a for=ShadowRoot>custom element registry</a>'s <b>scoped document set</b>.
+       <!-- XXX xref -->
+      </ol>
     </ol>
   </ol>