Close #66: run the adopting steps recursively

When adopting a <template>'s template contents and running its own adopting steps
as defined in HTML, if the adopting steps aren't recursively, any nested template
won't see its template contents' owner document changed.

dom.bs

@@ -4628,22 +4628,21 @@ To <dfn export for=Node id=concept-node-adopt>adopt</dfn> a <var>node</var> into
 a <var>document</var>, run these steps:
 
 <ol>
- <li>Let <var>oldDocument</var> be <var>node</var>'s
- <a>node document</a>.
+ <li><p>Let <var>oldDocument</var> be <var>node</var>'s <a>node document</a>.
 
- <li>If <var>node</var>'s
- <a>parent</a> is not null,
- <a>remove</a> <var>node</var> from
- its <a>parent</a>.
+ <li><p>If <var>node</var>'s <a>parent</a> is not null, <a>remove</a> <var>node</var> from its
+ <a>parent</a>.
 
- <li>Set <var>node</var>'s
- <a>inclusive descendants</a>'s
- <a>node document</a> to <var>document</var>.
- <!--AttrExodus as well as any associated {{Attr}} nodes-->
+ <li>
+  <p>For each <var>descendant</var> in <var>node</var>'s <a>inclusive descendants</a>, in
+  <a>tree order</a>, run these substeps:
+
+  <ol>
+   <li><p>Set <var>descendant</var>'s <a>node document</a> to <var>document</var>.
+   <!--AttrExodus as well as any associated {{Attr}} nodes-->
 
- <li>Run any <a>adopting steps</a> defined for
- <var>node</var> in <a>other applicable specifications</a> and pass
- <var>node</var> and <var>oldDocument</var> as parameters.
+   <li><p>Run the <a>adopting steps</a> with <var>descendant</var> and <var>oldDocument</var>.
+  </ol>
 </ol>
 
 The

dom.html

@@ -2415,11 +2415,18 @@ <h3 class="heading settled" data-level="4.5" id="interface-document"><span class
    <p>To <dfn data-dfn-for="Node" data-dfn-type="dfn" data-export="" id="concept-node-adopt">adopt<a class="self-link" href="#concept-node-adopt"></a></dfn> a <var>node</var> into
 a <var>document</var>, run these steps:</p>
    <ol>
-    <li>Let <var>oldDocument</var> be <var>node</var>’s <a data-link-type="dfn" href="#concept-node-document">node document</a>. 
-    <li>If <var>node</var>’s <a data-link-type="dfn" href="#concept-tree-parent">parent</a> is not null, <a data-link-type="dfn" href="#concept-node-remove">remove</a> <var>node</var> from
- its <a data-link-type="dfn" href="#concept-tree-parent">parent</a>. 
-    <li>Set <var>node</var>’s <a data-link-type="dfn" href="#concept-tree-inclusive-descendant">inclusive descendants</a>’s <a data-link-type="dfn" href="#concept-node-document">node document</a> to <var>document</var>. 
-    <li>Run any <a data-link-type="dfn" href="#concept-node-adopt-ext">adopting steps</a> defined for <var>node</var> in <a data-link-type="dfn" href="#other-applicable-specifications">other applicable specifications</a> and pass <var>node</var> and <var>oldDocument</var> as parameters. 
+    <li>
+     <p>Let <var>oldDocument</var> be <var>node</var>’s <a data-link-type="dfn" href="#concept-node-document">node document</a>. </p>
+    <li>
+     <p>If <var>node</var>’s <a data-link-type="dfn" href="#concept-tree-parent">parent</a> is not null, <a data-link-type="dfn" href="#concept-node-remove">remove</a> <var>node</var> from its <a data-link-type="dfn" href="#concept-tree-parent">parent</a>. </p>
+    <li>
+     <p>For each <var>descendant</var> in <var>node</var>’s <a data-link-type="dfn" href="#concept-tree-inclusive-descendant">inclusive descendants</a>, in <a data-link-type="dfn" href="#concept-tree-order">tree order</a>, run these substeps: </p>
+     <ol>
+      <li>
+       <p>Set <var>descendant</var>’s <a data-link-type="dfn" href="#concept-node-document">node document</a> to <var>document</var>. </p>
+      <li>
+       <p>Run the <a data-link-type="dfn" href="#concept-node-adopt-ext">adopting steps</a> with <var>descendant</var> and <var>oldDocument</var>. </p>
+     </ol>
    </ol>
    <p>The <dfn class="idl-code" data-dfn-for="Document" data-dfn-type="method" data-export="" id="dom-document-adoptnode">adoptNode(<var>node</var>)<a class="self-link" href="#dom-document-adoptnode"></a></dfn> method must run these steps:</p>
    <ol>