allow div as a child of dl

align with whatwg, where it makes sense

sections/semantics-grouping-content.include

@@ -1178,9 +1178,12 @@
     <dd>Where <a>flow content</a> is expected.</dd>
     <dt><a>Content model</a>:</dt>
     <dd>
-      Zero or more groups each consisting of one or more <{dt}> elements followed by one or
+      Either:Zero or more groups each consisting of one or more <{dt}> elements followed by one or
       more <{dd}> elements, optionally intermixed with <a>script-supporting elements</a>.
     </dd>
+    <dd>
+     Or: One or more div elements, optionally intermixed with script-supporting elements.
+    </dd>
     <dt><a>Tag omission in text/html</a>:</dt>
     <dd>Neither tag is omissible</dd>
     <dt><a>Content attributes</a>:</dt>
@@ -1200,9 +1203,15 @@
     </dd>
   </dl>
 
-  The <{dl}> element <a>represents</a> a description list of zero or more <dfn>term-description groups</dfn>. Each <a>term-description group</a> consists of one or more terms (represented by <{dt}> elements), and one or more descriptions (represented by <{dd}> elements).
+  The <{dl}> element <a>represents</a> a description list of zero or more <dfn>term-description groups</dfn>. 
+  Each <a>term-description group</a> consists of one or more terms (represented by <{dt}> elements) 
+  possibly as children of a <{div}> element child), and one or more descriptions (represented by 
+  <{dd}> elements possibly as children of a <{div}> element child), ignoring any nodes other than <{dt}>
+  and <{dd}> element children, and <code>dt</code> and <code>dd</code> elements that are children of 
+  <{div}> element children. Within a single <{dl}> element.
 
-  <a>Term-description groups</a> may be names  and definitions, questions and answers, categories and topics, or any other groups of term-description pairs.
+  <a>Term-description groups</a> may be names  and definitions, questions and answers, categories 
+  and topics, or any other groups of term-description pairs.
 
   <div class="example">
     <p>In this example a <{dl}> is used to represent a simple list of names and descriptions:</p>
@@ -1982,8 +1991,11 @@
     <dd><a>Palpable content</a>.</dd>
     <dt><a>Contexts in which this element can be used</a>:</dt>
     <dd>Where <a>flow content</a> is expected.</dd>
+    <dd>As a child of a <{dl}> element.</dd>
     <dt><a>Content model</a>:</dt>
-    <dd><a>Flow content</a>.</dd>
+    <dd>If the element is a child of a <code>dl</code> element: one or more <{dt}> elements 
+    followed by one or more <{dd}> elements, optionally intermixed with script-supporting elements.
+    <dd> If the element is not a child of a <code>dl</code> element: <a>Flow content</a>.</dd>
     <dt><a>Tag omission in text/html</a>:</dt>
     <dd>Neither tag is omissible</dd>
     <dt><a>Content attributes</a>:</dt>