Update fragment serializing algorithm steps to accept Documents

This is used by the XMLHttpRequest Standard.

Author: lukewarlow

source

@@ -113063,9 +113063,9 @@ enum <dfn enum>DOMParserSupportedType</dfn> {
 
   <div w-nodev>
 
-  <p>The <dfn export>fragment serializing algorithm steps</dfn>, given an <code>Element</code> or
-  <code>DocumentFragment</code> <var>node</var> and a boolean <var>require well-formed</var>,
-  are:</p>
+  <p>The <dfn export>fragment serializing algorithm steps</dfn>, given an <code>Element</code>,
+  <code>Document</code> or <code>DocumentFragment</code> <var>node</var> and a boolean <var>require
+  well-formed</var>, are:</p>
 
   <ol>
     <li><p>Let <var>context document</var> be <var>node</var>'s <span>node document</span>.</p></li>