diff --git a/index b/index
index 9a2ba550bce..4b516e6686c 100644
--- a/index
+++ b/index
@@ -653,7 +653,8 @@
      <li><a href=#custom-handlers><span class=secno>5.6.2 </span>Custom protocol and content handlers</a>
       <ol>
        <li><a href=#security-and-privacy><span class=secno>5.6.2.1 </span>Security and privacy</a></li>
-       <li><a href=#sample-handler-impl><span class=secno>5.6.2.2 </span>Sample user interface</a></ol></ol></li>
+       <li><a href=#sample-handler-impl><span class=secno>5.6.2.2 </span>Sample user interface</a></ol></li>
+     <li><a href=#client-abilities><span class=secno>5.6.3 </span>Client abilities</a></ol></li>
    <li><a href=#offline><span class=secno>5.7 </span>Offline Web applications</a>
     <ol>
      <li><a href=#introduction-0><span class=secno>5.7.1 </span>Introduction</a></li>
@@ -16687,6 +16688,9 @@ interface <dfn id=htmlaudioelement>HTMLAudioElement</dfn> : <a href=#htmlmediael
   task">queued</a> in this section and its subsections is the
   <a href=#media-element-event-task-source>media element event task source</a>.</p>
 
+  <p>The <code title=dom-navigator-canPlayType><a href=#dom-navigator-canplaytype>canPlayType()</a></code>
+  method can be used to probe the user agent to determine what types
+  are supported.</p>
 
 
   <h5 id=error-codes><span class=secno>4.8.10.1 </span>Error codes</h5>
@@ -33411,10 +33415,14 @@ JSURL: http://ietfreport.isoc.org/all-ids/draft-hoehrmann-javascript-scheme-00.t
   readonly attribute boolean <a href=#dom-navigator-online title=dom-navigator-onLine>onLine</a>;
   void <a href=#dom-navigator-registerprotocolhandler title=dom-navigator-registerProtocolHandler>registerProtocolHandler</a>(in DOMString protocol, in DOMString url, in DOMString title);
   void <a href=#dom-navigator-registercontenthandler title=dom-navigator-registerContentHandler>registerContentHandler</a>(in DOMString mimeType, in DOMString url, in DOMString title);
+
+  // abilities<!--
+  XXX cookieEnabled geolocator javaEnabled mozIsLocallyAvailable plugins preference
+  readonly attribute <span>MimeTypeArray</span> <span title="dom-navigator-mimeTypes">mimeTypes</span>;-->
+  short <a href=#dom-navigator-canplaytype title=dom-navigator-canPlayType>canPlayType</a>(in DOMString type);
 };</pre>
 
    <!-- XXX also, see window.external.AddSearchProvider() and similar DOM APIs from IE -->
-   <!-- XXX also, see: cookieEnabled geolocator javaEnabled mimeTypes mozIsLocallyAvailable plugins preference -->
 
    <!-- XXX also, could expose languages:
    <dt><dfn title="dom-navigator-browserLanguage"><code>browserLanguage</code></dfn></dt> <!- - Opera and IE only - ->
@@ -33784,6 +33792,17 @@ JSURL: http://ietfreport.isoc.org/all-ids/draft-hoehrmann-javascript-scheme-00.t
 
 
 
+  <h4 id=client-abilities><span class=secno>5.6.3 </span>Client abilities</h4>
+
+  <p>The <dfn id=dom-navigator-canplaytype title=dom-navigator-canPlayType><code>canPlayType(<var title="">type</var>)</code></dfn> method must return 1 if <var title="">type</var> is a MIME type that the user agent is confident
+  represents a <a href=#media-resource>media resource</a> that it can render if used
+  in a <code><a href=#audio>audio</a></code> or <code><a href=#video>video</a></code> element, 0 if it
+  cannot determine whether it could do so, and &minus;1 if it is
+  confident that it would not be able to render resources of that
+  type.</p>
+
+
+
   <h3 id=offline><span class=secno>5.7 </span>Offline Web applications</h3>
 
   <h4 id=introduction-0><span class=secno>5.7.1 </span>Introduction</h4>
diff --git a/source b/source
index a4f0e26d02d..17a7c1bb20f 100644
--- a/source
+++ b/source
@@ -17809,6 +17809,9 @@ interface <dfn>HTMLAudioElement</dfn> : <span>HTMLMediaElement</span> {
   task">queued</span> in this section and its subsections is the
   <span>media element event task source</span>.</p>
 
+  <p>The <code title="dom-navigator-canPlayType">canPlayType()</code>
+  method can be used to probe the user agent to determine what types
+  are supported.</p>
 
 
   <h5>Error codes</h5>
@@ -37931,10 +37934,14 @@ JSURL: http://ietfreport.isoc.org/all-ids/draft-hoehrmann-javascript-scheme-00.t
   readonly attribute boolean <span title="dom-navigator-onLine">onLine</span>;
   void <span title="dom-navigator-registerProtocolHandler">registerProtocolHandler</span>(in DOMString protocol, in DOMString url, in DOMString title);
   void <span title="dom-navigator-registerContentHandler">registerContentHandler</span>(in DOMString mimeType, in DOMString url, in DOMString title);
+
+  // abilities<!--
+  XXX cookieEnabled geolocator javaEnabled mozIsLocallyAvailable plugins preference
+  readonly attribute <span>MimeTypeArray</span> <span title="dom-navigator-mimeTypes">mimeTypes</span>;-->
+  short <span title="dom-navigator-canPlayType">canPlayType</span>(in DOMString type);
 };</pre>
 
    <!-- XXX also, see window.external.AddSearchProvider() and similar DOM APIs from IE -->
-   <!-- XXX also, see: cookieEnabled geolocator javaEnabled mimeTypes mozIsLocallyAvailable plugins preference -->
 
    <!-- XXX also, could expose languages:
    <dt><dfn title="dom-navigator-browserLanguage"><code>browserLanguage</code></dfn></dt> <!- - Opera and IE only - ->
@@ -38335,6 +38342,19 @@ JSURL: http://ietfreport.isoc.org/all-ids/draft-hoehrmann-javascript-scheme-00.t
 
 
 
+  <h4>Client abilities</h4>
+
+  <p>The <dfn title="dom-navigator-canPlayType"><code>canPlayType(<var
+  title="">type</var>)</code></dfn> method must return 1 if <var
+  title="">type</var> is a MIME type that the user agent is confident
+  represents a <span>media resource</span> that it can render if used
+  in a <code>audio</code> or <code>video</code> element, 0 if it
+  cannot determine whether it could do so, and &#x2212;1 if it is
+  confident that it would not be able to render resources of that
+  type.</p>
+
+
+
   <h3 id="offline">Offline Web applications</h3>
 
   <h4>Introduction</h4>