[e] (0) Mention audio descriptions explicitly.

Fixing http://www.w3.org/Bugs/Public/show_bug.cgi?id=8187

git-svn-id: http://svn.whatwg.org/webapps@4460 340c8d12-0b0e-0410-8428-c7bf67bfef74

complete.html

@@ -21282,7 +21282,8 @@ <h4 id=video><span class=secno>4.8.7 </span>The <dfn><code>video</code></dfn> el
   the blind, deaf, and those with other physical or cognitive
   disabilities, authors are expected to provide alternative media
   streams and/or to embed accessibility aids (such as caption or
-  subtitle tracks) into their media streams.</p>
+  subtitle tracks, audio description tracks, or sign-language
+  overlays) into their media streams.</p>
 
   <p>The <code><a href=#video>video</a></code> element is a <a href=#media-element>media element</a>
   whose <a href=#media-data>media data</a> is ostensibly video data, possibly
@@ -21431,8 +21432,9 @@ <h4 id=video><span class=secno>4.8.7 </span>The <dfn><code>video</code></dfn> el
   is available; otherwise it is 150 CSS pixels.</p>
 
   <hr><p>User agents should provide controls to enable or disable the
-  display of closed captions associated with the video stream, though
-  such features should, again, not interfere with the page's normal
+  display of closed captions, audio description tracks, and other
+  additional data associated with the video stream, though such
+  features should, again, not interfere with the page's normal
   rendering.</p>
 
   <p>User agents may allow users to view the video content in manners

index

@@ -21117,7 +21117,8 @@ href="?audio"&gt;audio&lt;/a&gt; test instead.)&lt;/p&gt;</pre>
   the blind, deaf, and those with other physical or cognitive
   disabilities, authors are expected to provide alternative media
   streams and/or to embed accessibility aids (such as caption or
-  subtitle tracks) into their media streams.</p>
+  subtitle tracks, audio description tracks, or sign-language
+  overlays) into their media streams.</p>
 
   <p>The <code><a href=#video>video</a></code> element is a <a href=#media-element>media element</a>
   whose <a href=#media-data>media data</a> is ostensibly video data, possibly
@@ -21266,8 +21267,9 @@ href="?audio"&gt;audio&lt;/a&gt; test instead.)&lt;/p&gt;</pre>
   is available; otherwise it is 150 CSS pixels.</p>
 
   <hr><p>User agents should provide controls to enable or disable the
-  display of closed captions associated with the video stream, though
-  such features should, again, not interfere with the page's normal
+  display of closed captions, audio description tracks, and other
+  additional data associated with the video stream, though such
+  features should, again, not interfere with the page's normal
   rendering.</p>
 
   <p>User agents may allow users to view the video content in manners

source

@@ -22632,7 +22632,8 @@ href="?audio">audio&lt;/a> test instead.)&lt;/p></pre>
   the blind, deaf, and those with other physical or cognitive
   disabilities, authors are expected to provide alternative media
   streams and/or to embed accessibility aids (such as caption or
-  subtitle tracks) into their media streams.</p>
+  subtitle tracks, audio description tracks, or sign-language
+  overlays) into their media streams.</p>
 
   <p>The <code>video</code> element is a <span>media element</span>
   whose <span>media data</span> is ostensibly video data, possibly
@@ -22812,8 +22813,9 @@ href="?audio">audio&lt;/a> test instead.)&lt;/p></pre>
   <hr>
 
   <p>User agents should provide controls to enable or disable the
-  display of closed captions associated with the video stream, though
-  such features should, again, not interfere with the page's normal
+  display of closed captions, audio description tracks, and other
+  additional data associated with the video stream, though such
+  features should, again, not interfere with the page's normal
   rendering.</p>
 
   <p>User agents may allow users to view the video content in manners