[cssom] MediaList.item should be nullable. https://www.w3.org/Bugs/Public/show_bug.cgi?id=23452

Author: Simon Pieters

cssom/Overview.html

@@ -16,7 +16,7 @@
  <h1>CSS Object Model (CSSOM)</h1>
 
 
- <h2 class="no-num no-toc" id="w3c-doctype">Editor's Draft 19 September 2013</h2>
+ <h2 class="no-num no-toc" id="w3c-doctype">Editor's Draft 7 October 2013</h2>
 
  <dl>
 
@@ -90,7 +90,7 @@ <h2 class="no-num no-toc" id="sotd">Status of This Document</h2>
 can be found in the
 <a href="http://www.w3.org/TR/">W3C technical reports index at http://www.w3.org/TR/.</a></em>
 
-<p class="dontpublish">This is the 19 September 2013 Editor's Draft of CSSOM. Please send comments to
+<p class="dontpublish">This is the 7 October 2013 Editor's Draft of CSSOM. Please send comments to
 <a href="mailto:www-style@w3.org?subject=%5Bcssom%5D%20">www-style@w3.org</a>
 (<a href="http://lists.w3.org/Archives/Public/www-style/">archived</a>)
 with <samp>[cssom]</samp> at the start of the subject line.
@@ -582,7 +582,7 @@ <h3 id="the-medialist-interface"><span class="secno">4.4 </span>The <code title=
 interface <dfn id="medialist">MediaList</dfn> {
   [TreatNullAs=EmptyString] stringifier attribute DOMString <a href="#dom-medialist-mediatext" title="dom-MediaList-mediaText">mediaText</a>;
   readonly attribute unsigned long <a href="#dom-medialist-length" title="dom-MediaList-length">length</a>;
-  getter DOMString <a href="#dom-medialist-item" title="dom-MediaList-item">item</a>(unsigned long index);
+  getter DOMString? <a href="#dom-medialist-item" title="dom-MediaList-item">item</a>(unsigned long index);
   void <a href="#dom-medialist-appendmedium" title="dom-MediaList-appendMedium">appendMedium</a>(DOMString medium);
   void <a href="#dom-medialist-deletemedium" title="dom-MediaList-deleteMedium">deleteMedium</a>(DOMString medium);
 };</pre>
@@ -3298,6 +3298,7 @@ <h2 class="no-num" id="acknowledgments">Acknowledgments</h2>
 Lachlan Hunt,
 Mike Sherov,
 Morten Stenshorne,
+Ms2ger,
 Øyvind Stenhaug,
 Peter Sloetjes,
 Philip Taylor,

cssom/Overview.src.html

@@ -502,7 +502,7 @@ <h3>The <code title>MediaList</code> Interface</h3>
 interface <dfn>MediaList</dfn> {
   [TreatNullAs=EmptyString] stringifier attribute DOMString <span title=dom-MediaList-mediaText>mediaText</span>;
   readonly attribute unsigned long <span title=dom-MediaList-length>length</span>;
-  getter DOMString <span title=dom-MediaList-item>item</span>(unsigned long index);
+  getter DOMString? <span title=dom-MediaList-item>item</span>(unsigned long index);
   void <span title=dom-MediaList-appendMedium>appendMedium</span>(DOMString medium);
   void <span title=dom-MediaList-deleteMedium>deleteMedium</span>(DOMString medium);
 };</pre>
@@ -3170,6 +3170,7 @@ <h2 class="no-num">Acknowledgments</h2>
 Lachlan Hunt,
 Mike Sherov,
 Morten Stenshorne,
+Ms2ger,
 Øyvind Stenhaug,
 Peter Sloetjes,
 Philip Taylor,