[cssom] Define MediaList's getter

Author: Simon Pieters

cssom/Overview.html

@@ -565,6 +565,10 @@ <h3 id="the-medialist-interface"><span class="secno">4.4 </span>The <code title=
   void <a href="#dom-medialist-deletemedium" title="dom-MediaList-deleteMedium">deleteMedium</a>(DOMString medium);
 };</pre>
 
+<p>The object's <a class="external" href="http://dev.w3.org/2006/webapi/WebIDL/#dfn-supported-property-indices">supported property indices</a> are the numbers in the range zero to one less than the number of media queries
+in the <a href="#collection-of-media-queries">collection of media queries</a> represented by the collection. If there are no such media queries, then there are no
+<a class="external" href="http://dev.w3.org/2006/webapi/WebIDL/#dfn-supported-property-indices">supported property indices</a>.
+
 <p>When the <dfn id="dom-medialist" title="dom-MediaList"><code>MediaList(<var>text</var>)</code></dfn> constructor is invoked, run these steps:</p>
 <ol>
  <li><p>Create a new <code><a href="#medialist">MediaList</a></code> object.</li>
@@ -2075,7 +2079,7 @@ <h4 id="the-cssstyledeclaration-interface"><span class="secno">6.5.1 </span>The
   DOMString <a href="#dom-cssstyledeclaration-item" title="dom-CSSStyleDeclaration-item">item</a>(unsigned long index);
   DOMString <a href="#dom-cssstyledeclaration-getpropertyvalue" title="dom-CSSStyleDeclaration-getPropertyValue">getPropertyValue</a>(DOMString property);
   DOMString <a href="#dom-cssstyledeclaration-getpropertypriority" title="dom-CSSStyleDeclaration-getPropertyPriority">getPropertyPriority</a>(DOMString property);
-  void <a href="#dom-cssstyledeclaration-setproperty" title="dom-CSSStyleDeclaration-setProperty">setProperty</a>(DOMString property, DOMString value, optional DOMString priority);
+  void <a href="#dom-cssstyledeclaration-setproperty" title="dom-CSSStyleDeclaration-setProperty">setProperty</a>(DOMString property, DOMString value, optional [TreatNullAs=EmptyString] DOMString priority);
   DOMString <a href="#dom-cssstyledeclaration-removeproperty" title="dom-CSSStyleDeclaration-removeProperty">removeProperty</a>(DOMString property);
   readonly attribute <a href="#cssrule">CSSRule</a>? <a href="#dom-cssstyledeclaration-length" title="dom-CSSStyleDeclaration-length">parentRule</a>;
 };</pre>

cssom/Overview.src.html

@@ -495,6 +495,10 @@ <h3>The <code title>MediaList</code> Interface</h3>
   void <span title=dom-MediaList-deleteMedium>deleteMedium</span>(DOMString medium);
 };</pre>
 
+<p>The object's <span data-anolis-spec=webidl>supported property indices</span> are the numbers in the range zero to one less than the number of media queries
+in the <span>collection of media queries</span> represented by the collection. If there are no such media queries, then there are no
+<span data-anolis-spec=webidl>supported property indices</span>.
+
 <p>When the <dfn title=dom-MediaList><code>MediaList(<var>text</var>)</code></dfn> constructor is invoked, run these steps:</p>
 <ol>
  <li><p>Create a new <code>MediaList</code> object.</p></li>