Is there an event that fires when an element's `class` attribute changes?
<p>I have a <code>&lt;ul&gt;</code> element on my page with a few children.  A <code>class</code> attribute will be added to these children at some point, </p>

<p>Before</p>

<pre><code>&lt;ul&gt;
  &lt;li&gt;1&lt;/li&gt;
  &lt;li&gt;2&lt;/li&gt;
  &lt;li&gt;3&lt;/li&gt;
&lt;/ul&gt;
</code></pre>

<p>After</p>

<pre><code>&lt;ul&gt;
  &lt;li class='classname'&gt;1&lt;/li&gt;
  &lt;li&gt;2&lt;/li&gt;
  &lt;li&gt;3&lt;/li&gt;
&lt;/ul&gt;
</code></pre>

<p>I would like to bind to an event that will fire whenever the <code>li</code> element's class changes, so I can handle it accordingly.  Is there such an event?</p>
