optgroup not viewable?
<p>Why is the optgroup here not viewable?</p>

<p>All options are shown, but not the group name</p>

<p><a href="http://jsfiddle.net/UCNJ8/" rel="nofollow">http://jsfiddle.net/UCNJ8/</a></p>

<pre><code>$('&lt;select&gt;&lt;/select&gt;').appendTo('body').append('&lt;option value="0"&gt;test&lt;/option&gt;')
    .append($('&lt;optgroup&gt;group&lt;/optgroup&gt;')
            .append('&lt;option value="1"&gt;group test&lt;/option&gt;'));
</code></pre>
