If you select an element in jQuery by ID is there still a speed improvement by giving it a context?
<p>Imagine this simplified markup:</p>

<pre><code>&lt;div id="header"&gt;
   &lt;!-- Other things.... --&gt;
   &lt;div id="detail"&gt;

   &lt;/div&gt;
&lt;/div&gt;
</code></pre>

<p>and assume you already have this code:</p>

<pre><code>var $hdr = $("#header");
</code></pre>

<p>Is there any speed difference for jQuery to lookup "detail" this way:</p>

<pre><code>var $detail = $("#detail", $hdr);
</code></pre>

<p>vs</p>

<pre><code>var $detail = $("#detail");
</code></pre>

<p>Since detail is being looked up by ID?</p>
