title: How to select child elements under id in jQuery
body: <p>Sample code:</p>
  
  <pre><code>&lt;div id='container'&gt;
    &lt;h1&gt;heading 1&lt;/h1&gt;
    &lt;h2&gt;heading 2&lt;/h2&gt;
    &lt;p&gt;paragraph&lt;/p&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I would like a jQuery equivalent of this CSS selector to select the <code>h1</code> element under the <code>div</code>:</p>
  
  <pre><code>#container h1 {}
  </code></pre>