title: JQuery $("#content").append not working
body: <p>I'm trying to learn JQuery, but not doing well. Currently, I'm trying to learn how to use <code>.append</code> to have Ajax functionality which allows one to view new dynamic content without reloading. When I try the following, however, nothing occurs.</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  
  &lt;html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"&gt;
      &lt;head&gt;
          &lt;title&gt;JQuery Test&lt;/title&gt;
          &lt;script src="http://code.jquery.com/jquery-2.0.3.min.js"&gt;&lt;/script&gt;
      &lt;/head&gt;
      &lt;body&gt;
          &lt;div id="content"/&gt;
          &lt;script type="text/javascript"&gt;
  function callback() {
      $("#content").append($("qwerty"));
  };
  $(document).ready(function() {
      //window.setTimeout(callback, 100);
      callback();
  });
          &lt;/script&gt;
      &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>To the best of my knowledge, this should make "qwerty" appear as if I has simply done <code>&lt;div id="content"&gt;qwerty&lt;/div&gt;</code>, but instead I get a blank page. If I replace the <code>.append</code> call with <code>alert("qwerty")</code>, it is properly displayed. What am I doing wrong?</p>