title: Filter HTML Content with JQuery but exclude certain elements
body: <p>I have a list of posts and I'd like to remove all text/HTML content except the content set "strong".</p>
  
  <p><strong>Original</strong></p>
  
  <pre><code>&lt;li id="post"&gt;
      &lt;p&gt;
          &lt;strong&gt;Reality&lt;/strong&gt;
      &lt;/p&gt;
      &lt;p&gt;
          Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
      &lt;/p&gt;
  &lt;/li&gt;
  &lt;li id="post"&gt;
      &lt;p&gt;
          &lt;strong&gt;Buzz&lt;/strong&gt;&lt;br&gt;
          &lt;br&gt;
          Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
      &lt;/p&gt;
  &lt;/li&gt;
  &lt;li id="post"&gt;
      &lt;p&gt;
          &lt;strong&gt;Innovation&lt;/strong&gt;&lt;br&gt;
          &lt;br&gt;
          Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
      &lt;/p&gt;
  &lt;/li&gt; 
  </code></pre>
  
  <p><strong>Desired Result</strong></p>
  
  <pre><code>&lt;li id="post"&gt;
          Reality
  &lt;/li&gt;
  &lt;li id="post"&gt;
          Buzz
  &lt;/li&gt;
  &lt;li id="post"&gt;
          Innovation
  &lt;/li&gt;
  </code></pre>
  
  <p>How can I do this using JQuery?</p>