title: display html tags in ckeditor
body: <p>I am opening the ckeditor with below content as default.</p>
  
  <pre><code>&lt;textarea id="editor1" name="editor1" rows="30" cols="120"&gt;&lt;p&gt;We can use&amp;nbsp;&lt;strong&gt;prettify&amp;nbsp;&lt;/strong&gt;to auto-format the Computer programming code at web page.&lt;/p&gt;
  
  &lt;p&gt;&lt;strong&gt;How to use?&lt;/strong&gt;&lt;/p&gt;
  
  &lt;p&gt;Just add below line;&lt;/p&gt;
  
  &lt;p&gt;&lt;code class="prettyprint"&gt;&lt;span style="line-height: 1.6em;"&gt;&amp;lt;script src=&amp;quot;https://google-code-prettify.googlecode.com/svn/loader/run_prettify.js&amp;quot;&amp;gt;&amp;lt;/script&amp;gt;&lt;/span&gt;&lt;/code&lt;/p&gt;
  
  &lt;p&gt;&lt;span style="line-height: 1.6em;"&gt;Then, put the code line in below tab;&lt;/span&gt;&lt;/p&gt;
  
  &lt;p&gt;&lt;code class="prettyprint"&gt;&amp;lt;code class=&amp;quot;prettyprint&amp;quot;&amp;gt;...&amp;lt;/code&amp;gt;&lt;/code&gt;&lt;/p&gt;
  
  &lt;p&gt;&lt;span style="color: rgb(0, 0, 0); font-family: monospace; font-size: medium; line-height: normal;"&gt;or,&lt;/span&gt;&lt;/p&gt;
  
  &lt;p&gt;Download the complete code files&amp;nbsp;from&amp;nbsp;&lt;a href="https://code.google.com/p/google-code-prettify/"&gt;https://code.google.com/p/google-code-prettify/&lt;/a&gt;(even can learn more about prettify)&amp;nbsp;&amp;nbsp;to your server and change above script tag line like below;&lt;/p&gt;
  
  &lt;p&gt;&lt;code class="prettyprint"&gt;&amp;lt;script src=&amp;quot;path/to/directory/run_prettify.js&amp;quot;&amp;gt;&amp;lt;/script&amp;gt;&lt;/code&gt;&lt;br /&gt;&amp;nbsp;&lt;/p&gt;
  &lt;/textarea&gt;
  &lt;script&gt;CKEDITOR.replace( "editor1");&lt;/script&gt;
  </code></pre>
  
  <p>But, in output HTML tag codes are missing. Output is below(under lines);</p>
  
  <hr>
  
  <p>We can use prettify to auto-format the Computer programming code at web page.</p>
  
  <p>How to use?</p>
  
  <p>Just add below line;</p>
  
  <p>Then, put the code line in below tab;</p>
  
  <p>...</p>
  
  <p>or,</p>
  
  <p>Download the complete code files from <a href="https://code.google.com/p/google-code-prettify/(even" rel="nofollow noreferrer">https://code.google.com/p/google-code-prettify/(even</a> can learn more about prettify)  to your server and change above script tag line like below;</p>
  
  <hr>
  
  <p>Expecting output:
  <img src="https://i.stack.imgur.com/SkRii.jpg" alt="expected output">
  Please help, where I am missing.</p>