With CHROME BROWSER, try to paste some HTML text inside a literal tag. The text will be pasted outside the literal tag.

STEPS TO REPRODUCE

1. Edit content.ini.append.php and add the following code.

   [literal]
   AvailableClasses[]
   AvailableClasses[]=html
   CustomAttributes[]
   

2. Create a new article and click the button to add a new literal tag.
3. Yet in the literal tag window, select HTML class and click OK button.
4. You will see a purple line in the body of the article. Click it to make sure it has the focus.
5. Copy the code below from a plain text source and paste it inside the literal tag

   <div>
   <table>
   <tr>
   <td><b>Head #001</b></td>
   <td><b>Head #002</b></td>
   </tr>
   <tr>
   <td><b>Test #001</b></td>
   <td><b>Test #002</b></td>
   </tr>
   </table>
   </div>
   

6. The code was paste outside the literal tag, as you can confirm disabling the online editor.

   <literal class="html"> </literal>
   
   &lt;div&gt;
   &lt;table&gt;
   &lt;tr&gt;
   &lt;td&gt;&lt;b&gt;Head #001&lt;/b&gt;&lt;/td&gt;
   &lt;td&gt;&lt;b&gt;Head #002&lt;/b&gt;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr&gt;
   &lt;td&gt;&lt;b&gt;Test #001&lt;/b&gt;&lt;/td&gt;
   &lt;td&gt;&lt;b&gt;Test #002&lt;/b&gt;&lt;/td&gt;
   &lt;/tr&gt;
   &lt;/table&gt;
   &lt;/div&gt;
   

Please notice that, if the html code was copied from a browser instead plain text, the results will be slightly different: the literal tag will be duplicated, without the HTML class, and the code will be pasted inside this second literal tag