title: How to define allowed tags in CKEditor?
body: <ul>
  <li><p>Sometimes users copy and paste text from different sources to CKEditor, but I want to restrict what tags they can copy to CKEditor.</p></li>
  <li><p>I only need to use certain tags in CKEditor: The list tag, break tag, etc...</p></li>
  <li><p>Can I define them &amp; disable the other tags in CKEditor?</p></li>
  </ul>