title: getAttributeNode() and getAttributeNodeNS() warnings
body: <p>My page opens properly but in FF I'm continuously getting warning</p>
  
  <pre><code>[10:44:54.904] Use of getAttributeNode() is deprecated. Use getAttribute() instead. @ http://localhost/admin/?page=add#
  [10:46:23.828] Use of getAttributeNodeNS() is deprecated. Use getAttributeNS() instead. @ http://localhost/admin/?page=add
  </code></pre>
  
  <p>Btw i'm using CKeditor. What does mean that warning? and how to fix it?
  <img src="https://i.stack.imgur.com/Bqdcp.png" alt="enter image description here"></p>