title: How to let CKEditor allow data-label tags?
body: <p>I want my CKEditor to allow data-label tags, but for some reason the code that is supposed to allow it doesn't work.</p>
  
  <p>Here is my current code:</p>
  
  <pre><code>&lt;form method="post"&gt;
  &lt;label for="pname"&gt;Page name:&lt;/label&gt;&lt;br /&gt;
  &lt;input type="text" value="&lt;?php echo $fetchp['pname']; ?&gt;" name="pname" autocomplete="off" /&gt;&lt;hr /&gt;
  &lt;label for="pcontent"&gt;Page content:&lt;/label&gt;&lt;br /&gt;
  &lt;textarea name="pcontent" id="pcontent" rows="10" cols="80"&gt;&lt;?php echo $fetchp['pcontent']; ?&gt;&lt;/textarea&gt;&lt;br /&gt;
  &lt;script&gt;
      CKEDITOR.replace('pcontent', {enterMode : CKEDITOR.ENTER_BR, extraAllowedContent: 'section article header nav aside[lang,foo] data-label'});
  &lt;/script&gt;
  &lt;input type="submit" value="Submit" /&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>Don't worry about that $fetch thing, that all works fine.</p>