Classes get stripped out: why?

Question

I am pasting the following code into the text editor.

<ul class="faqs">    
<li class="navbookmark"><a href="#er1">ABC</a></li>
</ul>

After the initial save everything looks fine in preview mode. However, if I go back in to edit the page, the styles applied to ul and li tags get stripped out, and the source looks like this.

<ul>
    <li><a href="#er1">ABC</a></li> 
</ul>

How do I prevent this from happening?

Answer 1

I haven't met this problem before. I did Google search and found this link Classes being stripped in CKeditor. Maybe your problems come from CKeditor and you just configure the allowedContent for CKeditor.