I can't use strong tag in wysiwyg I watch Introduction Advanced Theming in Drupal 7 (drupalize.me), and I create custom theme frot that video tutorial. I can't use &lt;strong&gt; and &lt;em&gt; in CkEditor. I can use only &lt;b&gt; and &lt;l&gt;, but CkEditor create &lt;strong&gt; and &lt;em&gt;. That tags has no effect when I save my node.
Why? What is wrong? When I change the theme to Bartic, everything works OK, but in the custom theme from that video tutorial, those two tags are not rendered as I would expect.
CSS resets usually take the emphasis off of &lt;strong&gt; and &lt;em&gt; tags by default.

All you need to do is add a rule like this to your main style sheet (main.css):

strong {font-weight: bold;}
em {font-style: italic;}


That will re-reset the &lt;strong&gt; and &lt;em&gt; tags to display as you'd normally expect.