ResourceManager in MasterPage, does not show the correct HTML in a Content Page

[rookie]

Hello, this is my proble, I have a master page, in this page I have the ext:ResoureManager, when I put some HTML in a content page, the HTML shows, but in the rigth way, does not show Bold, bullets, I know is the resourse manager because without it, the HTML shows fine.
Anybody have an idea why is this ?

I want this HTML

<p>Este es la practica 6</p>  <blockquote>  <p>Vale 10 de la nota final</p>  </blockquote>  <ul style="list-style-type: circle;">  <li><strong>portada</strong></li>  </ul>  <ul style="list-style-type: circle;">  <li><em>introducion</em></li>  </ul>  <ul style="list-style-type: circle;">  <li><span style="text-decoration: underline;">Conclusiones</span></li>  </ul>

[Vladimir]

ExtJS resets default browser css rules (it is removed in ExtJS 4.2.0 (Ext.Net 2.2.0))
I suggest to wrap your html content by div element with 'x-html' class name