Hello guys!
I want to setup a direct iframe to my website on facebook. So I would just inset the location and I would work.

BUT: Would I be able to show my website in a iframe if my site is made in wordpress or Joomla?
- And does it work with basic html also or does it need to be php?

.. Do I need some specific files to make it work?

An iframe displays a webpage, which is always html. CMS scripts like Wordpress and Joomla and the php scripting language itself all create html code and deliver that html to the browser.

So what the other site opens up inside the iframe is always html.

So, to answer your question, any web page made from WordPress, Joomla etc should open fine in an iframe.

I'm not familiar with how faceBook handles iframes itself and defer to you on that. It sounds like you know they do.

I thin you are fine displaying a webpage in a frame