This example to load a url in an iframe works. However when I change url to something like http://www.yahoo.com
the iframe doesn't load antyhing
Here is an example side by side.
In Network tab of developer tools for Chrome, I see that request to Yahoo was cancelled. In FF it doesn't give any errors, just doesn't return any content. IE9 gives a message that It cannot display this content.
This happens in Chrome, FF and IE9 (I haven't tested previous versions of IE).