html - Can't show some websites in iframe tag

Question

I am trying to develop a page in which I can show more than 3 website at a time, as below:

<ul>
   <li>
      <iframe src="http://www.facebook.com/" /><p> iframe is not supported</p>
   </li>
   <li>
      <iframe src="http://www.yahoo.com/"></iframe>
   </li>
   <li>
      <iframe src="http://www.google.co.in"></iframe>
   </li>
</ul>

The problem is that it shows yahoo.com and google.co.in, but does not display Facebook in the iframe.

Answer 1

You have to check for HTTP response header X-Frame-Option of those sites. if its value is "DENY or SAMEORIGIN", then you can not load those website in the iframes.

DENY = No one can load the website in iframe. Even the same domain page wont be able to load. SAMEORIGIN = only a page which is in same domain can load this website in iframe.