iframe with external page not working

Question

I\'m tring to embed a webpage in an iframe, but it doesn\'t work at all. internal pages with relative path are displayed normally. but this simple code doesn\'t work:

<

Answer 1

Because the internal page had do something to prevent to be put in iframe.

Maybe a piece of javascript like that

if (window.top != window.self) {window.top.location = window.self.location;}