This web page uses Javascript to bust out of any iframe that it is loading into, after a short delay. NB using Javascript for this is no longer state-of-the-art; using X-Frame-Options or CSP is better.

To see how this works - or not -, just load the web pages framebusting1.html and framebusting2.html which include this page inside an iframe.

Below some animation to check if javascript is executed. Reload the page to re-active the animation.