I'm developing an iframe, but impossible to go fullscreen from inside the iframe. I can go fullscreen with the fullscreen API from inside the iframe when the iframe and the hosting website are on the same domain. I can also trigger fullscreen from outside the iframe.
But I can't trigger fullscreen from inside the iframe when the hosting website is on a different domain, because of cross-domain policy.
However, YouTube can do this. Do you know how they do it ? Impossible to find out their workaround on the web.
Thanks in advance !