The Natural Philosopher wrote:

Chris J Dixon wrote:

AIUI, it is the web site that has the strict policy,

no. it is a setting in the browser.

No, its a configuration option in the webserver that the browser obeys,
e.g. this page shows how to configure it for apache, nginx, iis etc

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options