CORS & X-Frame-Options
X-Frame-Options
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
https://codepen.io/webgeeker/full/MLLLoY
X-Frame-Options & iframe & CORS
https://github.com/xgqfrms/FEIQA/issues/23
https://*.com/questions/6666423/overcoming-display-forbidden-by-x-frame-options
Clickjacking
https://en.wikipedia.org/wiki/Clickjacking