Re:Only 90s Web Developers Remember This
by beejiu on Thursday January 25, 2024 @05:29AM
(#39128089)
You could even do realtime stuff by leaving the HTTP socket open and writing out script tags when you needed to. https://en.wikipedia.org/wiki/Comet_(programming)
Or having some javascript code in the page loaded by the iframe which could call some parent. function.