Enabling cross-origin communication between Window objects | by Pushkar Garg | WhatfixEngineeringBlog | Medium
CSP Issue attempting to access an iframe from a different origin: "Blocked a frame with origin from accessing a cross-origin frame" - k6-browser - Grafana Labs Community Forums
Message passing between two browser windows using Iframe and localStorage | by Ashok Kumar | Medium
Fetch: Cross-Origin Requests
iFrame sandbox permissions tutorial | Google Cloud Blog
Using iFrame for Cross-domain Communication in Enterprise Networks