How many years we are seeing the alert(1) POC right? Seems like it is going to get dead. Google Chrome has decided to tackle this by disabling alert for cross-domain iframe.
After Chrome 92 , no alert() based XSS POC won’t be there. A simple easy, alternative for alert() is print()
Reference : alert() is dead, long live print() | PortSwigger Research
Please note, we can still use alert if there is no iframe involved.