Cross-Browser support with Cross-Origin isolation

Cross-origin window interactions, essential for processes like OAuth and payments, face challenges due to a lack of support for cross-origin isolation, despite discussions around solutions like COOP: same-origin-allow-popups. While APIs such as FedID and WebPayments promise future advancements in enabling robust OAuth and payment flows without pop-ups, they are not yet available, leaving developers reliant on interim solutions. One such temporary measure is registering for an origin trial in Chrome, which provides a temporary exception, though this option is not available in other browsers like Firefox or Safari. Chrome's origin trial will remain in place until a permanent solution is implemented.