Thanks, I totally missed that the site is intended to be opened in multiple windows/tabs! That lede is buried in the code. Wasn't familiar with BroadcastChanne

Thanks, I totally missed that the site is intended to be opened in multiple windows/tabs! That lede is buried in the code. Wasn't familiar with BroadcastChannel, which allows communication between different ... windows and tabs ... of the same origin https://developer.mozilla.org/en-US/docs/Web/API/BroadcastChannel https://developer.mozilla.org/en-US/docs/Web/API/BroadcastCh...