- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
The web view invoking the delegate method.
The message to be displayed.
The completion handler to call after the alert panel has been dismissed.
For user security, implementations of this method should call attention to the fact that a specific website controls the content in this panel. A simple formula for identifying the controlling website is
frame. The panel should have a single OK button.