Use the platform pages together with the Platform Support Matrix when you need the honest current repo runtime status instead of the broader capability contract.
NativeWebView control runtime paths now exist on Windows, macOS, Linux, iOS, Android, and Browser.
NativeWebDialog is intentionally desktop-only in the current repo runtime and is implemented on Windows, macOS, and Linux.
WebAuthenticationBroker now has runtime implementations on Windows, macOS, Linux, iOS, Android, and Browser.