Desktop Platforms

Desktop backends expose the richest feature surface in NativeMessageBox.

Windows

Uses TaskDialogIndirect for advanced features and MessageBoxW when a simpler fallback is sufficient.
Supports icons, checkbox verification, secondary content, help links, and timeout handling.
Advanced requests may require an STA thread.

macOS

Uses NSAlert with accessory views for text, password, combo, and checkbox input.
Supports informative and expanded content, help links, and timeout-driven close behavior.
Must execute on the main thread.

Linux

Uses GTK dialogs for the primary path.
Supports multiple buttons, inputs, checkbox state, and secondary content.
Depends on a usable display session; constrained environments may fall back to zenity.

Choosing a Common Denominator

If your app must behave identically across desktop operating systems, build around:

Explicit buttons
Basic icons
Optional checkbox state
Timeout behavior you have tested on all three backends

Then layer text input or help links where they add value.