Toast

c.Toast shows a message near the bottom of the window for a few seconds, as the outcome of what the user just did:

if ui.Button(c, "Save").Clicked() {
	app.save()
	c.Toast("Saved")
}

c.ToastAction shows one with a button, as Undo after deleting, for longer: the button runs the action, on the main thread as the view does, and closes the toast; Tab reaches it.

app.trash(note)
c.ToastAction("Note deleted", "Undo", func() { app.restore(note) })

A message already showing shows anew; others stack above it. A toast stays while the pointer rests on it, and fades in and out.

Accessibility

Screen readers read a toast's text as it shows (see announcements); assistive technology sees it as a status, which holds its button.