Respuesta :

Clicking the topbutton button is an illustration of a click event.

When the topbutton is clicked once, the display output is cat dog bird

From the program, we have the following highlights

  • When any button is clicked, the program displays cat and bird, in that order
  • The topbutton click event displays dog

Hence, clicking the topbutton button once, will display cat dog bird

Read more about click events at:

https://brainly.com/question/18473077