Test Description: MouseEvent.button value for mouseup event is based on current button pressed.

            
            
            Steps:
            1) Move the mouse pointer to the above textbox
            2) Click the mouse button in this order: Left Button, Middle Button, Right Button
            3) Click here to test again if not following the steps exactly
        

Test passes if the word "PASS" appears below after following the above steps.

Test result:
FAIL