Sets or retrieves the mouse button pressed by the user.
HRESULT value = object.put_button( v);HRESULT value = object.get_button(* p);
Default. No button is pressed.
Left button is pressed.
Right button is pressed.
Left and right buttons are both pressed.
Middle button is pressed.
Left and middle buttons both are pressed.
Right and middle buttons are both pressed.
All three buttons are pressed.
This property is used with the HTMLFrameSiteEvents::onmousedown, HTMLFrameSiteEvents::onmouseup, and HTMLFrameSiteEvents::onmousemove events. For other events, it defaults to 0 regardless of the state of the mouse buttons.