This event can serve as global event or element event. When you add this event, you can decide if it should serve as a global event.
If the event is a global event, it will be triggered when mouse button is pressed down, no matter where the mouse cursor is.
If the event is an element event (non-global), it will be triggered only when the mouse is pressed down on the element that own this event.
This event is available for page and all elements.