Fires after an object has yielded activation to another object because the user clicked on another element, tabbed to another element, or a script invoked the setActive( ) or focus( ) method of another element. If an element has focus and is the active element, the following event sequence fires en route to losing focus: onbeforedeactivate, ondeactivate, and onblur. To prevent an element from deactivating or losing focus, cancel the companion onbeforedeactivate event.