2.3.4.3 onbeforeactivate
onbeforeactivate of
type Function
Occurs immediately before the object is set as the active element.
To invoke, click an element (other than the active element), use the keyboard to move focus, or invoke the focus() method.
Bubbles: Yes
Cancelable: Yes
Context Info: fromElement, srcElement
This attribute is an extension to HTMLElement.
See also onactivate, onbeforedeactivate.