div-0
div-1
div-2
div-3

Observed events

var events = 'click mouseover mouseout';
$('.div-1').on(events, testOne);
$('.div-0').on(events, '.div-1', testTwo);

Inside function testOne (e)

e.currentTarget = ?
e.delegateTarget = ?
e.relatedTarget = ?
e.target = ?
e.type = ?

Inside function testTwo (e)

e.currentTarget = ?
e.delegateTarget = ?
e.relatedTarget = ?
e.target = ?
e.type = ?

Note: e.delegateTarget is a jQuery event property; it is not present in native JavaScript