Parameters

1. eventType {String}:

   The type of the event to virtually bind to delegates

2. selector {String}:

   A CSS selector that matches all intended delegates

3. handler {function(event)}:

   The function to call when the event is dispatched

   Add an event as in [can-util/dom/events/events.addEventListener addEventListener] but with a selector matching child nodes ("delegates") for which the event should fire.

   Delegate events are limited to firing in the bubble phase.