Execute the event handler during the TrickleDown propagation phase if the event tricklesDown and the element is a parent of the event's target, or if the callback is registered directly on the event's target.
Handlers that use TrickleDown.TrickleDown are executed before those
that use TrickleDown.NoTrickleDown.
Additional resources: EventBase.tricklesDown, PropagationPhase.TrickleDown