Use this enum to specify during which propagation phase the event handler is executed.
Additional resources: PropagationPhase, CallbackEventHandler.RegisterCallback_1
| NoTrickleDown | Execute the event handler during the BubbleUp propagation phase if the event bubbles and the element is a parent of the event's target, or if the callback is registered directly on the event's target. |
| TrickleDown | 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. |