Flags to describe the characteristics of an event.
| None | Empty value. |
| Bubbles | Event will bubble up the propagation path (i.e. from the target parent up to the visual tree root). |
| Capturable | Event will be sent down the propagation path during the capture phase (i.e. from the visual tree root down to the target parent). |
| Cancellable | Execution of default behavior for this event can be cancelled. |