custom Event with isDefaultPrevented()

Step 1:
dispatchEvent(new Event(“customEvent”, false, true )) [Link]
Step 2:
addEventListener( “customEvent”, handler, false, EventPriority.DEFAULT_HANDLER, true );  [Link]
The EventPriority.DEFAULT_HANDLER enables prevent default

 By Implementing these steps – and plus your custom handling for event.isDefaultPrevented()  enables your custom event to be prevented from action. Example: [Link]

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