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[Exposed=(Window, Worker), Pref="dom.enable_web_task_scheduling"]
interface TaskPriorityChangeEvent : Event {
constructor (DOMString type , TaskPriorityChangeEventInit priorityChangeEventInitDict);
readonly attribute TaskPriority previousPriority;
};
dictionary TaskPriorityChangeEventInit : EventInit {
required TaskPriority previousPriority;
};