The specific event callback to to be removed
Optional evtNamespace: string | string[][Optional] Namespace(s) uniquely identified and removed based on this namespace.
true - when at least one of the events was registered otherwise false
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Remove any matching 'beforeunload', 'unload' and 'pagehide' events that may have been added via addEventListener, addEventListeners, addPageUnloadEventListener or addPageHideEventListener.