[Type] ErrorCallback [Nullable] ✘ [Optional] ✘ [Description] This argument holds a callback object for failure of asynchronous requests to the property. The errorCallback object implements the ErrorCallback interface and holds a handleEvent operation that needs to be called if an attempt fails. This handleEvent operation needs to be called with a new DOMString representing the status code of the error (see Section 4.7 for details). [Parameter] 
errorCallback
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