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XMLHttpRequestEventTarget is the interface that describes the event handlers you can implement in an object that will handle events for an XMLHttpRequest.
Contains the function that is called periodically with information about the progress of the request and the progress event is received by this object.
Contains the function that is called if the event times out and the timeout event is received by this object; this only happens if a timeout has been previously established by setting the value of the XMLHttpRequest object's timeout attribute.