onError property

Stream<ProgressEvent> onError
@DocsEditable(), @DomName('XMLHttpRequestEventTarget.onerror'), @Experimental()

Stream of error events handled by this HttpRequestEventTarget.

Implementation 

@DomName('XMLHttpRequestEventTarget.onerror')
@DocsEditable()
@Experimental() // untriaged
Stream<ProgressEvent> get onError => errorEvent.forTarget(this);