onLoadStart property

Stream<ProgressEvent> onLoadStart
@DocsEditable(), @DomName('XMLHttpRequestEventTarget.onloadstart'), @Experimental()

Stream of loadstart events handled by this HttpRequestEventTarget.

Implementation 

@DomName('XMLHttpRequestEventTarget.onloadstart')
@DocsEditable()
@Experimental() // untriaged
Stream<ProgressEvent> get onLoadStart => loadStartEvent.forTarget(this);