dart:html

onLoadStart property

Stream<ProgressEvent> onLoadStart

Stream of loadstart events handled by this HttpRequestEventTarget.

Source 

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

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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-html/HttpRequestEventTarget/onLoadStart.html