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/Dart 2

dart:html

onError property

Stream<Event> onError

Implementation 

Stream<Event> get onError => errorEvent.forTarget(this);

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-html/Sensor/onError.html