Свойство onDurationChange
переопределено
Реализация
ElementStream<Event> get onDurationChange =>
durationChangeEvent.forElement(this);
© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-html/Element/onDurationChange.html
