Свойство onDurationChange
переопределение
Реализация
Stream<Event> get onDurationChange =>
Element.durationChangeEvent.forTarget(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/Window/onDurationChange.html
