Свойство onPopState
ElementStream<PopStateEvent> onPopStateПоток popstate событий, обработанных этим элементом BodyElement.
Исходный код
@DomName('HTMLBodyElement.onpopstate')
@DocsEditable()
ElementStream<PopStateEvent> get onPopState => popStateEvent.forElement(this);
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https://api.dartlang.org/stable/1.24.3/dart-html/BodyElement/onPopState.html