Свойство onDragLeave
Stream<MouseEvent> onDragLeaveПоток событий dragleave, обрабатываемых этим документом.
Исходный код
@DomName('Document.ondragleave')
@DocsEditable()
Stream<MouseEvent> get onDragLeave => Element.dragLeaveEvent.forTarget(this);
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https://api.dartlang.org/stable/1.24.3/dart-html/Document/onDragLeave.html