String returnValue

Source 

@DomName('BeforeUnloadEvent.returnValue')
@DocsEditable()
String get returnValue => _blink.BlinkBeforeUnloadEvent.instance.returnValue_Getter_(this);
void returnValue=(String value)

Source 

@DomName('BeforeUnloadEvent.returnValue')
@DocsEditable()
set returnValue(String value) => _blink.BlinkBeforeUnloadEvent.instance.returnValue_Setter_(this, value);