bool open

Source 

@DomName('HTMLDialogElement.open')
@DocsEditable()
bool get open => _blink.BlinkHTMLDialogElement.instance.open_Getter_(this);
void open=(bool value)

Source 

@DomName('HTMLDialogElement.open')
@DocsEditable()
set open(bool value) =>
    _blink.BlinkHTMLDialogElement.instance.open_Setter_(this, value);