bool defaultValue

Source 

@DomName('HTMLTrackElement.default')
@DocsEditable()
bool get defaultValue =>
    _blink.BlinkHTMLTrackElement.instance.default_Getter_(this);
void defaultValue=(bool value)

Source 

@DomName('HTMLTrackElement.default')
@DocsEditable()
set defaultValue(bool value) =>
    _blink.BlinkHTMLTrackElement.instance.default_Setter_(this, value);