String regionId

Source 

@DomName('VTTCue.regionId')
@DocsEditable()
@Experimental() // untriaged
String get regionId => _blink.BlinkVTTCue.instance.regionId_Getter_(this);
void regionId=(String value)

Source 

@DomName('VTTCue.regionId')
@DocsEditable()
@Experimental() // untriaged
set regionId(String value) =>
    _blink.BlinkVTTCue.instance.regionId_Setter_(this, value);