Interface TextTrackStyleMap

interface TextTrackStyleMap {
    backgroundColor: string | undefined;
    backgroundOpacity: number | undefined;
    edgeStyle: EdgeStyle | undefined;
    fontColor: string | undefined;
    fontFamily: string | undefined;
    fontOpacity: number | undefined;
    fontSize: string | undefined;
    windowColor: string | undefined;
    windowOpacity: number | undefined;
}