Type guard for a DOM cue that is a VTTCue (and so carries the WebVTT layout properties). On platforms without VTTCue, cues are plain TextTrackCues that cannot be styled.
VTTCue
TextTrackCue
Type guard for a DOM cue that is a
VTTCue(and so carries the WebVTT layout properties). On platforms withoutVTTCue, cues are plainTextTrackCues that cannot be styled.