WebVTT regionsWebVTT regions set the areas of the video where captions or subtitles should be rendered, such as placing roll-up captions used for live captions.limitedhttps://w3c.github.io/webvtt/#regionshttps://developer.mozilla.org/docs/Web/API/VTTRegionapi.VTTCue.regionapi.VTTRegionapi.VTTRegion.VTTRegionapi.VTTRegion.idapi.VTTRegion.linesapi.VTTRegion.regionAnchorXapi.VTTRegion.regionAnchorYapi.VTTRegion.scrollapi.VTTRegion.viewportAnchorXapi.VTTRegion.viewportAnchorYapi.VTTRegion.widthhttps://nowyoucanuse.com/features--webvtt-regions.html