webvtt1 library Null safety

WebVTT: The Web Video Text Tracks Format

https://w3c.github.io/webvtt/

Classes

VTTCue
The interface—part of the API for handling WebVTT (text tracks on media presentations)—describes and controls the text track associated with a particular <track> element.
VTTRegion
The interface—part of the API for handling WebVTT (text tracks on media presentations)—describes a portion of the video to render a VTTCue onto.

Enums

AlignSetting
AutoKeyword
DirectionSetting
LineAlignSetting
PositionAlignSetting
ScrollSetting