Available on js
@:value(cast "disabled")@:impl@:enuminlineread onlyDISABLED:TextTrackMode = "disabled"
@:value(cast "hidden")@:impl@:enuminlineread onlyHIDDEN:TextTrackMode = "hidden"
@:value(cast "showing")@:impl@:enuminlineread onlySHOWING:TextTrackMode = "showing"