Available on js
@:value(cast "alternate")@:impl@:enuminlineread onlyALTERNATE:PlaybackDirection = "alternate"
@:value(cast "alternate-reverse")@:impl@:enuminlineread onlyALTERNATE_REVERSE:PlaybackDirection = "alternate-reverse"
@:value(cast "normal")@:impl@:enuminlineread onlyNORMAL:PlaybackDirection = "normal"
@:value(cast "reverse")@:impl@:enuminlineread onlyREVERSE:PlaybackDirection = "reverse"