OptionaladaptiveNot supported with NATIVE or EMBEDDED handlerType
OptionalfallbackOptionalfileOptionalforceWhen true, disables all automatic media probing / metadata HTTP requests for this track
(file format detection, audio channel count, etc.). fileFormatType must be provided
explicitly, or loading fails — anything else that would normally be probed falls back to a
default value instead.
OptionalhandlerOptionalrenderingNot supported with NATIVE or EMBEDDED handlerType
Optionaltime
Load options for text tracks.