getPreferredTextTracks
Description
Returns the current list of preferred text tracks - by order of preference.
This returns the data in the same format that it was given to either the
preferredTextTracks constructor option or the last setPreferredTextTracks if
it was called:
{
  language: "fra", // {string} The wanted language
                   // (ISO 639-1, ISO 639-2 or ISO 639-3 language code)
  closedCaption: false // {Boolean} Whether the text track should be a closed
                       // caption for the hard of hearing
}
Syntax
const preferences = player.getPreferredTextTracks();
- return value 
Array.<Object|null>