LeanBack Player | Test case implementation of WebVTT format (Web Video Text Tracks)

WebVTT subtitle examples with settings: english; arabic; chinese vertical-lr; japanese vertical-lr; english demo; arabic demo vertical(-lr); japanese demo vertical(-lr);
LeanBack Player supports bidirectional text, both right-to-left (RTL) and left-to-right (LTR), fully automaticaly
LeanBack Player supports vertical(-lr) text together with bidirectionality
more informations can be found in the review of the WebVTT format with notes and thoughts about it