mozilla/webvtt — pull request #372 by jbraffoul (2013-04-21 00:37:27+00:00)
Title: add payload unit tests for lang tag

Basic tests for the currently unimplemented tag (#317). Hopefully this will drive support for implementation.

I'm not sure how we want to detect valid BCP47 languages, maybe @rillian, @RickEyre, or @caitp have some ideas.