Check out http://docs.webplatform.org/wiki/concepts/VTT_Captioning to gain a good current overview of WebVTT and its use in browsers.

The Timed Text WG charter has been updated in March 2014. It includes delivery of a WebVTT 1.0 specification as a W3C Recommendation. This means, a snapshot of the WebVTT specification has been taken, FSA commitments have been made, and … Continue reading →