what is a WEBVTT
WebVTT (Web Video Text Tracks) is a W3C standard for displaying timed text in connection with the HTML5 element.n the January 13, 2011 version of the HTML5 Draft Report, the tag was introduced and the specification was updated to document WebVTT cue text rendering rules. The WebVTT specification is still in draft stage but the basic features are already supported by all major browsers.