Closed captioning, itís not just for accessibility! TextTrack in HTML5 video

Closed captioning was originally conceived for hard of hearing viewers and offering programming in other languages without re-dubbing. Captioning can be a word for word transcription or translation of screen content, or it can be used for additional content like titles, locations, or commentary. Source: Closed captioning, it
This article gives you the code to create closed captioning in HTML5 video

Closed captioning, it