Much harder than it sounds if you care about live streaming, video playlists, and cross-browser support. Don't forget to mention the 3 big subtitles formats (60

Much harder than it sounds if you care about live streaming, video playlists, and cross-browser support. Don't forget to mention the 3 big subtitles formats (608/708/VTT) and some smaller ones (SRT/DFXP). Also, here's a fun quirk of the subtitles track element: you cannot remove a track once added. Another obstacle for full FCC compliance: styling. You must allow users to style your captions. Captions are put in the shadow DOM - Firefox does not allow you to style the shadow dom. Don't forget to add IE into the mix!