Make HTML audio and video work for everyone: captions, transcripts and audio description, keyboard-friendly controls, autoplay and audio control, reduced motion, flashing and seizure safety, labelling embedded players, and a practical checklist for every kind of media, with live demos.
Learn how to add and write good captions for HTML video: the track element with kind captions, what captions must include (speech, speakers, sounds), timing and reading speed, line length, styling and contrast, open versus closed captions, reviewing automatic captions, and common mistakes, with live checkers.
Learn the HTML track element: adding captions, subtitles, descriptions, chapters and metadata to audio and video with kind, src, srclang, label and default, how WebVTT files work, the TextTrack JavaScript API and cuechange event, cross-origin rules, and common mistakes, with live demos.