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 how to add subtitles in several languages to HTML video: track elements with kind subtitles, srclang and native-language labels, language codes, translation tips, right-to-left and Asian scripts, choosing a language with JavaScript, and common mistakes, with a live multi-language demo.
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.