video.html

<video controls preload="metadata" autoplay loop muted poster="poster_image.png">
  <source src="video_file.mp4" type="video/mp4">
  <source src="video_file.ogg" type="video/ogg">
  <!--
  Accessibility: Include valid WEBVTT caption file(s)
  https://developer.mozilla.org/en-US/Apps/Build/Audio_and_video_delivery/Adding_captions_and_subtitles_to_HTML5_video
  https://quuz.org/webvtt/
   -->
   <track label="English" kind="subtitles" srclang="en" src="subtitles-en.vtt" default>
   <track label="Director's Commentary In German" kind="captions" srclang="de" src="commentary-de.vtt">
</video>