Some youtube videos allows you to watch them with HTML5, some give you the message "The Adobe Flash Player is required for video playback. Get the latest Flash Player". I just discovered how to watch any video with HTML5: https://www.youtube.com/watch?v=kzgBcSHQDAs change the "watch?v=" to "/embed/" https://www.youtube.com/embed/kzgBcSHQDAs