asciinema.org/app/views/asciicasts/_player.html.slim

.player

javascript:
  $(function() {
    var playerClass = #{player_class.html_safe};
    window.player = new playerClass({
      el: $('.player'),
      speed: #{speed},
      benchmark: #{benchmark},
      model: new AsciiIo.Asciicast(#{asciicast.html_safe}),
      containerWidth: #{container_width || 'null'},
      rendererClass: #{renderer_class.html_safe},
      autoPlay: #{auto_play},
      hud: #{hud}
    });
  });