asciinema.org/app/views/asciicasts/_download.html.erb

<div class="modal fade" id="download-modal" tabindex="-1" role="dialog">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal"><span>&times;</span></button>
        <h4 class="modal-title" id="myModalLabel">Download this recording</h4>
      </div>
      <div class="modal-body">
        <p>
          <% if page.can_replay_in_terminal? %>
            You can download this recording in <a href="https://github.com/asciinema/asciinema/blob/master/doc/asciicast-v1.md">asciicast format</a>, as a .json file:
          <% else %>
            You can download this recording as a .json file.
          <% end %>
        </p>

        <a href="<%= asciicast_url(format: :json, dl: 1) %>" class="btn btn-primary" download="<%= page.asciicast_download_filename %>" rel="nofollow">Download</a>

        <% if page.can_replay_in_terminal? %>
          <h2>Replay in terminal</h2>
          <p>
            You can replay this recording in your terminal with <code>asciinema play</code> command:
          </p>

          <pre><code>asciinema play <%= page.asciicast_download_filename %></code></pre>

          <p>
            If you don't have asciinema cli installed then <a href="https://asciinema.org/docs/installation">see installation instructions</a>.
          </p>

          <hr>
        <% end %>

        <h2>Use with stand-alone player on your website</h2>

        <p>
          Download asciinema player from <a href="https://github.com/asciinema/asciinema-player/releases">player's releases page</a> (you only need <code>.js</code> and <code>.css</code> file), then use it like this:
        </p>

        <pre><code>&lt;html>
&lt;head>
  &lt;link rel="stylesheet" type="text/css" href="/asciinema-player.css" />
  &lt;script src="/asciinema-player.js">&lt;/script>
&lt;/head>
&lt;body>
  &lt;div id="player-container">&lt;/div>
  &lt;script>
    asciinema_player.core.CreatePlayer('player-container', '/<%= page.asciicast_download_filename %>', { width: <%= page.asciicast_width %>, height: <%= page.asciicast_height %> });
  &lt;/script>
&lt;/body>
&lt;/html></code></pre>

        <p>See <a href="https://github.com/asciinema/asciinema-player">asciinema player README</a> for full usage instructions.</p>
      </div>
    </div>
  </div>
</div>