template.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Template of Backbone.js</title>
  </head>
    <!-- Your HTML -->
    <div id="content"></div>

    <!-- Libraries -->
    <script
      src="https://code.jquery.com/jquery-3.4.1.min.js"
      integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo="
      crossorigin="anonymous"
    ></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/json2/20160511/json2.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.4.0/backbone-min.js"></script>
    <script src="http://cdnjs.cloudflare.com/ajax/libs/backbone-localstorage.js/1.0/backbone.localStorage-min.js"></script>
    
    <!-- Javascript code -->
    <script src="app.js"></script>
  </body>
</html>