Comment by c-smile

In Sciter you do not need any preprocessor at all, not even JS in your HTML:

    <style>
      div.beer {
        prototype: Beer url(/components/beer.js);
      }
    </style>
    <body>
       <div class="beer" />
    </body>

After that div.beer element will be instanceof Beer. In this case class Beer used as a [Web-alike] component.