renderer.html

{{extend 'game/index.html'}} {{block game_css}}
<link
  rel="stylesheet"
  type="text/css"
  href="{{=URL('static/game/bootstrap', 'renderer.css')}}"
/>
{{end game_css}} {{block game_js}}
<script
  src="{{=URL('static/game/bootstrap','renderer.js')}}"
  type="text/javascript"
></script>
{{end game_js}}