CodeMirror: Jinja2 mode

 
<html style="color: green">
  <!-- this is a comment -->
  <head>
    <title>Jinja2 Example</title>
  </head>
  <body>
    <ul>
    {# this is a comment #}
    {%- for item in li -%}
      <li>
        {{ item.label }}
      </li>
    {% endfor -%}
    </ul>
  </body>
</html>