2 <html{% if lang is defined and lang %} lang="{{ lang }}"{% endif %}>
 
   4                 {% block metas %}<meta charset="UTF-8">{% endblock %}
 
   5                 <title>{% block title %}Welcome!{% endblock %}</title>
 
   6                 {% block stylesheets %}{% endblock %}
 
   9                 {% block body %}{% endblock %}
 
  10                 {% block javascripts %}{% endblock %}