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Editorial Team
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Asked: 2026-05-30T22:51:46+00:00

The example code from the official jinja site: {% if not standalone %}{% extends

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The example code from the official jinja site:

{% if not standalone %}{% extends 'master.html' %}{% endif -%}
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<title>{% block title %}The Page Title{% endblock %}</title>
<link rel="stylesheet" href="style.css" type="text/css">  
{% block body %}
  <p>This is the page body.</p>
{% endblock %}

As I understand it, when standalone is true the following code is printed :

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<title>{% block title %}The Page Title{% endblock %}</title>
<link rel="stylesheet" href="style.css" type="text/css">  
{% block body %}
  <p>This is the page body.</p>
{% endblock %}

And when standalone is false, this is printed :

{% if not standalone %}
 <<master.html's code>>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<title>{% block title %}The Page Title{% endblock %}</title>
<link rel="stylesheet" href="style.css" type="text/css">  
{% block body %}
  <p>This is the page body.</p>
{% endblock %}

This seems is very weird. I am clearly missing something obvious, what is it ?

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1 Answer

  1. Editorial Team

    The thing that is not immediately clear from the documentation is that when a template extends another template only the blocks in the child template that have a counterpart in the parent template(s) are rendered. Everything else is dropped.

    So in non-standalone mode:

    {% if not standalone %}
{% only care about blocks also in "master.html" %}
{% endif %}
{# Everything below is ignored #}
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<title>{# The following will be rendered if master has a block named title. #}
{% block title %}The Page Title{% endblock %}
{# All the following will be ignored #}</title>
<link rel="stylesheet" href="style.css" type="text/css">
{# This *may* be rendered, if master.html has a block named "body" #}
{% block body %}
  <p>This is the page body.</p>
{% endblock %}
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