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The nice thing about Django templates

There's "polymorphism":

In a.html:

{% block outer %}
    This is the outer block.
    {% block inner %}
    {% endblock %}
{% endblock %}

In b.html:

{% extends 'a.html' %}

{% block outer %}
    This is the subtemplate.
    {{ block.super }}
{% endblock %}

{% block inner %}
    This is the inner block.
{% endblock %}

This will render as expected (block.super will contain the inner block of the child template as well).