Fixed #21747 -- Added {% elif %} to template topics guide.

        {% endfor %}

        </ul>

:ttag:`if` and ``else``

:ttag:`if`, ``elif``, and ``else``

    Evaluates a variable, and if that variable is "true" the contents of the

    block are displayed::

        {% if athlete_list %}

            Number of athletes: {{ athlete_list|length }}

        {% elif athlete_in_locker_room_list %}

            Athletes should be out of the locker room soon!

        {% else %}

            No athletes.

        {% endif %}

    In the above, if ``athlete_list`` is not empty, the number of athletes

    will be displayed by the ``{{ athlete_list|length }}`` variable.

    will be displayed by the ``{{ athlete_list|length }}`` variable. Otherwise,

    if ``athlete_in_locker_room_list`` is not empty, the message "Athletes

    should be out..." will be displayed. If both lists are empty,

    "No athletes." will be displayed.

    You can also use filters and various operators in the :ttag:`if` tag::