Template rendering

<form method="POST" action="/registration">
    {# Render all fields + CSRF automatically #}
    {% form.registration_form %}
    <button type="submit">Sign up</button>
</form>

<form method="POST" action="/registration">
    {# CSRF always included automatically — field by field or full render #}
    {% form.registration_form.username %}
    {% form.registration_form.email %}
    {% form.registration_form.password %}

    <button type="submit">Sign up</button>
</form>

{# Runique tag — renders the flash messages #}
{% messages %}

{# What it renders (internal message.html): #}
{% for message in messages %}
    <div class="message message-{{ message.level }}">
        {{ message.content }}
    </div>
{% endfor %}

{# message.level: success, error, info or warning #}