{# The verse select's options. Rendered into the picker by reference.njk, and
   returned on their own by api/reference after a chapter or verse change.
   Both paths must produce the same options for the swap to be seamless. #}
{% for verse in reference.verses -%}
    <option value="{{ verse.id }}"
            {%- if verse.id == reference.verse %} selected{% endif %}>{{ verse.label }}</option>
{% endfor -%}