<tr>
    <td colspan="2">
        <strong>
            <!-- TODO: this is not very consistent with other button styling -->
            <button type="button"
                    class="accordion-toggle mdi mdi-chevron-down"
                    name="grouping.{{ grouping }}"
                    data-toggle="collapse"
                    data-target=".collapseme-{{ body_id }}-{{ counter }}">
                {{ grouping }}
            </button>
        </strong>
    </td>
</tr>
