app/views/articles/form/_article_section_fields.html.erb
<div class="section-container nested-fields">
<a class="ss-icon" href="#"></a>
<label>Section title</label>
<%= f.text_field :section %>
<label>Section sequence</label>
<%= f.number_field :seq %>
<label>Submission content</label>
<%= markdown_editor do |m| %>
<%= f.text_area :description_markdown, class: "txt-med" %>
<p class='markdown-instructions'>You can use
<a href="https://kramdown.gettalong.org/">kramdown</a> in this field.
</p>
<% end %>
</div>