studio_render_children_view.html

% if can_reorder:
    <ol class="reorderable-container">
% endif
    % for item in items:
    ${item['content']}
    % endfor
% if can_reorder:
    </ol>
% endif
% if can_add:
<div class="add-xblock-component new-component-item adding"></div>
% endif