Form prototype - rendered form

rendered form

The loop renders:
<div id="participants">
  <div id="manifest_participants_0">...</div>
  <div id="manifest_participants_1">...</div>
</div>
(without prototype)

`form_widget(form.participants)` renders to:
<div id="participants">
  <div id="manifest_participants">
    <div> ... participant1 ... </div>
    <div> ... participant2 ... </div>
  </div>
  <script> ... prototype ... </script>
</div>


For the empty collection the loop renders: 
<div>
  <label>Participants</label>
  <div id="manifest_participants"></div>
  <script> .. prototype .. </script>
</div>

`form_widget(form.participants)` renders to:
<div id="participants">
  <div id="manifest_participants"></div>
  <script> ... prototype ... </script>
</div>

Hope that helps