<div>
  <widget data-name="childWidget" data-widget="widgetWithSlots" class="parent-set-widget {{parentClass}}">
    <div data-id="header" data-slot="header" class="parent-header {{parentSlotClass}}">
      HEADER
    </div>
    <div data-id="body" data-slot="body">
      BODY
    </div>
  </widget>
</div>
