code: def author_preview_view(self, context):
          
          children_contents = []
  
          fragment = Fragment()
          for child_id in self.children:
              child = self.runtime.get_block(child_id)
              child_fragment = self._render_child_fragment(child, context, 'preview_view')
              fragment.add_frag_resources(child_fragment)
              children_contents.append(child_fragment.content)
  
          render_context = {
              'block': self,
              'children_contents': children_contents
          }
          render_context.update(context)
          fragment.add_content(self.loader.render_template(self.CHILD_PREVIEW_TEMPLATE, render_context))
          return fragment
docs: View for previewing contents in studio.