new_contents: from .. import react
  from . import Widget
  
   
  class IFrame(Widget):
      """ An iframe element, i.e. a container to show web-content. Note
      that some websites do not allow themselves to be rendered in a
      cross-source iframe.
      """
      
      CSS = '.flx-iframe {border: none;}'
      
      @react.input
      def url(v=''):
          """ The url to show. 'http://' is automatically prepended if the url
          does not have '://' in it.
          """
          v = str(v)
          if v and not '://' in v:
              v = 'http://' + v
          return v
      
      class JS:
          
          def _create_node(self):
              self.node = document.createElement('iframe')
          
          @react.connect('url')
          def _update_url(self, url):
              print('set', url)
              self.node.src = url
  
subject: add forgotten new module