code: def as_iframe(self, html_data):
          
  
          srcdoc = html_data.replace('"', "'")
          return ('<iframe id="{div_id}", srcdoc="{srcdoc}" style="width: {width}; '
                  'height: {height};"></iframe>'.format(
                      div_id=self.div_id,
                      srcdoc=srcdoc,
                      width=self.width,
                      height=self.height))
docs: Build the HTML representation for the mapviz.