code: def easybake(css_in, html_in=sys.stdin, html_out=sys.stdout, last_step=None,
               coverage_file=None, use_repeatable_ids=False):
      
      html_doc = etree.parse(html_in)
      oven = Oven(css_in, use_repeatable_ids)
      oven.bake(html_doc, last_step)
  
      # serialize out HTML
      print(etree.tostring(html_doc, method="xml").decode('utf-8'),
            file=html_out)
  
      # generate CSS coverage_file file
      if coverage_file:
          print('SF:{}'.format(css_in.name), file=coverage_file)
          print(oven.get_coverage_report(), file=coverage_file)
          print('end_of_record', file=coverage_file)
docs: Process the given HTML file stream with the css stream.