docs: def create_html(self):
          """Create HTML report."""
  
          html_table = ""
          columns = [panel.get_html_column() for panel in self.panels]
          trs = len(columns[0])
          html_table += os.linesep.join(
              [
                  "<tr>{}</tr>".format("".join(["<td>{}</td>".format(columns[col][row]) for col in range(len(columns))]))
                  for row in range(trs)
              ]
          )
  
          with open(self._html_fn, "w+") as f:
              css_src = textwrap.dedent(
                  """\
  					.main_table                       {border-collapse:collapse;margin-top:15px;}
  					td                                {border: solid #aaaaff 1px;padding:4px;vertical-alignment:top;}
  					colgroup, thead                   {border: solid black 2px;padding 2px;}
  					.configuration                    {font-size:85%;}
  					.configuration, .configuration *  {margin:0;padding:0;}
  					.formats                          {text-align:center;margin:20px 0px;}
  					img                               {min-width:640px}
  			"""
              )
  
              html_src = """<!DOCTYPE html>
  			<html>
  			<head>
  				<meta charset="UTF-8" />
  				<title>{title}</title>
  				<style type="text/css">
  				{css}
  				</style>
  			</head>
  			<body>
  				<h1>{title}</h1>
  				<strong>{description}</strong>
  
  				<table class="main_table">
  				{html_table}
  				</table>
  
  			</body>
  			""".format(
                  html_table=html_table,
                  css=css_src,
                  title=self.title,
                  description=self.description,
              )
  
              tidy_html_src = bs4.BeautifulSoup(html_src).prettify()
              f.write(tidy_html_src)