docs: def _repr_html_(self):
          """
          Return HTML representation of VDOM object.
          HTML escaping is performed wherever necessary.
          """
          # Use StringIO to avoid a large number of memory allocations with string concat
          with io.StringIO() as out:
              out.write('<{tag}'.format(tag=escape(self.tag_name)))
              if self.style:
                  # Important values are in double quotes - cgi.escape only escapes double quotes, not single quotes!
                  out.write(' style="{css}"'.format(
                      css=escape(self._to_inline_css(self.style))))
  
              for k, v in self.attributes.items():
                  k2 = k
                  if k2 == 'class_':
                      k2 = 'class'
                  # Important values are in double quotes - cgi.escape only escapes double quotes, not single quotes!
                  if isinstance(v, string_types):
                      out.write(' {key}="{value}"'.format(
                          key=escape(k2), value=escape(v)))
                  if isinstance(v, bool) and v:
                      out.write(' {key}'.format(key=escape(k2)))
              out.write('>')
  
              for c in self.children:
                  if isinstance(c, string_types):
                      out.write(escape(safe_unicode(c)))
                  else:
                      out.write(c._repr_html_())
  
              out.write('</{tag}>'.format(tag=escape(self.tag_name)))
  
              return out.getvalue()