'This method is called with the source of each downloaded :term:`HTML` file, after
it is parsed for links and images.
It can be used to do arbitrarily powerful post-processing on the :term:`HTML`.
It should return `soup` after processing it.
:param soup: A `BeautifulSoup <https://www.crummy.com/software/BeautifulSoup/bs3/documentation.html>`_  instance containing the downloaded :term:`HTML`.
:param first_fetch: True if this is the first page of an article.'

def postprocess_html(self, soup, first_fetch):

    return soup
