Untrusted HTML XSS/CSS challenge

#!/usr/bin/env python
# Created By Abraham Aranguren <name.surname@gmail.com> Twitter: @7a_ http://7-a.org
# Reference: http://lxml.de/lxmlhtml.html#cleaning-up-html
# Requires lxml, installation instructions here: http://lxml.de/installation.html
# Installation in Backtrack 5: /usr/bin/easy_install --allow-hosts=lxml.de,*.python.org lxml
# Tip for Ubuntu courtesy of Mario Heiderich: Python2.7-dev is needed to compile this lib properly
from lxml.html.clean import clean_html
#ALLOWED_TAGS = ( 'div', 'table', 'tr', 'td', 'b', 'i', 'a', 'p' ) # Phase 2? :)
class HTMLSanitiser:
        def __init__(self):
                pass

        def CleanThirdPartyHTML(self, HTML):
                return clean_html(HTML)

# For testing as a standalone script:
Sanitiser = HTMLSanitiser()
with open('input.txt') as file:
        print Sanitiser.CleanThirdPartyHTML(file.read())