How to use the genshi.builder.tag.div function in Genshi

def delete_comment():
            for event in buffer:
                cnum, cdate = event[1][1].get('id')[12:].split('-', 1)
                return tag.form(
                    tag.div(
                        tag.input(type='hidden', name='action',
                                  value='delete-comment'),
                        tag.input(type='hidden', name='cnum', value=cnum),
                        tag.input(type='hidden', name='cdate', value=cdate),
                        tag.input(type='submit',
                                  value=captioned_button(req, u'–', # 'EN DASH'
                                                         _("Delete")),
                                  title=_('Delete comment %(num)s', num=cnum),
                                  class_="trac-delete"),
                        class_="inlinebuttons"),
                    action='#', method='get')

def delete_comment():
            for event in buffer:
                cnum, cdate = event[1][1].get('id')[12:].split('-', 1)
                return tag.form(
                    tag.div(
                        tag.input(type='hidden', name='action',
                                  value='delete-comment'),
                        tag.input(type='hidden', name='cnum', value=cnum),
                        tag.input(type='hidden', name='cdate', value=cdate),
                        tag.input(type='submit',
                                  value=captioned_button(req, u'–', # 'EN DASH'
                                                         _("Delete")),
                                  title=_('Delete comment %(num)s', num=cnum),
                                  class_="trac-delete"),
                        class_="inlinebuttons"),
                    action='#', method='get')

default = option.default
            if default is True:
                default = 'true'
            elif default is False:
                default = 'false'
            elif default == 0:
                default = '0.0' if isinstance(default, float) else '0'
            elif default:
                default = ', '.join(to_unicode(val) for val in default) \
                          if isinstance(default, (list, tuple)) \
                          else to_unicode(default)
            else:
                return tag.td(_("(no default)"), class_='nodefault')
            return tag.td(tag.code(default), class_='default')

        return tag.div(class_='tracini')(
            (tag.h3(tag.code('[%s]' % section), id='%s-section' % section),
             format_to_html(self.env, formatter.context, section_doc),
             tag.table(class_='wiki')(tag.tbody(
                 tag.tr(tag.td(tag.tt(option.name)),
                        tag.td(format_to_oneliner(
                            self.env, formatter.context, getdoc(option))),
                        default_cell(option))
                 for option in sorted(options.get(section, {}).itervalues(),
                                      key=lambda o: o.name)
                 if option.name.startswith(key_filter))))
            for section, section_doc in sorted(sections.iteritems()))

def _clone_form(self, req, ticket, data):
        fields = {}
        for f in data.get('fields', []):
            name = f['name']
            if name == 'summary':
                fields['summary'] = _("%(summary)s (cloned)",
                                      summary=ticket['summary'])
            elif name == 'description':
                fields['description'] = \
                    _("Cloned from #%(id)s:\n----\n%(description)s",
                      id=ticket.id, description=ticket['description'])
            else:
                fields[name] = ticket[name]
        return tag.form(
            tag.div(
                tag.input(type="submit", name="clone",
                          value=captioned_button(req, '+#', _("Clone")),
                          title=_("Create a copy of this ticket")),
                [tag.input(type="hidden", name='field_' + n, value=v)
                 for n, v in fields.iteritems()],
                tag.input(type="hidden", name='preview', value=''),
                class_="inlinebuttons"),
            method="post", action=req.href.newticket())

new_text += comment_text
            new_text += line + "\n"

        search = environ.search
        storage = environ.storage

        storage.reopen()
        search.update(environ)

        storage.save_text(page_name, new_text, author,
                "Comment added by %s" % author)

        search.update_page(environ.get_page(page_name), page_name,
                text=new_text)

        the_comment = tag.div(parser.generate(comment_text,
            environ=(environ, data)), class_="article")

    the_form = tag.form(
            tag.input(type="hidden", name="parent", value=page["node"]),
            tag.fieldset(
                tag.legend("Add Comment"),
                tag.p(
                    tag.textarea(
                        (not action in ("cancel", "save") and comment or ""),
                        id="comment",
                        name="comment",
                        cols=80, rows=5
                    ),
                    class_="text"
                ),
                tag.h4(tag.label("Your email or username:", for_="author")),

def visit_math_block(self, node):
        '''
        Only MathJax support
        '''
        math_code = node.astext()
        math_env = pick_math_environment(math_code)
        if 'align' in math_env:
            template = '\\begin{%s}\n%s\n\\end{%s}' % (math_env, math_code, math_env)
            elem = tag.div(template)
        else:  # equation
            template = '\(%s\)' % math_code
            elem = tag.span(template)
        elem(class_='math')
        self.context.append(elem)
        if not getattr(self, 'already_has_math_script', None):
            src = "http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"
            self.scripts.append(tag.script(src=src))
            self.already_has_math_script = True
        raise nodes.SkipNode

def _clone_form(self, req, ticket, data):
        fields = {}
        for f in data.get('fields', []):
            name = f['name']
            if name == 'summary':
                fields['summary'] = ticket['summary'] + " (cloned)"
            elif name == 'description':
                fields['description'] = "Cloned from #%s: \n----\n%s" % \
                    (ticket.id, ticket['description'])
            else:
                fields[name] = ticket[name]
        return tag.form(
            tag.div(
                tag.input(type="submit", name="clone", value="Clone",
                    title="Create a copy of this ticket"),
                [tag.input(type="hidden", name='field_'+n, value=v) for n, v in
                    fields.items()],
                tag.input(type="hidden", name='preview', value=''),
                class_="inlinebuttons"),
            method="post", action=req.href.newticket())

def _add_form_token(self, token):
        elem = tag.div(
            tag.input(type='hidden', name='__FORM_TOKEN', value=token)
        )
        def _generate(stream, ctxt=None):
            for kind, data, pos in stream:
                if kind is START and data[0].localname == 'form' \
                                 and data[1].get('method', '').lower() == 'post':
                    yield kind, data, pos
                    for event in elem.generate():
                        yield event
                else:
                    yield kind, data, pos
        return _generate