'Only 6 section levels are supported by HTML.'

def visit_title(self, node):

    check_id = 0
    close_tag = '</p>\n'
    if isinstance(node.parent, nodes.topic):
        self.body.append(self.starttag(node, 'p', '', CLASS='topic-title    first'))
    elif isinstance(node.parent, nodes.sidebar):
        self.body.append(self.starttag(node, 'p', '', CLASS='sidebar-title'))
    elif isinstance(node.parent, nodes.Admonition):
        self.body.append(self.starttag(node, 'p', '', CLASS='admonition-title'))
    elif isinstance(node.parent, nodes.table):
        self.body.append(self.starttag(node, 'caption', ''))
        close_tag = '</caption>\n'
    elif isinstance(node.parent, nodes.document):
        self.body.append(self.starttag(node, 'h1', '', CLASS='title'))
        close_tag = '</h1>\n'
        self.in_document_title = len(self.body)
    else:
        assert isinstance(node.parent, nodes.section)
        h_level = ((self.section_level + self.initial_header_level) - 1)
        atts = {}
        if ((len(node.parent) >= 2) and isinstance(node.parent[1], nodes.subtitle)):
            atts['CLASS'] = 'with-subtitle'
        self.body.append(self.starttag(node, ('h%s' % h_level), '', **atts))
        atts = {}
        if node.hasattr('refid'):
            atts['class'] = 'toc-backref'
            atts['href'] = ('#' + node['refid'])
        if atts:
            self.body.append(self.starttag({}, 'a', '', **atts))
            close_tag = ('</a></h%s>\n' % h_level)
        else:
            close_tag = ('</h%s>\n' % h_level)
    self.context.append(close_tag)
