Find number in normalized text of node which
            matches the given css path.

def css_number(self, path, default=NULL, ignore_spaces=False, smart=False,
                   make_int=True):
        """
        Find number in normalized text of node which
            matches the given css path.
        """

        try:
            text = self.css_text(path, smart=smart)
            return find_number(text, ignore_spaces=ignore_spaces,
                               make_int=make_int)
        except IndexError:
            if default is NULL:
                raise
            else:
                return default