protected function tidy($html)
{
// Make XHTML 1.1 strict using htmlLawed
$config = array('valid_xhtml' => 1, 'no_deprecated_attr' => 2, 'unique_ids' => 'fixme-', 'hook' => '\\Pressbooks\\Sanitize\\html5_to_xhtml11', 'tidy' => -1);
return htmLawed($html, $config);
}