The default list of HTML tags allowed by filter().
Type: array
\Drupal\Component\Utility\Xss::filter()
protected static $htmlTags = array('a', 'em', 'strong', 'cite', 'blockquote', 'code', 'ul', 'ol', 'li', 'dl', 'dt', 'dd');
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https://api.drupal.org/api/drupal/core!lib!Drupal!Component!Utility!Xss.php/property/Xss::htmlTags/8.1.x