As I wrote here:www.drupal.org/…omment-9134347
Webform descriptions can be made to take any tags using:
php -r "print json_encode(array('a', 'em', 'strong', 'code', 'img', 'ul', 'ol', 'li'));" | drush vset --format=json webform_allowed_tags -
["a","em","strong","code","img","ul","ol","li"]
drush vset --format=json webform_allowed_tags '["a","em","strong","code","img","ul","ol","li"]' drush vget webform_allowed_tags # check value is set