If there are no use cases that need html tags in $infoArray, it is better to not allow any tags. https://github.com/franzholz/tt_products/blob/bb56f0514d1b49cc8aa09d034c9e5e8905bccdd5/view/class.tx_ttproducts_info_view.php#L109 By instance, allowing A tag, a user could send a malicious link in the note field of an order.