/**
* Allows HTML tags in WordPress comments.
*
* This example will add the `<pre>` tag (and its `class` attribute).
*
* @see https://wpcodebook.com/allow-html-tags-wordpress-comments/
* @see https://developer.wordpress.org/reference/functions/allowed_tags/
*/
add_action( 'init', function () {
global $allowedtags;
$allowedtags['pre'] = array( 'class' => array() );
} );allowed_tags() function output before and after adding the <pre> tag:
<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>
<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong> <pre class="">