The form input is sanitized by
wp_kses_normalize_entities( string $string ), see:
You can deactivate it by using the
kses option, see:
<?php acf_form(array( 'fields' => array('res'), 'submit_value' => 'Send', 'updated_message' => __("", 'acf'), 'kses' => false, ));?>
However, it is never a good idea to not sanitize user input. If you pass up on
kses, you should sanitize it some other way that watches out for links and leaves them intact.
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