To make a better security, before users submit or reply any tickets, the input will be filtered to prevent any bad script inside.
Green Desktiny uses
HTML Purifier as reliable 3rd party.
However, since it strips many html tags, it will a bit confusing with tinymce editor, meaning that some tags provided with tinymce is stripped too. This is for security sake.
Nonetheless, you can add allowed tag list that will pass on the filter.
In config_ext.php you will find variable $config['allowed_htmlpurifier']
You may add new good tags: e.g: strong, font, span, etc
Anti XSS attack