    public function mergeInAttrIncludes(&$attr, $attr_includes) {
        if (!is_array($attr_includes)) {
            if (empty($attr_includes)) $attr_includes = array();
            else $attr_includes = array($attr_includes);
        }
        $attr[0] = $attr_includes;
    }
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.