    public function __construct() {
        $this->uri = new HTMLPurifier_AttrDef_URI(true); // embedded
        $this->wmode = new HTMLPurifier_AttrDef_Enum(array('window', 'opaque', 'transparent'));
    }
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.