public function setAttr($attribute, $value = null)
    {
        if (is_array($attribute) && is_null($value)) {
            foreach ($attribute as $k => $v) {
                $this->setAttr($k, $v);
            }

            return $this;
        }
        $this->template->appendHTML('attributes', ' '.$attribute.'="'.$value.'"');

        return $this;
    }