public function appendStylesheet($href, $media = null, array $attributes = [], $priority = false)
    {
        static $counter = 0;
        
        $attributes['rel'] = 'stylesheet';
        $attributes['href'] = $href;
        //$attributes['type'] = 'text/css';
        $media && $attributes['media'] = $media;
        $this->links[$priority == 'high' ? $counter + 1000 : $counter] = Html::buildHtmlElement('link', $attributes);
        $counter++;
        return $this;
    }