public function setPopover(string $title, string $txt, $placement = null, $html = null, $container = null, $delay = null)
    {
        $this->popover = ['title' => $title, 'data-content' => $txt];
        $this->popoverOptions['title'] = $title;
        $placement !== null && Checkers::checkPlacement($placement);
        $placement !== null && $this->popoverOptions['data-placement'] = $placement;
        $html      !== null && $this->popoverOptions['data-html'] = (int) (bool) $html;
        $container !== null && $this->popoverOptions['data-container'] = (string) $container;
        $delay     !== null && $this->popoverOptions['data-delay'] = (int) $delay;
        return $this;
    }