public function addNavigation(array $navigation) : Bootstrap4NavbarLite
    {
        $html = '<ul class="navbar-nav mr-auto">';

        foreach ($navigation as $nav) {
            if (array_key_exists('uri', $nav) === true &&
                array_key_exists('active', $nav) === true &&
                array_key_exists('label', $nav) === true) {

                $html .= '<li class="nav-item' . (($nav['active'] === true) ? ' active' : null) . '"><a class="nav-link" href="' .
                    $nav['uri'] . '">' . $nav['label'] . '</a></li>';
            } else {
                $html .= '<!-- Failed to add navigation item, index(es) missing -->';
            }
        }

        $html .= '</ul>';

        $this->content[] = $html;

        return $this;
    }