public static function carouselIndicators($target, $numSlides, $htmlOptions = array())
    {
        self::addCssClass('carousel-indicators', $htmlOptions);
        $output = self::openTag('ol', $htmlOptions);
        for ($i = 0; $i < $numSlides; $i++) {
            $itemOptions = array('data-target' => $target, 'data-slide-to' => $i);
            if ($i === 0) {
                $itemOptions['class'] = 'active';
            }
            $output .= self::tag('li', $itemOptions, '', true);
        }
        $output .= '</ol>';
        return $output;
    }