С помощью чего реализована анимация?

<script type="text/javascript">
animations: function() {
        $(".counters [data-to]").each(function() {
                var $this = $(this);
                $this.appear(function() {
                        $this.countTo({
                                onComplete: function() {
                                        if ($this.data("append")) {
                                                $this.html($this.html() + $this.data("append"));
                                        }
                                }
                        });
                }, {
                        accX: 0,
                        accY: -50
                });
        });
}
</script>
<div class="row center">
        <div class="col-md-12">
        <h4 class="lead tall">Результатом нашей работы стали:</h4>
        </div>
    </div>
</div>


<section class="featured highlight footer">
    <div class="container">
        <div class="row center counters">
            <div class="col-md-3">
                <strong data-to="1555555" data-append="+">0</strong>
                <label>Довольных клиентов</label>
            </div>
            <div class="col-md-3">
                <strong data-to="0" data-append="+">0</strong>
                <label>Не довольных клиентов</label>
            </div>
            <div class="col-md-3">
                <strong data-to="1" data-append="+">0</strong>
                <label>Сеансов проведено</label>
            </div>
        </div>
    </div>