preload.html

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.lazyloadxt/1.1.0/jquery.lazyloadxt.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery.lazyloadxt/1.1.0/jquery.lazyloadxt.spinner.min.css"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery.lazyloadxt/1.1.0/jquery.lazyloadxt.jquerymobile.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery.lazyloadxt/1.1.0/jquery.lazyloadxt.bootstrap.min.js"></script>


 <script>
        $.lazyLoadXT.onload = function() {
            var $el = $(this);
            $el
                .removeClass('lazy-hidden')
                .addClass('animated ' + $el.attr('data-effect'));
        };
    </script>

<style type="text/css">
  .lazy-hidden{background:url(images/load.gif) no-repeat center center;
    background-size: 20px;}

  .animated {
  -webkit-animation-duration: 1s;
  animation-duration: 1s;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
}

.animated.hinge {
  -webkit-animation-duration: 2s;
  animation-duration: 2s;
}

@-webkit-keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    -webkit-transform: translateY(0);
    transform: translateY(0);
  }

  40% {
    -webkit-transform: translateY(-30px);
    transform: translateY(-30px);
  }

  60% {
    -webkit-transform: translateY(-15px);
    transform: translateY(-15px);
  }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    -webkit-transform: translateY(0);
    -ms-transform: translateY(0);
    transform: translateY(0);
  }

  40% {
    -webkit-transform: translateY(-30px);
    -ms-transform: translateY(-30px);
    transform: translateY(-30px);
  }

  60% {
    -webkit-transform: translateY(-15px);
    -ms-transform: translateY(-15px);
    transform: translateY(-15px);
  }
}

.bounce {
  -webkit-animation-name: bounce;
  animation-name: bounce;
}

@-webkit-keyframes pulse {
  0% {
    -webkit-transform: scale(1);
    transform: scale(1);
  }

  50% {
    -webkit-transform: scale(1.1);
    transform: scale(1.1);
  }

  100% {
    -webkit-transform: scale(1);
    transform: scale(1);
  }
}

@keyframes pulse {
  0% {
    -webkit-transform: scale(1);
    -ms-transform: scale(1);
    transform: scale(1);
  }

  50% {
    -webkit-transform: scale(1.1);
    -ms-transform: scale(1.1);
    transform: scale(1.1);
  }

  100% {
    -webkit-transform: scale(1);
    -ms-transform: scale(1);
    transform: scale(1);
  }
}

.pulse {
  -webkit-animation-name: pulse;
  animation-name: pulse;
}


</style>