<div id="app">
  <twenty-twenty before="https://www.cnet.com/a/img/zKiT35AfPlfRJvlHty6p4zmpCrw=/940x0/2020/05/01/7f0a951f-d9a2-4847-b962-b254b63842a2/img-4960.jpg" after="http://images5.fanpop.com/image/photos/25600000/DOG-ssssss-dogs-25606625-1024-768.jpg" />
</div>
<script src="https://unpkg.com/vue@2/dist/vue.js"></script>
<script src="https://unpkg.com/vue-twentytwenty/dist/vue-twentytwenty.umd.min.js"></script>
<script>
  new Vue({
    el: '#app'
  })
</script>

External CSS

  1. https://unpkg.com/vue-twentytwenty/dist/vue-twentytwenty.css

External JavaScript

This Pen doesn't use any external JavaScript resources.