example/index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>koalazily - example</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
      .container {
        display: flex;
        flex-direction: column;
        align-items: center;
      }
      img {
        margin-bottom: 5rem;
      }
    </style>
  </head>
  <body>
    <div class="container">
      <img data-koalazily="https://source.unsplash.com/300x200/?house/1" width="300" height="200" alt="" />
      <img data-koalazily="https://source.unsplash.com/300x200/?house/2" width="300" height="200" alt="" />
      <img data-koalazily="https://source.unsplash.com/300x200/?house/3" width="300" height="200" alt="" />
      <img data-koalazily="https://source.unsplash.com/300x200/?house/4" width="300" height="200" alt="" />
      <img data-koalazily="https://source.unsplash.com/300x200/?house/5" width="300" height="200" alt="" />
    </div>
    <script src="../dist/koalazily.umd.js"></script> 
    <script>
      koalazily({
        offset: 200,
        onLoad: function(image) {
          console.log(image.src + ' loaded.');
        },
        useLoader: true,
      });
    </script>
  </body>
</html>