index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Playground</title>
  <style>
    * {
      box-sizing: border-box;
    }

    body, html {
      margin: 0;
    }
  </style>
</head>
<body>
<div>
  <div id="root">Playground</div>
</div>

<script type="module" async>
  import { domToImage } from './src'

  document.body.appendChild(
    await domToImage(
      document.querySelector('#root'),
      { debug: true, scale: 2 },
    ),
  )
</script>
</body>
</html>