shadow-root not rendered.

Simple example to show this issue:

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>DOM to PDF Shadow Root Example</title>
</head>

<body>
  <div id="container"></div>

  <script src="https://unpkg.com/dom-to-image@2.6.0/src/dom-to-image.js"></script>
  <script>
    document.addEventListener('DOMContentLoaded', function () {
      var container = document.getElementById('container');
      var root = container.attachShadow({ mode: 'open' });
      root.textContent = 'Hello World!';

      domtoimage.toPng(container)
        .then(function (dataUrl) {
          var img = new Image();
          img.src = dataUrl;
          document.body.appendChild(img);
        })
        .catch(function (error) {
          console.error('Oops, something went wrong!', error);
        });
    });
  </script>
</body>

</html>

The issue is that dom-to-image creates a blank image instead containing the text.

tsayen / dom-to-image

shadow-root not rendered. #474