<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf8" />
    <title>Graphein Test Page</title>
  </head>
  <body>
    <script src="../dist/graphein.js"></script>
    <script src="./index.js"></script>
  </body>
</html>

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf8" />
    <title>Graphein Test Page</title>
  </head>
  <body>
    <script>
if (!'customElements' in window) {
document.write('<script src="https://cdnjs.cloudflare.com/ajax/libs/webcomponentsjs/1.0.17/custom-elements-es5-adapter.js"><' + '/script>')
}
    </script>
    <script src="../dist/graphein.js"></script>
    <script src="./index.js"></script>
  </body>
</html>

Add webcomponents.js if customElements not defined
Add webcomponents.js if customElements not defined
