pdfjs-dist/examples/helloworld/index.html

<!doctype html>
<html>

<head>
  <script src="../../node_modules/systemjs/dist/system.js"></script>
  <script src="../../systemjs.config.js"></script>
  <script src="hello.js"></script>
</head>

<body>
  <canvas id="the-canvas" style="border:1px solid black;"/>
</body>

</html>