file/0_file.html

<!DOCTYPE html>

<html>
  <head>
    <meta charset="utf-8">
    <title>1_file</title>
  </head>
  <body>
    <h1>File</h1>

    <input id="fileInput" type="file" /><br/>
    <textarea id="content" rows="30" cols="50" style="width: 100%; height: 100%;"></textarea>

    <script type="application/dart" src="0_file.dart"></script>
    <script src="packages/browser/dart.js"></script>
  </body>
</html>