example.html

<!DOCTYPE html>
<html>
<head>
  <title>Inputarea</title>
  <style type="text/css">
    * {
      -webkit-box-sizing: border-box;      
    }

    body {
      padding: 80px;
    }

    textarea {
      border: 1px solid #ddd;
      padding: 20px;
      width: 400px;
      height: 55px;
      border-radius: 2px;
      outline: none;
      -webkit-transition: height 200ms ease-out;
    }

    textarea.multiline {
      height: 100px;
    }
  </style>
</head>
<body>
  <textarea placeholder="Message"></textarea>

  <script src="build/build.js"></script>

  <script>
    var inputarea = require('inputarea');
    var el = document.querySelector('textarea');

    inputarea(el).on('input', function(str){
      console.log(str);
    });
  </script>
</body>
</html>