<!DOCTYPE html>
<html>

<head>
  <meta charset=utf-8>
</head>

<body>
  <input id="input" type="text" />
  <span id="span"></span>

  <script type="text/javascript">
    input.onchange = function (event) {
      span.innerHTML = this.value
    }
  </script>
</body>

</html>