chapter1/hello-world-js.html

<html>
<head><title>Hello, World in JavaScript</title></head>
<body>
<p id="greeting"></p>
<script type="text/javascript">
  var isIE = document.attachEvent;
  var addListener = isIE
      ? function(e, t, fn) {e.attachEvent('on' + t, fn);}
      : function(e, t, fn) {e.addEventListener(t, fn, false);};

  addListener(window, 'load', function() {
    var greeting = document.getElementById('greeting');
    if (isIE) {
      greeting.innerText = 'Hello, World';
    } else {
      greeting.textContent = 'Hello, World';
    }
  });
</script>
</body>
</html>