such-java-much-script/events.html at master · seutje/such-java-much-script · GitHub

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<!doctype html>
<html lang="en">

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

    <title>Events</title>
    <style>
      body { border: 2px solid red; padding: 20px;}
      form { border: 2px solid green;}
      button { border: 2px solid blue;}
    </style>
  </head>
  <body>

    <form>
      <input type="button" value="click me!" />
    </form>
    <script>
    (function(window) {
      var handler = function(event) { console.log(this, event.target) },
          body = window.document.body,
          form = body.querySelector('form'),
          button = form.querySelector('input[type="button"]');
      body.addEventListener('click', handler);
      form.addEventListener('click', handler);
      button.addEventListener('click', handler);
    })(this);
    </script>
  </body>
</html>