chromium/chrome/test/data/cookie2.html

<html>
<head>
<script>
function setCookie() {
  document.cookie = 'foo=baz';

  // If there is a cookie prompt showing, then reading from document.cookie
  // should block until the dialog is closed.
  if (document.cookie.indexOf('foo') == -1) {
    document.title = 'cookie blocked';
  } else {
    document.title = 'cookie allowed';
  }
}
</script>
</head>
<body onload="setCookie();">
</body>
</html>