chromium/chrome/test/data/session_restore/session_cookies.html

<!DOCTYPE html>
<html>
<head>
<script src="common.js"></script>
<script>
function readData() {
  return document.cookie;
}
function writeData() {
  document.cookie = 'key=foo';
  return true;
}
</script>
</head>
<body onload="setTimeout(onLoad, 0);">
</body>
</html>