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chromium/third_party/blink/web_tests/external/wpt/measure-memory/resources/iframe.secret.sub.html 

<!doctype html>
<meta charset="utf-8">
<html>
<script src="/common/get-host-info.sub.js"></script>
<script src="./common.js"></script>
<script>
window.onload = function () {
  setTimeout(setupChild, 0);
}
</script>
<body>
  Hello from the secrect iframe: <span id="title"></span>
</body>
</html>