ta via the messaging API you
        // create. Check that source, and validate those inputs!
        if ((e.origin === "null" && e.source === sandboxedFrame.contentWindow)
            || (e.origin === (window.location.protocol + "//" + window.location.host)
                && e.source === unsandboxedFrame.contentWindow)) {
          alert('Result: ' + e.data);
        }
      });
    </script>
  </body>
</html>
