child_ip_address.html

Enable keyboard shortcuts

<!DOCTYPE html>

<html>

<head>

  <title>Child window at 127.0.0.1</title>

  <script type="application/javascript">

function run()

  var target = document.getElementById("location");

  target.textContent = location.hostname + ":" + (location.port || 80);

  var message = "child-response";

  var domain = document.domain;

  if (domain !== "127.0.0.1")

    message += " wrong-initial-domain(" + domain + ")";

try

    document.domain = "0.0.1";

    domain = document.domain;

    message += " ip-address-shortened-to(" + domain + ")";

  catch (e)

    domain = document.domain;

    if (domain !== "127.0.0.1")

      message += " ip-address-mutated-on-throw(" + domain + ")";

  window.parent.postMessage(message, "http://mochi.test:8888");

window.addEventListener("load", run);

  </script>

</head>

<body>

<h1 id="location">Somewhere!</h1>

</body>

</html>