<!DOCTYPE html>
<title>MessagePort should not work when created from a disconnected window</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

<body>
<script>
"use strict";

SimpleTest.waitForExplicitFinish();
runTest();

async function runTest() {
  let ifr = document.createElement('iframe');
  await new Promise(resolve => {
    ifr.onload = resolve;
    ifr.src = 'support/empty.html';
    document.body.appendChild(ifr);
  });

  let w = ifr.contentWindow;

  let pre = new w.MessageChannel();
  ok(!!pre, "We have a channel");

  ifr.remove();

  let post = new w.MessageChannel();
  ok(!!post, "We have a channel");

  // This should silently fail.
  pre.port1.postMessage(42);
  pre.port2.onmessage = e => {
    ok(false, "No messages should be received!");
  }

  // This should silently fail.
  post.port1.postMessage(42);
  post.port2.onmessage = e => {
    ok(false, "No messages should be received!");
  }

  // Let's use another MessagePort just to be sure no messages are received by
  // port2.

  let mc = new MessageChannel();
  mc.port1.postMessage(42);
  mc.port2.onmessage = e => {
    ok(true, "Ready to complete the test");
    SimpleTest.finish();
  }
}

</script>
</body>
