test_removedWindow.html

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<!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 = () => {

    ok(false, "No messages should be received!");

  // This should silently fail.

  post.port1.postMessage(42);

  post.port2.onmessage = () => {

    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 = () => {

    ok(true, "Ready to complete the test");

    SimpleTest.finish();

</script>

</body>