broadcastchannel-current.sub.html

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This WPT test may be referenced by the following Test IDs:
- /webmessaging/multi-globals/broadcastchannel-current.sub.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>The current page being cross-origin must prevent the BroadcastChannel message from being seen</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<!-- This is the entry global -->

<iframe src="support/incumbent-document-domain.sub.html" id="incumbent"></iframe>

<iframe src="http://{{hosts[][www]}}:{{ports[http][0]}}/webmessaging/multi-globals/support/current-document-domain.sub.html" id="current"></iframe>

<script>

"use strict";

document.domain = "{{hosts[][]}}";

setup({ explicit_done: true });

const incumbentIframe = document.querySelector("#incumbent");

const currentIframe = document.querySelector("#current");

window.onload = () => {

  promise_test(async t => {

    const createdCrossOrigin = frames[0].createBroadcastChannel("current");

    const createdSameOrigin = new BroadcastChannel("current");

    createdSameOrigin.onmessage = t.unreached_func("message event fired");

    createdSameOrigin.onmessageerror = t.unreached_func("messageerror event fired");

    createdCrossOrigin.postMessage("the message");

    // BroadcastChannel messages are guaranteed to be ordered within an event loop, as they all use

    // the DOM manipulation task source. So, any messages from the "current" channel, if they are

    // going to be erroneously delivered, would have to be delivered before those from this

    // channel. I.e., if we recieve a message from this channel without first recieving one from

    // the "current" channel, then the test passes.

    const testEnder = new BroadcastChannel("current / test-ender");

    const testEnder2 = new BroadcastChannel("current / test-ender");

    testEnder.postMessage("end test");

    await new Promise(resolve => testEnder2.onmessage = resolve);

});

  done();

};

</script>