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Test Info: Warnings

<!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>
"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);