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<!DOCTYPE html>
<meta charset="utf-8">
<title>Making the incumbent page become non-active must not prevent message transmission</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<!-- This is the entry global -->
<iframe src="support/incumbent.html" id="incumbent"></iframe>
<iframe src="support/current.html" id="current"></iframe>
<script>
"use strict";
const incumbentIframe = document.querySelector("#incumbent");
const currentIframe = document.querySelector("#current");
window.addEventListener("load", () => {
promise_test(async () => {
// This will invoke the constructor from currentIframe, but with incumbentIframe as the incumbent.
const messageChannel = incumbentIframe.contentWindow.createMessageChannel();
await new Promise((resolve, reject) => {
incumbentIframe.onload = () => resolve();
incumbentIframe.onerror = () => reject(new Error("Could not navigate the iframe"));
incumbentIframe.src = "/common/blank.html";
});
await new Promise((resolve, reject) => {
messageChannel.port1.onmessage = () => resolve();
messageChannel.port1.onmessageerror = () => reject("messageerror event recieved");
messageChannel.port2.postMessage("boo");
});
});
});
</script>
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