messageport-current.html

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

<!DOCTYPE html>

<meta charset="utf-8">

<title>Making the current page become non-active must 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 t => {

    // This will invoke the constructor from currentIframe, but with incumbentIframe as the incumbent.

    const messageChannel = incumbentIframe.contentWindow.createMessageChannel();

    await new Promise((resolve, reject) => {

      currentIframe.onload = () => resolve();

      currentIframe.onerror = () => reject(new Error("Could not navigate the iframe"));

      currentIframe.src = "/common/blank.html";

});

    messageChannel.port1.onmessage = t.unreached_func("message event recieved");

    messageChannel.port1.onmessageerror = t.unreached_func("messageerror event recieved");

    messageChannel.port2.postMessage("boo");

    // We are testing that neither of the above two events fire. We assume that a 3 second timeout

    // is good enough. We can't use any other API for an end condition because each MessagePort has

    // its own independent port message queue, which has no ordering guarantees relative to other

    // APIs.

    await new Promise(resolve => t.step_timeout(resolve, 3000));

});

});

</script>