ignore-child-fenced-frame-onload-event.https.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /fenced-frame/ignore-child-fenced-frame-onload-event.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Ignore child fenced frame onload event</title>

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

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

<script src="/common/utils.js"></script>

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

<body>

</body>

<script>

  promise_test(async () => {

    const toplevel_loaded_key = token();

    const result_key = token();

    // Appends a fencedframe to the top-level doc.

    attachFencedFrame(generateURL("resources/ignore-child-fenced-frame-onload" +

      "-event-inner.html", ["fencedframe", toplevel_loaded_key, result_key]));

    // Relays the messsage to the fenced frame when the onload event is fired.

    window.onload = function () {

      writeValueToServer(toplevel_loaded_key, "yes");

    assert_equals(await nextValueFromServer(result_key), "passed",

      "The parent frame onload event should not be blocked by any onload " +

      "event from subframes belonging to fenced tree, but should be blocked " +

      "by that of any non fenced subframe");

  }, "ignore child fenced frame onload event test.");

</script>

</html>