traverse-during-beforeunload.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:
- /html/browsers/history/the-history-interface/traverse-during-beforeunload.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Traversing the history during beforeunload</title>

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

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

<body>

<script>

"use strict";

async_test(t => {

  const w = window.open("resources/message-opener.sub.html?id=start");

  t.add_cleanup(() => w.close());

  const messages = [];

  window.addEventListener("message", t.step_func(({ data }) => {

    messages.push(data);

    if (messages.length === 1) {

      assert_array_equals(messages, ["start"]);

      w.location.href = "resources/traverse-during-beforeunload.html";

    } else if (messages.length === 2) {

      assert_array_equals(messages, ["start", "destination"]);

      t.done();

  }));

});

</script>