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<!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>
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