mozilla-release/testing/web-platform/tests/resource-timing/resource-reload-TAO.sub.html

<!doctype html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<iframe src="resources/iframe-reload-TAO.sub.html"></iframe>
<script>
async_test(t => {
    window.onmessage = t.step_func(e => {
        const data = e.data;
        assert_greater_than(data.domainLookupStart, 0,
            "domainLookupStart should be greater than 0.");
        assert_greater_than(data.domainLookupEnd, 0,
            "domainLookupEnd should be greater than 0.");
        assert_greater_than(data.connectStart, 0,
            "connectStart should be greater than 0.");
        assert_greater_than(data.connectEnd, 0,
            "connectEnd should be greater than 0.");
        t.done();
    });
}, "Test that TAO headers are reused on reloads.");
</script>
</body>