File: navigation-start-post-before-unload.html

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<!doctype html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
    function busyWait(millis) {
        const start = performance.now();
        while (performance.now() < start + millis) {}
    }
    promise_test(async t => {
        const delay = 3000;
        const iframe = document.createElement('iframe');
        iframe.src = './resources/now_frame.html';
        document.body.appendChild(iframe);
        await new Promise(resolve => iframe.addEventListener('load', resolve));
        iframe.contentWindow.addEventListener('beforeunload', () => {
            busyWait(delay);
        });
        iframe.src = './resources/post.html';
        await new Promise(resolve => this.addEventListener('message', ({data}) => {
            if (data === 'done')
                resolve();
        }));

        const entry = iframe.contentWindow.performance.getEntriesByType('navigation')[0];
        assert_less_than(entry.fetchStart, delay);
    }, 'timeOrigin should be set after beforeunload');
</script>
</body>
</html>