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chromium/third_party/blink/web_tests/external/wpt/speculation-rules/prerender/resources/prerender-response-code.html 

<head>
<script src="/common/utils.js"></script>
<script src="./utils.js"></script>
<script>
    const search = new URLSearchParams(location.search);
    const uid = search.get('uid');
    const uid1 = token();
    const uid2 = token();
    const bc = new BroadcastChannel(uid);

    window.onload = async () => {
        bc.addEventListener('message', ({data}) => {
            if (data === 'close')
                window.close();
            else if (data === 'activate')
                location.href = url;
        })

        startPrerendering(`/speculation-rules/prerender/resources/dual-exec.html?uid1=${uid1}&uid2=${uid2}`);
    };
</script>
</head>