link-header-referrer-policy.html

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<!DOCTYPE html>

<meta charset=utf-8>

<body>

<script>

window.referrers = {};

const params = new URLSearchParams(location.search);

const href = new URL(params.get('href'), location.href).toString();

new PerformanceObserver(async list => {

    let entries = list.getEntriesByName(href).length;

    if (!entries)

        return;

    const script = document.createElement('script');

    script.src = href;

    script.referrerPolicy = params.get('resource-policy');

    const loaded = new Promise(resolve => script.addEventListener('load', resolve));

    document.body.appendChild(script);

    await loaded;

    entries = performance.getEntriesByName(href).length;

    window.parent.postMessage({

        referrers: window.referrers,

        entries

    }, '*');

}).observe({type: 'resource', buffered: true})

</script>

</body>