iframe-TAO-crossorigin-port.sub.html

<!DOCTYPE html>
<html>
<body>
<script>
    const url = '{{location[scheme]}}://{{host}}:{{ports[http][1]}}/resource-timing/resources/TAOResponse.py?tao=origin_port_{{ports[http][1]}}';
    const observe = (list, observer) => {
        const entry = list.getEntries()[0];
        const sum = entry.redirectStart +
                  entry.redirectEnd +
                  entry.domainLookupStart +
                  entry.domainLookupEnd +
                  entry.connectStart +
                  entry.connectEnd +
                  entry.secureConnectionStart +
                  entry.requestStart +
                  entry.responseStart +
                  entry.transferSize +
                  entry.encodedBodySize +
                  entry.decodedBodySize;

        const result = sum == 0 ? 'PASS' : 'FAIL';
        window.top.postMessage(result, '*');
    }
    let observer = new PerformanceObserver(observe);
    observer.observe({ entryTypes: ["resource"] });
    fetch(url).then(r => r.text());
</script>
</body>
</html>

chromium/third_party/blink/web_tests/external/wpt/resource-timing/resources/iframe-TAO-crossorigin-port.sub.html