modulepreload-iframe.html | Explore in Territory

<!DOCTYPE html>
<body>
    <script>
        const m = new URL('module1.js', location.href).toString();
        const observer = new PerformanceObserver(l => {
            const entries = l.getEntriesByName(m);
            if (entries.length === 1) {
                import(m).then(() => {
                    observer.disconnect();
                    const all = performance.getEntriesByName(m);
                    window.parent.postMessage(all.length, '*');
                });
            }
        });

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


    </script>
</body>

chromium/third_party/blink/web_tests/external/wpt/preload/resources/modulepreload-iframe.html