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chromium/third_party/blink/web_tests/external/wpt/shared-storage/resources/sender0.html 

<!DOCTYPE html>
<html>
<script src="/fenced-frame/resources/utils.js"></script>
<body>
<script>
async function init() {
    const [ancestor_key] = parseKeylist();

    window.fence.reportEvent({
        eventType: 'click',
        eventData: "user clicked",
        destination: ['shared-storage-select-url']
    });

    writeValueToServer(ancestor_key, "sender0_reported");
}

init();
</script>
</body>
</html>