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chromium/third_party/blink/web_tests/external/wpt/fenced-frame/resources/default-enabled-features-subframe-fencedframe.https.html 

<!DOCTYPE html>
<script src="utils.js"></script>
<script src="/common/get-host-info.sub.js"></script>

<body>
<script>
// This page is loaded into a fenced frame. The document policies for this page
// disable shared storage. This then creates a child iframe to determine if
// document deliviered policies are reflected in the child frame.
const [key, should_restrict_select_url] = parseKeylist();

const iframe_url = generateURL(
    'default-enabled-features-subframe-iframe.https.html', [key]);
const iframe = document.createElement("iframe");
iframe.src = iframe_url;
if (should_restrict_select_url == "true") {
  iframe.allow = "shared-storage-select-url 'none';"
}
document.body.appendChild(iframe);
</script>
</body>