chromium/content/test/data/interest_group/page-with-fledge-permissions-policy-disabled-in-iframe.html

<!DOCTYPE html>
<meta charset="utf-8">
<title></title>

<body>
  <p>This page has the join-ad-interest-group and run-ad-auction Permissions Policy features disabled (via its mock headers).</p>
  <p>It also has an iframe! Yay for iframes.</p>

  <iframe src="title1.html" allow="join-ad-interest-group 'none';run-ad-auction 'none'" id="test_iframe"></iframe>
</body>