Has header:
none
<br>
<button id='set-xfo-cookie'>Set XFO cookie</button><br>
<button id='set-csp-cookie'>Set CSP cookie</button><br>
<button id='delete-cookie'>Delete cookie</button><br>

<script>
document.getElementById('set-xfo-cookie').addEventListener('click', function() { document.cookie = "block-xfo"; });
document.getElementById('set-csp-cookie').addEventListener('click', function() { document.cookie = "block-csp"; });
document.getElementById('delete-cookie').addEventListener('click', function() { document.cookie = ""; });
</script>