cookies/samesite/resources/iframe.document.html - external/github.com/web-platform-tests/wpt - Git at Google

 <!DOCTYPE html>
 <script>
   var value = "" + Math.random();
   document.cookie = `dc_samesite_strict=${value}; secure; sameSite=strict; path=/`;
   document.cookie = `dc_samesite_lax=${value}; secure; sameSite=lax; path=/`;
   document.cookie = `dc_samesite_none=${value}; secure; sameSite=none; path=/`;
   parent.postMessage({value}, "*");
 </script>
	<!DOCTYPE html>
	<script>
	var value = "" + Math.random();
	document.cookie = `dc_samesite_strict=${value}; secure; sameSite=strict; path=/`;
	document.cookie = `dc_samesite_lax=${value}; secure; sameSite=lax; path=/`;
	document.cookie = `dc_samesite_none=${value}; secure; sameSite=none; path=/`;
	parent.postMessage({value}, "*");
	</script>