html/browsers/history/the-history-interface/resources/traverse-during-beforeunload.html - external/w3c/web-platform-tests - Git at Google

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

 <script>
 "use strict";

 window.addEventListener("beforeunload", () => {
   history.back();
 });

 location.href = "message-opener.sub.html?id=destination";
 </script>
	<!DOCTYPE html>
	<meta charset="utf-8">

	<script>
	"use strict";

	window.addEventListener("beforeunload", () => {
	history.back();
	});

	location.href = "message-opener.sub.html?id=destination";
	</script>