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chromium/third_party/blink/web_tests/external/wpt/resource-timing/resources/embed-navigate-back.html 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Resource Timing embed navigate - back button navigation</title>
</head>
<body onunload="/*disable bfcache*/">
<script src="/common/get-host-info.sub.js"></script>
<script src="nested-contexts.js"></script>
<script>
  setup_back_navigation("embed-navigate-back.html");
</script>
<embed id="target" type="text/html">
<script>
  target.src = pre_navigate_url;
</script>
</body>
</html>