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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/unloading-documents/pagehide-on-history-forward.html 

<!doctype html>
<title>pagehide event fires on history navigation forward</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
var t = async_test();

onload = function() {setTimeout(t.step_func(function() {
  var iframe = document.getElementsByTagName("iframe")[0]

  iframe.src = "pagehide-on-history-forward-1.html";
}), 100)};

base_hide = t.step_func(function() {
  t.done()
});
</script>
<iframe src="base.html"></iframe>