beforeunload-on-history-back.html

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This WPT test may be referenced by the following Test IDs:
- /html/browsers/browsing-the-web/unloading-documents/beforeunload-on-history-back.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>beforeunload event fires on history navigation back</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id="log"></div>

<script>

beforeunload_fired = false;

var t = async_test();

var base_count = 0;

onload = function() {setTimeout(t.step_func(function() {

  var iframe = document.getElementsByTagName("iframe")[0]

  iframe.onload = t.step_func(function() {

    iframe.onload = null;

    history.go(-1);

});

  iframe.src = "beforeunload-on-history-back-1.html";

}), 100)};

base_show = t.step_func(function() {

  base_count++;

  if (base_count > 1) {

    assert_true(beforeunload_fired);

    t.done();

});

</script>

<iframe src="base.html"></iframe>