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chromium/third_party/blink/web_tests/external/wpt/html/browsers/history/the-history-interface/combination_history_003.html 

<!DOCTYPE HTML>
<html>
  <head>
    <title>combination_history_003(After calling of pushState and replaceState methods, check length.)</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <body>
    <div id="log"></div>
    <script>
    test(function () {
      var first;
      var second;
      var third;
      first = window.history.length;
      window.history.pushState(1, document.title, '?x=1');
      second = window.history.length;
      window.history.replaceState(2, document.title, '?x=2');
      third = window.history.length;

      assert_equals(second - first, 1, "second - first");
      assert_equals(third, second, "third");
    }, "After calling of pushState and replaceState methods, check length");
    </script>
  </body>
</html>