<html>
  <head>
    <script>
    var b = new BroadcastChannel("windowclose");

    function isInitialLoad() {
      return location.search.substr(1) != "withhistory" || history.length == 1;
    }

    function run() {
      if (location.search.substr(1) == "withhistory") {
        // An entry for the initial load, pushState, iframe and the next page.
        if (history.length == 4) {
          // We're coming back from history.
          function listener(m) {
            if (m.message.includes("Scripts may not close windows that were not opened by script.")) {
              SpecialPowers.postConsoleSentinel();
              SpecialPowers.pushPrefEnv({ set: [["dom.allow_scripts_to_close_windows", true]]}).then(
                function() {
                  window.onunload = function() {
                    b.postMessage('blocked');
                    b.close();
                  };
                  window.close();
                });
            }
          }
          SpecialPowers.registerConsoleListener(listener);
          window.onunload = function() {
            SpecialPowers.postConsoleSentinel();
            b.postMessage('closed');
            b.close();
          };
          window.close();
        } else {
          // Load a page which will call history.back()
          location.href = "file_window_close_2.html";
        }
      } else {
        onunload = function() {
          b.postMessage('closed');
          b.close();
        };
        window.close();
      }
    }

    function init() {
      if (isInitialLoad()) {
        // Add some data to the session history.
        history.pushState("foo", "foo");
        var ifr = document.getElementsByTagName("iframe")[0];
        ifr.onload = run;
        ifr.src = "data:text/html,random data";
      } else {
        run();
      }
    }
    window.onpageshow = () => {
      setTimeout(init);
    }

    </script>
  </head>
  <body>
    <iframe></iframe>
  </body>
</html>
