file_nested_frames.html

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<html>

  <head>

    <script>

      function nestedIframeLoaded() {

        var tf = document.getElementById("testframe");

        var innerf = tf.contentDocument.getElementsByTagName("iframe")[0];

        if (!innerf.contentDocument.documentURI.includes("frame0")) {

          innerf.contentWindow.location.href = "http://mochi.test:8888/tests/docshell/test/navigation/frame0.html";

          return;

        innerf.onload = null;

        innerf.src = "about:blank";

        var d = innerf.contentDocument;

        d.open();

        d.write("test");

        d.close();

        opener.is(window.history.length, 1, "Unexpected history length");

        opener.finishTest();

    </script>

  </head>

  <body>

  <iframe id="testframe" src="file_nested_frames_innerframe.html" onload="frameLoaded()"></iframe>

  <script>

  </script>

  </body>

</html>