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<!doctype html>
<meta charset=utf-8>
<title></title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<body>
  <script>
    var t = async_test("Location sets should cancel current navigation and prevent later document.open() from doing anything");

    var finishTest = t.step_func_done(function() {
        assert_equals(frames[0].document.body.textContent, "PASS",
                      "Should not have FAIL in our textContent");
    });

    t.step(function() {
        var i = document.createElement("iframe");
        i.srcdoc = `
          <script>
            var blob = new Blob(["PASS"], { type: "text/html" });
            var url = URL.createObjectURL(blob);
            location.href = url;
            frameElement.onload = parent.finishTest;
            document.open();
            document.write("FAIL");
            document.close();
          <\/script>`;
        document.body.appendChild(i);
    });

  </script>
</body>