file_bug2034329.html

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<!DOCTYPE html>

<html>

  <head><meta charset="utf-8"><title>bug 2034329</title></head>

  <body>

    <div id="result">pending</div>

    <script>

      (function () {

        try {

          var len = location.ancestorOrigins.length;

          document.getElementById("result").textContent = "ok:" + len;

        } catch (e) {

          document.getElementById("result").textContent =

            "error:" + (e && e.name ? e.name : "unknown") +

            ":" + (e && e.message ? e.message : String(e));

      })();

    </script>

  </body>

</html>