ach('txt3');

    var tooltip6 = new goog.ui.Tooltip('txt2', 'outer tooltip');

    var tooltip7 = new goog.ui.Tooltip('btn-nest');
    tooltip7.setSafeHtml(goog.html.testing.newSafeHtmlForTest(
      "Even nested<br>tooltips!"));
  </script>
</body>
</html>
