    <button id="btn">Hover me</button>
  </p>

  <script>
    var tooltip = new goog.ui.AdvancedTooltip('btn');
    tooltip.className = 'tooltip';
    tooltip.setSafeHtml(goog.html.testing.newSafeHtmlForTest(
      "<h2>AdvancedTooltip</h2>" +
      "<ul><li>Move cursor towards the tooltip (<em>that's me!</em>) " +
      "and see that it remains open.</li>" +
      "<li>Before reaching it start moving the cursor in another " +
      "direction...</li>" +
      "<li>Once the cursor reaches the tooltip the cu