rsor tracking is turned " +
      "off and  a 10px 'padding' around it gets added. As long as the cursor " +
      "stays inside the box formed by the tooltip and the padding it remains " +
      "open.</li></ul><hr/><div style=\"text-align: center;\">" +
      "<button id=\"btn-nest\">Hover me</button>&nbsp;" +
      "<button id=\"btn-close\">Close</button></div>"));
    tooltip.setHotSpotPadding(new goog.math.Box(5, 5, 5, 5));
    tooltip.setCursorTracking(true);
    tooltip.setMargin(new goog.math.Box(10