        <td>how to position the tooltip - top | bottom | left | right</td>
      </tr>
      <tr>
         <td>selector</td>
         <td>string</td>
         <td>false</td>
         <td>If a selector is provided, tooltip objects will be delegated to the specified targets.</td>
      </tr>
      <tr>
         <td>title</td>
         <td>string | function</td>
         <td>''</td>
         <td>default title value if `title` tag isn't present</td>
      </tr>
      <tr>
         <td>trigger</td>
         <td>