  <td>string | function</td>
               <td>''</td>
               <td>default content value if `data-content` attribute isn't present</td>
             </tr>
             <tr>
               <td>delay</td>
               <td>number | object</td>
               <td>0</td>
               <td>
                <p>delay showing and hiding the popover (ms)</p>
                <p>If a number is supplied, delay is applied to both hide/show</p>
                <p>Object structure is: <code>delay: { show: 500, h