the marker cluster layer</p></td>
    </tr>
    <tr>
      <th>labelProperty</th>
      <td><p>The property to use for the label.
You can also pass in a JS function that takes in a feature and returns a text/HTML content.</p></td>
    </tr>
    <tr>
      <th>labelOptions</th>
      <td><p>A Vector of <code>labelOptions</code> to provide label
options for each label. Default <code>NULL</code></p></td>
    </tr>
    <tr>
      <th>popupProperty</th>
      <td><p>The property to use for popup content
You can 