d> <td><a href="/docs/3.9.1/general/colors.html"><code>Color</code></a></td> <td style="text-align:center;">Yes</td> <td><code>'rgba(255, 255, 255, 0.75)'</code></td> <td>Color of label backdrops.</td></tr> <tr><td><code>backdropPadding</code></td> <td><a href="/docs/3.9.1/general/padding.html"><code>Padding</code></a></td> <td style="text-align:center;"></td> <td><code>2</code></td> <td>Padding of label backdrop.</td></tr> <tr><td><code>callback</code></td> <td><code>function</code></td> <td style="text-al