@acransac/vtk.js/Examples/Volume/VolumeContour/controller.html

Visualization Toolkit for the Web

<table>
  <tr>
    <td>Iso value</td>
    <td>
      <input class='isoValue' type="range" min="0.0" max="1.0" step="0.05" value="0.0" />
    </td>
  </tr>
</table>