>
    <tr>
      <th>slides</th>
      <td><p>A path or URL for an HTML slideshow created with 
<code><a href='https://rdrr.io/pkg/rmarkdown/man/rmarkdown-package.html'>rmarkdown</a></code>, <code>xaringan</code>, or a 
similar package.</p></td>
    </tr>
    <tr>
      <th>output</th>
      <td><p>The path to the video file which will be created.</p></td>
    </tr>
    <tr>
      <th>voice</th>
      <td><p>The voice you want to use. See 
<code><a href='https://rdrr.io/pkg/text2speech/man/tts_voices.html'>