title: In the HTML code to embed a YouTube video, what does accelerometer, gyroscope, and picture-in-picture do?
body: <p>Once you finish uploading a video on Youtube, there is suggested embedding HTML code:</p>
  
  <pre><code>&lt;iframe width="560" height="315" src="https://www.youtube.com/embed/UF8uR6Z6KLc" frameborder="0" 
   allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>What exactly does the <code>accelerometer</code>, <code>gyroscope</code>, and <code>picture-in-picture</code> do?</p>