title: Why might navigator.bluetooth be undefined?
body: <p>Tablet: Lenovo tab4 8</p>
  
  <p>Android version: <code>8.1</code></p>
  
  <p>Android Chrome version: <code>76.0.3809.111</code></p>
  
  <p>Bluetooth 'switch' in Settings is turned on.</p>
  
  <p>Site is being served over <code>https://</code></p>
  
  <p>And yet: <code>navigator.bluetooth</code> is <code>undefined</code></p>
  
  <ul>
  <li>This means that this page, which does useful bluetooth things, does not work on this tablet.</li>
  </ul>
  
  <hr>
  
  <p>Is there any other setting or something that I may be missing?</p>
  
  <p>Thanks in advance for your time and consideration.</p>