title: details and summary: delete or hide "arrow"
body: <p>Code:</p>
  
  <pre><code>&lt;details&gt;
          &lt;summary&gt;Що зробити:&lt;/summary&gt;
  &lt;div class="txtinsummary"&gt;
  текст text текст text текст text текст text 
  текст text текст text текст text текст text 
  &lt;/div&gt;
  &lt;/details&gt;
  </code></pre>
  
  <p>How to remove the "arrow" in googleBrowser?</p>
  
  <p>In the FFox screenshot "arrow" does not exist. </p>
  
  <p><a href="https://i.stack.imgur.com/GB0uk.png" rel="nofollow noreferrer">gesko</a></p>
  
  <p>In Google Browser is present.</p>
  
  <p><a href="https://i.stack.imgur.com/bwUI4.png" rel="nofollow noreferrer">webkit</a></p>
  
  <p>Is it possible to do so as in FFox?</p>