title: How to add a custom attribute?
body: <p>How to add a custom attribute in the field <a href="https://contactform7.com/" rel="noreferrer">Contact Form 7</a> <strong>without javascript</strong> ?</p>
  
  <p>For example, there is such a field on the page:</p>
  
  <pre><code>&lt;input type="text" name="name" class="form-control" id="name-1" data-attr="custom" data-msg="Текст 1"&gt; 
  </code></pre>
  
  <p><strong>Question:</strong> is it possible to set these custom attributes (<code>data-attr</code>, <code>data-msg</code>) of fields in the admin panel?</p>