title: Encountered "Unknown Protocol " message while trying to share a text using WhatsApp in a website
body: <p>I am using the following code :
  <div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  
  &lt;head&gt;
  &lt;/head&gt;
  
  &lt;body&gt;
    &lt;a href="https://api.whatsapp.com/send?text=Hello%20World!"&gt;Send&lt;/a&gt;
  &lt;/body&gt;
  
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  
  Please use Opera browser, right click on <em>Send</em> and click on <em>Open Link In New Tab</em><br>
  Opera then shows an alert msg:<br>
  <em>Unknown Protocol:</em><br>
  Opera was unable to open the link since no application associated with "whatsapp:" protocol was found on your system.<br>
  How come I am seeing the above msg.<br>
  And please give a solution.<br>
  <em>NB:</em> I didnt use to see the msg before. It appeared only now.</p>