title: Prevent web browser to try to navigate to unknown URL scheme
body: <p>When I use a service used for online authentication, I get an url to navigate to that will automatically open an app that is used for the passcode input.</p>
  
  <p>The url is in this format:</p>
  
  <pre><code>bankid:///?autostarttoken=2a1b5e2c-c9fb-4402-1239-2a1619d655e9&amp;redirect=null
  </code></pre>
  
  <p>The navigation to this kind of urls do only make sense on a mobile unit where a certain app is installed.</p>
  
  <p>Nevertheless, desktop browsers (not everyone) also try to navigate to such an url, like it would ever be possible. That of course results in an error page.</p>
  
  <p>Why do they do that?</p>
  
  <p>Do I need to use a hidden form?</p>
  
  <p>Will every mobile unit honor that?</p>