title: popup window notification after submit
body: <p>I have a form with several fileds to be filled and I would like to open a popup window after the user has correctly filled the form</p>
  
  <p>To start, I do not know why this simple line of code does not work</p>
  
  <pre><code>&lt;form&gt;
  
    &lt;input type="submit" value="submit" onsubmit="javascript:alert('success');" /&gt;
  
  &lt;/form&gt;
  </code></pre>
  
  <p>I have checked that the user is correctly created so it means that the submit was OK but I did not get the alert window</p>
  
  <p>Could you explain ? </p>