title: Save content of textarea as plain txt with .csv extension
body: <p>Is there a way to save content as a <code>txt</code> file with a <code>csv file extension</code> using <strong>HTML5</strong> ?<br>
  It shouldn't be a real csv.</p>
  
  <p>Something like <code>{type:'text/csv'};</code> wont work where <code>{type:'text/plain'};</code> does.</p>