title: File name extension to MIME type
body: <p>Using only JavaScript and framework like dojo/jQuery...</p>
  
  <p>Is there a way to find the Content-Type for a particular file name extension?</p>
  
  <p>Say if I type in the string "something.pdf", I want to show an alert that says "application/pdf"</p>
  
  <p>or "something.html" show "text/html"?</p>