Update index.html

Author: robdodson

demo/index.html

@@ -100,7 +100,6 @@ <h2>Other</h2>
     <div>
       <input type="file" title="File">
     </div>
-    <script src="https://cdn.polyfill.io/v2/polyfill.js?features=Element.prototype.classList"></script>
     <script src="https://unpkg.com/focus-visible"></script>
   </body>
 </html>