diff --git a/demo/src/js/tab-focus.js b/demo/src/js/tab-focus.js
index 935a3c42..0ef1f0d5 100644
--- a/demo/src/js/tab-focus.js
+++ b/demo/src/js/tab-focus.js
@@ -13,7 +13,7 @@ document.addEventListener('focusout', (event) => {
 
 // Add classname to tabbed elements
 document.addEventListener('keydown', (event) => {
-  if (event.keyCode !== 9) {
+  if (event.key !== 'Tab') {
     return;
   }