--- a/dom/animation/test/css-animations/test_animation-id.html
+++ b/dom/animation/test/css-animations/test_animation-id.html
@@ -12,16 +12,16 @@
 <script>
 'use strict';
 
 test(t => {
   const div = addDiv(t);
   div.style.animation = 'abc 100s';
   const animation = div.getAnimations()[0];
   assert_equals(animation.id, '', 'id for CSS Animation is initially empty');
+
   animation.id = 'anim'
-
   assert_equals(animation.id, 'anim', 'animation.id reflects the value set');
 }, 'Animation.id for CSS Animations');
 
 </script>
 </body>
 </html>