diff --git a/test/ecmascript/closest.html b/test/ecmascript/closest.html
index 7ded8722..c7a51d8e 100644
--- a/test/ecmascript/closest.html
+++ b/test/ecmascript/closest.html
@@ -2,7 +2,7 @@
 <html>
 <body>
 
-<div class="demo"> Grandparent
+<div class="demo container"> Grandparent
   <div class="demo container">Parent
     <div id="myElement" class="demo">The outer HTML of closest element will be shown.</div>
   </div>
