diff --git a/examples/listbox/listbox-grouped.html b/examples/listbox/listbox-grouped.html
index 3660cfcef7..86e22e1b1f 100644
--- a/examples/listbox/listbox-grouped.html
+++ b/examples/listbox/listbox-grouped.html
@@ -46,7 +46,7 @@ <h2 id="ex_label">Example</h2>
           <span id="ss_elem" class="listbox-label">Choose your animal sidekick</span>
           <div id="ss_elem_list" tabindex="0" role="listbox" aria-labelledby="ss_elem">
             <ul role="group" aria-labelledby="cat1">
-              <li role="presentation" id="cat1">Land</li>
+              <li aria-hidden="true" id="cat1">Land</li>
               <li id="ss_elem_1" role="option">Cat</li>
               <li id="ss_elem_2" role="option">Dog</li>
               <li id="ss_elem_3" role="option">Tiger</li>
@@ -54,13 +54,13 @@ <h2 id="ex_label">Example</h2>
               <li id="ss_elem_5" role="option">Raccoon</li>
             </ul>
             <ul role="group" aria-labelledby="cat2">
-              <li role="presentation" id="cat2">Water</li>
+              <li aria-hidden="true" id="cat2">Water</li>
               <li id="ss_elem_6" role="option">Dolphin</li>
               <li id="ss_elem_7" role="option">Flounder</li>
               <li id="ss_elem_8" role="option">Eel</li>
             </ul>
             <ul role="group" aria-labelledby="cat3">
-              <li role="presentation" id="cat3">Air</li>
+              <li aria-hidden="true" id="cat3">Air</li>
               <li id="ss_elem_9" role="option">Falcon</li>
               <li id="ss_elem_10" role="option">Winged Horse</li>
               <li id="ss_elem_11" role="option">Owl</li>