Update example markup for accessibility tree

Author: muan

examples/index.html

@@ -11,14 +11,14 @@
   <form>
     <label>
       Least favorite robot
-      <input aria-controls="list-id" role="combobox" type="text">
+      <input aria-controls="list-id" role="combobox" type="text" aria-expanded="true">
     </label>
     <ul role="listbox" id="list-id">
       <li id="baymax" role="option">Baymax</li>
       <li id="bb-8" role="option" aria-disabled="true"><del>BB-8</del></li>
       <li id="hubot" role="option">Hubot</li>
       <li id="r2-d2" role="option">R2-D2</li>
-      <li><a id="wall-e" href="#wall-e" role="option">Wall-E</a></li>
+      <li role="presentation"><a id="wall-e" href="#wall-e" role="option">Wall-E</a></li>
     </ul>
   </form>
   <pre class="events"></pre>