mozilla-release/testing/web-platform/tests/conformance-checkers/html-aria/roles-properties-supported/roles-properties-supported-tree-aria-required-true.html

<!DOCTYPE html>
<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>&lt;div&gt; with role tree; supported state or property "aria-required" value of "true"</title>
   </head>
   <body>
      <div id="test" role="tree" aria-required="true">
         <div role="treeitem" id="obj1">obj1</div>
         <div role="treeitem" id="obj2">obj2</div>
      </div>
   </body>
</html>