      <meta
            http-equiv="Content-Type"
            content="text/html; charset=ISO-8859-1"
        />
    </head>

    <body id="id-9" aria-atomic="true">
        <div aria-hidden="true">
            <div aria-hidden="false">
                <button tabindex="-1">Some button</button>
            </div>
        </div>
        <script type="text/javascript">
            UnitTest = {
                ruleIds: ["aria_hidden_nontabbable"],
                results: [
                    {
              