<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Accessible Navigation</title>
    <link rel="stylesheet" href="navigation.css" />
</head>
<body>
    <p>Choose an animal from the below menu. You can use TAB to visit each menu item.</p>
    <ul>
        <li tabindex="0">Platypus</li>
        <li tabindex="0">Kangaroo</li>
        <li tabindex="0">
            Cats >
            <ul>
                <li tabindex="0">Siamese</li>
                <li tabindex="0">Persian</li>
                <li tabindex="0">Sphynx</li>
            </ul>
        </li>
        <li tabindex="0">Whale</li>
        <li tabindex="0">Pterodactyl</li>
        <li tabindex="0">
            Dogs >
            <ul>
                <li tabindex="0">Bulldog</li>
                <li tabindex="0">Poodle</li>
                <li tabindex="0">Pug</li>
            </ul>
        </li>
    </ul>
    <script src="navigation.js"></script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Accessible Navigation</title>
    <link rel="stylesheet" href="navigation.css" />
</head>
<body>
    <p>Choose an animal from the below menu. You can use TAB to visit each menu item.</p>
    <div class="nav-wrapper">
        <ul class="nav">
            <li tabindex="0">Platypus</li>
            <li tabindex="0">Kangaroo</li>
            <li tabindex="0">
                Cat >
                <ul>
                    <li tabindex="0">Siamese</li>
                    <li tabindex="0">Persian</li>
                    <li tabindex="0">Sphynx</li>
                </ul>
            </li>
            <li tabindex="0">Whale</li>
            <li tabindex="0">Pterodactyl</li>
            <li tabindex="0">
                Dogs >
                <ul>
                    <li tabindex="0">Bulldog</li>
                    <li tabindex="0">Poodle</li>
                    <li tabindex="0">Pug</li>
                </ul>
            </li>
        </ul>
    </div>
    <script src="navigation.js"></script>
</body>
</html>

Update HTML for navigation example.
Update HTML for navigation example.