<form action="#" method="post">
    <label for="dropdown">Pilih halaman:</label>
    <select id="dropdown" name="dropdown">
        <option value="">Pilih halaman...</option>
        <option value="https://example.com/page1">Halaman 1</option>
        <option value="https://example.com/page2">Halaman 2</option>
        <option value="https://example.com/page3">Halaman 3</option>
    </select>
    <input type="submit" value="Buka Halaman">
</form>