CSS样式菜单标记的最佳实践是什么？

<nav>
  <ul>
    <li><a href="#">Home</a></li>
    <li><a href="#">About</a></li>
    <li>
      <a href="#">Products</a>
      <ul>
        <li><a href="#">Product 1</a></li>
        <li><a href="#">Product 2</a></li>
        <li><a href="#">Product 3</a></li>
      </ul>
    </li>
    <li><a href="#">Contact</a></li>
  </ul>
</nav>

nav ul {
  display: flex;
  list-style-type: none;
  padding: 0;
}

nav li {
  position: relative;
}

nav a {
  display: block;
  padding: 0.5rem 1rem;
  text-decoration: none;
  color: #333;
  font-size: 1rem;
}

nav ul ul {
  position: absolute;
  top: 100%;
  left: 0;
  display: none;
  background-color: #fff;
  border: 1px solid #ccc;
}

nav ul li:hover > ul {
  display: block;
}

nav ul ul li {
  width: 200px;
}