An incremental change, perhaps, over the previous work with CSS dropdowns, but another angle for you to explore for those instances where it really is useful to have the navigation options displayed rather than hidden inside a dropdown menu.

• 添加了一些改变，也许，透过之前的工作，可以让你从另一个视角来探索那些例子是否它们对让菜单项显示的价值大于它们隐藏在下拉菜单里的价值。