It matches a P element that is a descendant of an LI; the LI element must be the child of an OL element; the OL element must be a descendant of a DIV.
它匹配一个LI元素的后代P元素；而li必须是OL元素的子元素；而OL元素必须是DIV元素的后代。
Each div is hidden until a user clicks the corresponding li element, which gets styled as a tab.
每个div 最初被隐藏，直到用户单击对应的li元素（显示为选项卡）。
Each div is hidden until a user clicks the corresponding li element, which gets styled as a tab.
每个div 最初被隐藏，直到用户单击对应的li元素（显示为选项卡）。
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