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当列表只有一个元素时，我想为列表项设置不同的样式，有没有办法只用 CSS 来做到这一点？
你想要的选择器是:only-child
:only-child
所以你可以在 css:li:only-child { }或p:only-child {}Apply-it 上使用你的元素
li:only-child { }
p:only-child {}