选择 | Selectors 目录 :-ms-input-placeholder ::after ::before ::first-letter ::first-line :active :any :any-link :checked :dir :disabled :empty :enabled :first-child :first-of-type :focus :focus-within :hover :in-range :invalid :lang :last-child :last-of-type :link :not :nth-child :nth-last-child :nth-last-of-type :nth-of-type :only-child :only-of-type :out-of-range :placeholder-shown :read-only :read-write :root :scope :target :valid :visited 相邻兄弟选择器 | Adjacent sibling selectors 属性选择器 | Attribute selectors 子选择器 | Child selectors 类选择器 | Class selectors CSS选择器 | CSS Selectors 一般兄弟选择器 | General sibling selectors ID选择器 | ID selectors 伪类 | Pseudo-classes 类型选择器 | Type selectors 通用选择器 | Universal selectors
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