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並前往https://www.w3.org/TR/2018/REC-selectors-3-20181106/

Selectors Level 3 - W3C

7.2. The ::first-letter pseudo-element. 7.2.1. Application in CSS. 7.3. Blank; 7.4. The ::before and ::after pseudo-elements. 8. Combinators.

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