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並前往https://www.khanacademy.org/computing/computer-programming/html-css/more-css-selectors/pt/css-dynamic-pseudo-classes

CSS dynamic pseudo-classes | More CSS selectors - Khan ...

what does the 'a' stand for before the :hover, :active, and :focus? ... I watched the whole video, I still don't know what the a:focus CSS selector does.

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