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Pseudo-classes - CSS | MDN

https://developer.mozilla.org/en-US/docs/Web/CSS/Pseudo-classes

“A CSS pseudo-class is a keyword added to a selector that lets you style a specific state of the selected element(s). For example, the pseudo-class :hover can be used to select a button when a user's pointer hovers over the button and this selected button can then be styled.” (the page’s own description)

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