`:focus-visible` and backwards compatibility

Patrick H. Lauke covers the future CSS pseudo class :focus-visible. We're in the early days of browser support, but it aims to solve an awkward situation:

... focus styles can often be undesirable when they are applied as a result of a mouse/pointer interaction. A classic example of this are buttons which trigger a particular action on a page, such as advancing a carousel. While it is important that a keyboard user is able to see when their focus …

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