One thing I love about the new'ish :focus-visible pseudo-state is that it allows me to create bigger, bolder, and more obvious focus states for my keyboard users than I normally would with a :focus pseudo-state.
Focus states are one of the areas of accessibility that are easy to neglect when you don't use your keyboard to navigate everyday. I went on a deep dive fixing some accessibility issues on my site last month and found all kinds of issues with focus. So I fixed them using :focus-visible.
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