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ea1d69c64b
This makes them keyboard-accessible. For mouse users, the only change here is that the focus outline will remain on the button once clicked (in future, this can be solved with :focus-ring, but for now this would require a polyfill). the tooltip is explicitly hidden on `mouseleave`, so even though the `<button>` retains focus after clicking, the tooltip won't stay visible once mouse user moves away. the mouse hover styles have explicitly not been make to also apply to :focus, so as to minimise the visual impact for mouse users (though the tooltip remains visible) - but due to the default outline and the custom tooltip, it should be fairly clear when keyboard users set focus to a copy button too.
