:focus-visible allows you to work out if something has focus because it was clicked (not what you usually want) or if it's been tabbed to via a keyboard (what you want).
Every linked element relies on ids: anchors, the label for attribute, all of the aria-labelledby, controls, describedby etc. Sure a full selector would be better but what level of css selectors do you support when writing the spec for user agents to know that can support the element?