One problem though is that the default link colors can be unreadable in dark mode. That's why I use @media (prefers-color-scheme: dark) to set a:link, a:visited, a:active colors.
i like the default (unstyled) link colors chrome uses, they seemingly do accessibility the best. on the other hand, safari's default link colors for dark mode are quite poor, e.g., a:link is dark blue, a:visited is purple
worth noting, browsers also treat the default dark mode background colors differently: chrome uses black, safari uses dark gray, and firefox uses dark navy
