Why can’t I set the font size of a visited link?
Notice that the visited link appears gray, as expected, but the font size hasn’t changed! This is because changing the font size would be a security vulnerability! If CSS could set the font size differently, I (Jim) could tell whether you’ve visited pornhub.com. But how?
▻https://jameshfisher.com/2019/03/08/why-cant-i-set-the-font-size-of-a-visited-link