title_body: How can I highlight visited anchors in an epub?
upvoted_answer: You can use a couple CSS selectors to style links.
  
  a:link will select and style all unvisited links, while a:visited, surprisingly enough, will do the same with visited ones.
  
  Examples:
  
  a:link { 
      text-decoration: underline;
  }
  
  
  
  
  a:visited { 
      background-color: grey;
  }
  
  
  Remember that epub files are often read on B&amp;W e-ink devices, so you should consider this if you want to differentiate links by using colors; the result might not be as expected.