Hi. I have succeeded to highlight child and parent categories, in categories page. Here you can check it: WordPress Website The problem is, it seems that WordPress doesn´t put the 'current-cat', and 'current-cat-parent' classes, on the post page (I believe it is 'single.php' file). Does anybody know a way to generate those classes in the categories list, in the post page?
Right. It doesn't, and I had the same problem once when I had to style the categories children and their children as well. You can do it all with CSS selectors, its not that difficult. Check out how I did it. http://degitech.co.uk/blogs/