Hierarchical comments usability issues
What are the best options to highlight a reply to a comment ? I'm thinking 3 levels maximum.
User Experience Stack Exchange is a question and answer site for user experience researchers and experts. It only takes a minute to sign up.Sign up to join this community
I would have to say that indentation are the best. Is there a reason why you don't want to do indenting?
But if that is not an option I could see borders being used. A thinker right border would cause a slight indentation. the deeper the comment the bigger the right border. See example below.