I subscribe to several SE sites. I've noticed that the question links on the Questions page are rendered differently on the AskDifferent site than they are on the other sites I visit: After clicking the link to a question, and returning to the Questions page, the question(s) I've read are not rendered in a different color; i.e. visited links are indistinguishable from those that have not been visited. This seems to be true only on the AskDifferent site.
Is this "by design"??