Exactly what I thought. The CSS make a visual indentation, but carries no more semantic than the data structure does already. In fact, if it did, I would consi

Exactly what I thought. The CSS make a visual indentation, but carries no more semantic than the data structure does already. In fact, if it did, I would consider the HTML broken. <div class=comment.level1> ... </div> <div class=comment.level2> ... </div