Keep it on the DL

I came across what has got to be the most rarely used HTML element. Ever heard of <dl>? me neither. Stands for "Definition List". Inside a DL you put Definition Terms (DT) and inside a DT you put a Definition Description (DD). It actually is a very handy way to markup key/value pairs, such as "firstname: bob" or "Age:34". So if you've got some kind of Object and you want to markup its fields, give the DL a try.