Five XHTML Elements You Didn’t Know But Were.
Added 26 Jul 2008
“Five XHTML Elements You Didn’t Know But Were
Afraid to Ask,” optgroup (option group)
element (that group a set of option elements), the label element
(provides captions for form elements), the fieldset element (creates a
frame), the label element (an optional element that creates a frame’s
title), the colgroup element (a table element), and the acronym element
(provides a definition through the title attribute).