Web Design in a Nutshell, 3rd Edition

Semantic Class Names

HTML 4 has a limited set of built-in semantics. In 2004, a few web developers realized that by using carefully chosen sets of class names based on existing publishing behaviors and widely adopted Internet standards, they could extend HTML to meaningfully publish information about contacts, events, reviews, and other web data types. This section introduces microformats created for handling contact information and calendar events.