> The minute you introduce a microformat into your HTML, the semantics of the class attribute have been permanently altered. http://www.w3.org/TR/html401/struc

> The minute you introduce a microformat into your HTML, the semantics of the class attribute have been permanently altered. http://www.w3.org/TR/html401/struct/global.html#h-7.5.2 http://www.w3.org/TR/html401/struct/global.html#h-7.5.2 > The class attribute has several roles in HTML: > * As a style sheet selector (when an author wishes to assign style information to a set of elements). > * For general purpose processing by user agents. So not really, he just doesn't know what the semantics always were. Understandable, since like most people he probably first encountered the class attribute as part of learning CSS. The rest of the article has some decent points.