Just a bit more...According to the W3C, an id must be unique and is used to identify an html element, while the class assigns the class name to the element, and multiple elements can share the class name. Honestly, the id shouldn't be thought of as a way to apply a style, but more to identify an element, which in turn, css can specify a style to be applied to...it's a subtle difference, which I may have made even more confusing with my wording, but to me seems to be an important differenc. The link below should help a bit morehttp://www.w3.org/TR/html4/struct/global.html#h-7.5.2