A syntax for specifying a CSS selector by means of a general purpose, repeatable class attribute of an element. The name of class selectors in style rules is preceded by a full stop or period, ., e.g.: .Condensed{ letter-spacing: 0.1em;
In a cascading style sheet's style definition (or style rule), a subset of a selector that controls whether the same selector can be used for slightly different styles in different situations.