Grouping is gathering (1) into a comma separated list two or more selectors that share the same style or (2) into a semicolon separated list two or more declarations that are attached to the same selector (2). 1. The selectors LI, P with class name .first and class .footnote share the same style, e.g.: LI {font-style: italic} P.first {font-style: italic} .footnote {font-style: italic} To reduce the size of style sheets and also save some typing time they can all be grouped in one list. LI, P.first, .footnote {font-style: italic} 2. The declarations {font-style: italic} and {color: red} can be attached to one selector, e.g.: H2 {font-style: italic} H2 {color: red} and can also be grouped into one list: H2 {font-style: italic; color: red}

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