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HTML_CSS : The Definitive Guide

Grouping selectors

HTML_CSS::createGroup - Create a new CSS definition group
HTML_CSS::unsetGroup - Remove a CSS definition group
HTML_CSS::getGroupStyle - Return CSS definition for a CSS group
HTML_CSS::setGroupStyle - Set or add a CSS definition for a CSS group
HTML_CSS::addGroupSelector - Add a selector to a CSS definition group.
HTML_CSS::removeGroupSelector - Remove a selector from a group
HTML_CSS::setSameStyle - Apply same styles on two selectors

The most advanced/complex functions are those which handle group of selectors

HTML_CSS : The Definitive Guide v 1.5.0 : January 15, 2008