new SplitRulesetNodes(cssTree.getMutatingVisitController()).runPass();
// Dead code elimination.
new MarkRemovableRulesetNodes(cssTree).runPass();
new EliminateUselessRulesetNodes(cssTree).runPass();
// Merge of rules with same selector.
new MergeAdjacentRulesetNodesWithSameSelector(cssTree).runPass();
new EliminateUselessRulesetNodes(cssTree).runPass();
// Merge of rules with same styles.
new MergeAdjacentRulesetNodesWithSameDeclarations(cssTree).runPass();
new EliminateUselessRulesetNodes(cssTree).runPass();
}