// Eliminating units for zero values.
new EliminateUnitsFromZeroNumericValues(cssTree.getMutatingVisitController()).runPass();
// Optimize color values.
new ColorValueOptimizer(cssTree.getMutatingVisitController()).runPass();
// Compress redundant top-right-bottom-left value lists.
new AbbreviatePositionalValues(cssTree.getMutatingVisitController()).runPass();
}
if (eliminateDeadStyles) {
// Report errors for duplicate declarations
new DisallowDuplicateDeclarations(cssTree.getVisitController(), errorManager).runPass();