public String retrieveCSSProperty(
     Object element, String property, String pseudo, CSSEngine engine) throws Exception {
   logIfNecessary(property);
   return delegate.retrieveCSSProperty(element, property, pseudo, engine);
 }
 public boolean applyCSSProperty(
     Object element, String property, CSSValue value, String pseudo, CSSEngine engine)
     throws Exception {
   logIfNecessary(property);
   return delegate.applyCSSProperty(element, property, value, pseudo, engine);
 }