code: public static IStandardCSSSerializer getCSSSerializer(final IEngineConfiguration configuration) {
          final Object serializer =
                  configuration.getExecutionAttributes().get(STANDARD_CSS_SERIALIZER_ATTRIBUTE_NAME);
          if (serializer == null || (!(serializer instanceof IStandardCSSSerializer))) {
              throw new TemplateProcessingException(
                      "No CSS Serializer has been registered as an execution argument. " +
                      "This is a requirement for using Standard serialization, and might happen " +
                      "if neither the Standard or the SpringStandard dialects have " +
                      "been added to the Template Engine and none of the specified dialects registers an " +
                      "attribute of type " + IStandardCSSSerializer.class.getName() + " with name " +
                      "\"" + STANDARD_CSS_SERIALIZER_ATTRIBUTE_NAME + "\"");
          }
          return (IStandardCSSSerializer) serializer;
      }
docs: <p>
  Obtain the CSS serializer (implementation of {@link IStandardCSSSerializer}) registered by
  the Standard Dialect that is being currently used.
  </p>
  
  @param configuration the configuration object for the current template execution environment.
  @return the variable expression evaluator object.