code: public boolean mergeCSSFrom(CSSClassManager other) throws CSSNamingConflict {
      for (CSSClass clss : other.getClasses()) {
        this.addClass(clss);
      }
      return true;
    }
docs: Merge CSS classes, for example to merge two plots.
  
  @param other Other class to merge with
  @return success code
  @throws CSSNamingConflict If there is a naming conflict.