code: public final void removeClass(final Element root, final String selector,
              final String className) {
          final Iterable<Element> elements; // Elements selected
  
          checkNotNull(root, "Received a null pointer as root element");
          checkNotNull(selector, "Received a null pointer as selector");
          checkNotNull(className, "Received a null pointer as className");
  
          // Selects and iterates over the elements
          elements = root.select(selector);
          for (final Element element : elements) {
              element.removeClass(className);
  
              if (element.classNames().isEmpty()) {
                  element.removeAttr("class");
              }
          }
      }
docs: Finds a set of elements through a CSS selector and removes the received
  class from them, if they have it.
  <p>
  If the elements end without classes then the class attribute is also
  removed.
  
  @param root
  root element for the selection
  @param selector
  CSS selector for the elements with the class to remove
  @param className
  class to remove