code: public String getChildText() {
          final List<AbstractHtml> children = getChildren();
          if (children.size() > 0) {
              final StringBuilder builder = new StringBuilder();
              for (final AbstractHtml child : children) {
                  builder.append(child.toHtmlString());
              }
              return builder.toString();
          }
          return "";
      }
docs: gets the child text set for this tag.
  
  @return the child text set for this tag in string format. If there is no
  children/child text then will return empty string.
  @since 2.1.4