code: public JQMListItem addHeaderText(int n, String html) {
          Element e = Document.get().createHElement(n);
          e.setInnerHTML(html);
          attachChild(e);
          return this;
      }
docs: Adds a header element containing the given text.
  
  @param n - the Hn element to use, e.g. if n is 2 then a {@code <h2>} element is created.
  @param html - the value to set as the inner html of the {@code <hn>} element.