code: public static HtmlTree A_ID(String id, Content body) {
          HtmlTree htmltree = new HtmlTree(HtmlTag.A);
          htmltree.addAttr(HtmlAttr.ID, nullCheck(id));
          htmltree.addContent(nullCheck(body));
          return htmltree;
      }
docs: Generates an HTML anchor tag with id attribute and a body.
  
  @param id id for the anchor tag
  @param body body for the anchor tag
  @return an HtmlTree object