code: function addTag(tag, ast, newLine) {
          lines.push(startTag(tag));
          if (ast instanceof Array)
              addArray(ast); 
          else
              mdAstToHtml(ast, lines);
          lines.push(endTag(tag));
          if (newLine)
              lines.push('\r\n');
          return lines;
      }
docs: Adds tagged content