def append(selector, html_to_append)
      select(selector).each { |node| node.append_fragment html_to_append }
    end
def append(selector, html_to_append)
      select(selector).each { |node| node.append_fragment html_to_append }
    end
Adds the given markup to the end of the selected elements.

 @param [String] selector a CSS or XPath string describing the elements to
   which this HTML should be appended
 @param [String] html_to_append the new markup to append to the selected
   element. Markup is not escaped.