Loofah 是一個 HTML 代碼清理庫，它可以修復被中斷的HTML標簽。

示例代碼：

  doc = Loofah.fragment(unsafe_html)  # returns a Nokogiri document ...
  doc.scrub!(:prune)                  # ... with one extra method
  doc.to_s                            # => "ohai! <div>div is safe</div> "
  doc.text                            # => "ohai! div is safe "