модуль Nokogiri::HTML5::Node

# File lib/nokogiri/html5/node.rb, line 65
def fragment(tags)
  return super(tags) unless document.is_a?(HTML5::Document)

  DocumentFragment.new(document, tags, self)
end

# File lib/nokogiri/html5/node.rb, line 28
def inner_html(options = {})
  return super(options) unless document.is_a?(HTML5::Document)

  result = options[:preserve_newline] && prepend_newline? ? +"\n" : +""
  result << children.map { |child| child.to_html(options) }.join
  result
end

# File lib/nokogiri/html5/node.rb, line 36
def write_to(io, *options)
  return super(io, *options) unless document.is_a?(HTML5::Document)

  options = options.first.is_a?(Hash) ? options.shift : {}
  encoding = options[:encoding] || options[0]
  if Nokogiri.jruby?
    save_options = options[:save_with] || options[1]
    indent_times = options[:indent] || 0
  else
    save_options = options[:save_with] || options[1] || XML::Node::SaveOptions::FORMAT
    indent_times = options[:indent] || 2
  end
  indent_string = (options[:indent_text] || " ") * indent_times

  config = XML::Node::SaveOptions.new(save_options.to_i)
  yield config if block_given?

  config_options = config.options
  if config_options & (XML::Node::SaveOptions::AS_XML | XML::Node::SaveOptions::AS_XHTML) != 0
    # Use Nokogiri's serializing code.
    native_write_to(io, encoding, indent_string, config_options)
  else
    # Serialize including the current node.
    html = html_standard_serialize(options[:preserve_newline] || false)
    encoding ||= document.encoding || Encoding::UTF_8
    io << html.encode(encoding, fallback: lambda { |c| "&#x#{c.ord.to_s(16)};" })
  end
end