module Nokogiri::HTML5::Node

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.
    encoding ||= document.encoding || Encoding::UTF_8
    internal_ops = {
      preserve_newline: options[:preserve_newline] || false,
    }
    HTML5.serialize_node_internal(self, io, encoding, internal_ops)
  end
end