class Nokogiri::HTML4::Document

def set_metadata_element(element) # rubocop:disable Naming/AccessorMethodName

rubocop:disable Naming/AccessorMethodName 
def set_metadata_element(element) # rubocop:disable Naming/AccessorMethodName
  if (head = at_xpath("//head"))
    head << element
  elsif (html = at_xpath("//html"))
    head = html.prepend_child(XML::Node.new("head", self))
    head.prepend_child(element)
  elsif (first = children.find do |node|
           case node
           when XML::Element, XML::Text
             true
           end
         end)
    # We reach here only if the underlying document model
    # allows <html>/<head> elements to be omitted and does not
    # automatically supply them.
    first.add_previous_sibling(element)
  else
    html = add_child(XML::Node.new("html", self))
    head = html.add_child(XML::Node.new("head", self))
    head.prepend_child(element)
  end
end