class Nokogiri::HTML4::Document

def title=(text)

content element (typically ) if any.
encoding/charset tag if any, and before any text node or
is inside a head element if any, right after a meta
place supplying head and/or html elements as necessary, which
Otherwise, this method tries to create one at an appropriate

with the given text.
If a title element is already present, its content is replaced

Set the title string of this document.
## 
def title=(text)
  tnode = XML::Text.new(text, self)
  if (title = at_xpath("//title"))
    title.children = tnode
    return text
  end
  title = XML::Node.new("title", self) << tnode
  if (head = at_xpath("//head"))
    head << title
  elsif (meta = at_xpath("//meta[@charset]") || meta_content_type)
    # better put after charset declaration
    meta.add_next_sibling(title)
  else
    set_metadata_element(title)
  end
end