You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: markdown.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/lib/rdoc
    
    the code of the file until where you have to start completion: # coding: UTF-8
# frozen_string_literal: true
# :markup: markdown

##
# RDoc::Markdown as described by the [markdown 
    
  def _HtmlBlockFrameset

    _save = self.pos
    while true # sequence
      _tmp = apply(:_HtmlBlockOpenFrameset)
      unless _tmp
        self.pos = _save
        break
      end