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: clean_html.rb
    path of file: ./repos/devdocs/lib/docs/filters/ember
    
    the code of the file until where you have to start completion: module Docs
  class Ember
    class CleanHtmlFilter < Filter
      def call
        css('hr
    
      def guide
        # Remove code highlighting
        css('.filename').each do |node|
          node.content = node.at_css('pre code').content
          node.name = 'pre'
          node['data-language'] = node['class'][/(javascript|js|html|hbs|handlebars)/, 1]
          node['data-language'] = node['data-language'].sub(/(hbs|handlebars)/, 'html')
        end

        if root_page?
          at_css('h1').content = 'Ember.js'
        end