# File lib/html/pipeline/absolute_source_filter.rb, line 19
      def call
        doc.search('img').each do |element|
          next if element['src'].nil? || element['src'].empty?
          src = element['src'].strip
          next if src.start_with? 'http'
          base = if src.start_with? '/'
                   image_base_url
                 else
                   image_subpage_url
                 end
          element['src'] = URI.join(base, src).to_s
        end
        doc
      end