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: allowlisted_generic_onebox.rb
    path of file: ./repos/discourse/lib/onebox/engine
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "htmlentities"
require "ipaddr"

module Onebox
  module Engine
    class AllowlistedGenericOnebox
      include Engine
      include StandardEmbed
      include LayoutSupport

      def self.priority
        200
      end
    
      def card_html
        escaped_url = ::Onebox::Helpers.normalize_url_for_output(data[:player])

        <<~HTML
        <iframe src="#{escaped_url}"
                width="#{data[:player_width] || "100%"}"
                height="#{data[:player_height]}"
                scrolling="no"
                frameborder="0">
        </iframe>
        HTML
      end