The Formatter::HTML should not inherit from the MessageBuilder

CHANGELOG.md

@@ -25,7 +25,10 @@ Please visit [cucumber/CONTRIBUTING.md](https://github.com/cucumber/cucumber/blo
   logic and some old rspec helper files)
 - Removed handling of a Ruby 2.1 system error ([luke-hill](https://github.com/luke-hill))
 - Removed support for Ruby 3.1 and 3.2 (Minimum ruby is now 3.3) ([luke-hill](https://github.com/luke-hill))
-
+
+### Fixed
+- Updated the `html-formatter` to access message stream correctly ([#1899](https://github.com/cucumber/cucumber-ruby/pull/1899)) [brasmusson](https://github.com/brasmusson)
+
 ## [11.1.1] - 2026-06-25
 ### Changed
 - Change to use events to pass the data from "log" and "attach" calls from the step definitions to the formatters. With this the last part of the ancient (pre event) formatter inteface has been removed. ([#1881](https://github.com/cucumber/cucumber-ruby/pull/1881) [brasmusson](https://github.com/brasmusson))

features/docs/formatters/html.feature

@@ -19,3 +19,7 @@ Feature: html formatter
     When I run `cucumber features/my_feature.feature --format html`
     Then it should fail
     And output should be html with title "Cucumber"
+    And the output should contain:
+    """
+    Scenario Outline: a scenario
+    """

lib/cucumber/formatter/html.rb

@@ -2,20 +2,22 @@
 
 require 'cucumber/html_formatter'
 
-require_relative 'message_builder'
+require_relative 'io'
 
 module Cucumber
   module Formatter
-    class HTML < MessageBuilder
+    class HTML
+      include Io
+
       def initialize(config)
+        @config = config
         @io = ensure_io(config.out_stream, config.error_stream)
         @html_formatter = Cucumber::HTMLFormatter::Formatter.new(@io)
         @html_formatter.write_pre_message
-        super(config)
+        config.on_event :envelope, &method(:on_envelope)
       end
 
       def on_envelope(event)
-        super(event)
         envelope = event.envelope
         @html_formatter.write_message(envelope)
         # TODO: Move this conditional logic into the HTML formatter proper

lib/cucumber/runtime.rb

@@ -172,14 +172,13 @@ def set_encoding
     require 'cucumber/core/report/summary'
 
     def create_formatters
-      # Define all formatters which are specified via cli options
-      formatters
-      # Define the MessageBuilder formatter - Required until all messages are generated at the source
-      #   Skip when a user formatter already inherits from MessageBuilder (e.g. HTML) to avoid sending every event twice.
-      message_builder unless formatters.any? { |f| f.is_a?(Formatter::MessageBuilder) }
+      # Define the MessageBuilder - Required until all messages are generated at the source
+      message_builder
       # `summary_report` and `global_hooks_summary_report` are used to determine the exit code
       summary_report
       global_hooks_summary_report
+      # Define all formatters which are specified via cli options
+      formatters
       fail_fast_report if @configuration.fail_fast?
       publish_banner_printer unless @configuration.publish_quiet?
     end