Add a header that tells Internet Explorer (all versions) to use the best available standards support. This ensures that IE doesn't go into quirks mode because it has been blacklisted by too many users pressing the incompatible button. It also tells IE to use the ChromeFrame renderer, if the user has installed the plugin.

This guarantees that the best available standards support will be used on the client.

3 files changed, 3 insertions, 2 deletions

diff --git a/railties/lib/rails/application.rb b/railties/lib/rails/application.rb
index 3f9bca0bd6..6622cfdd2f 100644
--- a/railties/lib/rails/application.rb
+++ b/railties/lib/rails/application.rb
@@ -205,6 +205,7 @@ module Rails
         middleware.use ::ActionDispatch::ParamsParser
         middleware.use ::Rack::MethodOverride
         middleware.use ::ActionDispatch::Head
+        middleware.use ::ActionDispatch::BestStandardsSupport if config.action_dispatch.best_standards_support
       end
     end
 
diff --git a/railties/lib/rails/commands.rb b/railties/lib/rails/commands.rb
index b9353ba336..60a93c9848 100644
--- a/railties/lib/rails/commands.rb
+++ b/railties/lib/rails/commands.rb
@@ -70,4 +70,4 @@ In addition to those, there are:
 
 All commands can be run with -h for more information.
   EOT
-end
\ No newline at end of file
+end
diff --git a/railties/lib/rails/engine/configuration.rb b/railties/lib/rails/engine/configuration.rb
index 2f465670cf..521ed95447 100644
--- a/railties/lib/rails/engine/configuration.rb
+++ b/railties/lib/rails/engine/configuration.rb
@@ -50,4 +50,4 @@ module Rails
       end
     end
   end
-end
\ No newline at end of file
+end