railties/lib/rails/generators/rails/app/templates/app/controllers/application_controller.rb.tt
class ApplicationController < ActionController::<%= options.api? ? "API" : "Base" %>
<%- unless options.api? -%>
# Only allow modern browsers supporting webp images, web push, badges, import maps, CSS nesting, and CSS :has.
allow_browser versions: :modern
<% end -%>
end