# File lib/action_view/helpers/form_tag_helper.rb, line 468
      def button_tag(content_or_options = nil, options = nil, &block)
        options = content_or_options if block_given? && content_or_options.is_a?(Hash)
        options ||= {}
        options = options.stringify_keys

        if disable_with = options.delete("disable_with")
          ActiveSupport::Deprecation.warn ":disable_with option is deprecated and will be removed from Rails 4.0. Use 'data-disable-with' instead"

          options["data-disable-with"] = disable_with
        end

        if confirm = options.delete("confirm")
          ActiveSupport::Deprecation.warn ":confirm option is deprecated and will be removed from Rails 4.0. Use ':data => { :confirm => \'Text\' }' instead"

          options["data-confirm"] = confirm
        end

        options.reverse_merge! 'name' => 'button', 'type' => 'submit'

        content_tag :button, content_or_options || 'Button', options, &block
      end