Install html_output plugin. [#30]

vendor/plugins/html_output/README.textile

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+h2. HTML Output
+
+This miniscule Rails plugin stops Rails outputting self-closing (XHTML-style) markup
+which is useful if you want to use the Rails tag helpers and produce valid HTML.

vendor/plugins/html_output/init.rb

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+require 'html_output'

vendor/plugins/html_output/lib/html_output.rb

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+require 'active_support'
+
+module ActionView::Helpers::TagHelper
+  # Forces the "open" param to always be true so it never self-closes
+  def tag_with_non_self_closing(name, options = nil, open = false, *args)
+    tag_without_non_self_closing name, options, true
+  end
+
+  alias_method_chain :tag, :non_self_closing
+end
+
+class ActionView::Helpers::InstanceTag
+  # We have to re-alias tag_without_error_wrapping because it is previously
+  # aliased to the old version of tag, which self-closes
+  alias_method :tag_without_error_wrapping, :tag_with_non_self_closing
+end

vendor/plugins/html_output/test/test.rb

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+%w(rubygems active_support action_controller action_view test/unit).each { |r| require r }
+require File.join(File.dirname(File.dirname(__FILE__)), 'lib', 'html_output')
+
+class HtmlOutputTest < Test::Unit::TestCase
+  include ActionView::Helpers::TagHelper
+
+  def test_tag
+    assert_not_self_closing tag("br")
+    assert_not_self_closing tag("link", :rel => "stylesheet")
+    assert_not_self_closing tag("link", {:rel => "stylesheet"}, true)
+    assert_not_self_closing tag("link", {:rel => "stylesheet"}, true, false)
+  end
+
+  def test_instance_tag
+    assert_not_self_closing ActionView::Helpers::InstanceTag.new("test", "foo", self).to_input_field_tag("text")
+  end
+
+  private
+
+  def assert_not_self_closing tag
+    assert_nil tag["/"]
+  end
+end