cucumber formatter html embed spec and patch

formatter_html_spec_embed.rb

# spec/cucumber/formatter/html_spec.rb
require File.dirname(__FILE__) + '/../../spec_helper'
require File.dirname(__FILE__) + '/spec_helper'
require 'cucumber/formatter/html'
require 'nokogiri'
require 'cucumber/rb_support/rb_language'

module Cucumber
  module Formatter

    describe Html do
      extend SpecHelperDsl
      include SpecHelper
    
      Spec::Matchers.define :have_css_node do |css, regexp|
        match do |doc|
          nodes = doc.css(css)
          nodes.detect{ |node| node.text =~ regexp }
        end
      end
    
      before(:each) do
        @out = StringIO.new
        @formatter = Html.new(step_mother, @out, {})
      end
    
      it "should not raise an error when visiting a blank feature name" do
        lambda { @formatter.feature_name("") }.should_not raise_error
      end
      
      describe "given a single feature" do
        before(:each) do
          run_defined_feature
          @doc = Nokogiri.HTML(@out.string)
        end
        
        # existing specs here

        # new spec
        describe "with a step that embeds a snapshot" do
          define_steps do
            Given(/snap/) { embed('snapshot.jpeg', 'image/jpeg') }
          end

          define_feature(<<-FEATURE)
            Scenario:
              Given snap
            FEATURE

          it { @doc.should have_css_node('.embed', /snap/) }
        end

      end
    end
  end
end


# lib/cucumber/formatter/html.rb
module Cucumber
  module Formatter
    class Html
      include ERB::Util # for the #h method
      include Duration
      include Io

     # initialize method untouched

     def embed(file, mime_type)
        case(mime_type)
        when /^image\/(png|gif|jpg|jpeg)/
          embed_image(file)
        end
      end

      def embed_image(file)
        id = file.hash
        @builder.span(:class => 'embed') do |pre|
          pre << %{<a href="" onclick="img=document.getElementById('#{id}'); img.style.display = (img.style.display == 'none' ? 'block' : 'none');return false">Screenshot</a><br>&nbsp;
          <img id="#{id}" style="display: none" src="#{file}"/>}
        end
      end

    # file continues

    end
  end
end

Can you add an option to set the size of the image (either by setting height/width directly, or by adding class="embed_image" and applying style by CSS?