require 'selenium-webdriver'

browser = Selenium::WebDriver.for :firefox
File.open("test.html", "w") { |file| file << "<h1>hello</h1>" }

begin
  browser.get "file://#{File.expand_path '../test.html', __FILE__}"
  puts browser.find_element(:tag_name => "h1").text
ensure
  browser.quit
end