The gem author Jonas Nicklas highlights in a Google Groups post Show archive.org snapshot that the release

• is not backwards compatible to 1.x versions of Capybara
• does not support Ruby 1.8.x anymore
• removes confusion with Rails' built in integration tests (you put capybara rspec integration tests into the spec/feature/... folder) and the :type metadata has been changed from :request to :feature
• throws exceptions when trying to interact with an element whose identifier is not unique on the page (in earlier versions it used the first detected element found by the identifier)
• has a new syntax for writing integration tests with capybara in rspec Show archive.org snapshot (describe => feature, it => scenario)

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Read more Show archive.org snapshot

Excerpt of some other major changes Show archive.org snapshot

• has_content? doesn't match hidden elements
• body now returns the unmodified source
• Node#wait_until and Session#wait_until have been removed. => Alternative: Node#synchronize