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例えばRailsのFeature Specsなんかでリンクをクリックするとページ遷移せずに新しいタブが開いて、そちらのタブの内容をCapybaraでテストしたい場合があると思います。通常は新しいタブが開いても元のページのままなのですが、Poltergeistのwithin_windowというメソッドを使うとタブを移動することが出来ます。

handle = page.driver.browser.window_handles.last

page.driver.browser.within_window(handle) do
  # ブロック内ではタブが移動
  expect(page).to have_css('canvas')


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