How to simulate keyboard events in Capybara and Poltergeist

```ruby Then(/^when I press backspace in '(.*?)'$/) do |input| focus_field(input) find_field(input).native.send_keys(:Backspace) end ``` Details: https://github.com/teampoltergeist/poltergeist/blob/master/spec/integration/driver_spec.rb#L1203