Narrow down scope with `within` in Capybara Rails testing

expect(find('div.greet > h1').text).to eq 'Hello'
expect(find('div.greet > p.message').text).to eq "world"

within('div.greet') do
  expect(find('h1').text).to eq 'Hello'
  expect(find('p.message').text).to eq "world"
end