use headless_chrome

headless_chrome.rb

require 'capybara'
require 'selenium-webdriver'

Capybara.register_driver :chrome do |app|
  Capybara::Selenium::Driver.new(app, browser: :chrome)
end

Capybara.register_driver :headless_chrome do |app|
  capabilities = Selenium::WebDriver::Remote::Capabilities.chrome(
    chromeOptions: { args: %w[headless disable-gpu] }
  )
  Capybara::Selenium::Driver.new(
    app,
    browser: :chrome,
    desired_capabilities: capabilities
  )
end
Capybara.javascript_driver = :headless_chrome

session = Capybara::Session.new(:headless_chrome)

url = "https://instant.io/"
session.visit(url)

session.attach_file('upload', '4_Pieces.html')

sleep 5

puts session.all('a')[1][:href]

puts Process.pid

Process.daemon

puts Process.pid