How to take a full page screenshot with Ruby and Selenium

Install Selenium Webdrivers for Ruby

gem install webdrivers

Take full page screenshot and save to file

require 'webdrivers'

options = Selenium::WebDriver::Chrome::Options.new
options.add_argument('--headless')

driver = Selenium::WebDriver.for :chrome, options: options

driver.get "https://www.bbc.co.uk/news/business-63709754"

width  = driver.execute_script("return Math.max(document.body.scrollWidth,document.body.offsetWidth,document.documentElement.clientWidth,document.documentElement.scrollWidth,document.documentElement.offsetWidth);")
height = driver.execute_script("return Math.max(document.body.scrollHeight,document.body.offsetHeight,document.documentElement.clientHeight,document.documentElement.scrollHeight,document.documentElement.offsetHeight);")

driver.manage.window.resize_to(width, height)

driver.manage.window.maximize

sleep 5

driver.save_screenshot("./full-page.png")

Find out how to change the size of the viewport with Ruby and Selenium.