Screenshot of a particular size with Ruby and Selenium

Install Selenium Webdrivers for Ruby

gem install webdrivers

Take a screenshot of the resized viewport and save to file

require 'webdrivers'

driver = Selenium::WebDriver.for :chrome

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

driver.manage.window.resize_to(480, 240)

driver.save_screenshot("./size.png")

Find out how to take a full-page screenshot with Ruby and Selenium.