from selenium import webdriver
from selenium.webdriver.common.by import By
driver = webdriver.Chrome('D:\python\chromedriver.exe')
driver.get('https://velog.io/@exoluse')
driver.set_window_size(1024, 768)
driver.save_screenshot('./screen.png')

이건 좀 신박했다.
element.screenshot('./element.png')

driver.execute_script('alert(arguments[0]);', element.text)