from selenium import webdriver
op = webdriver.ChromeOptions()
op.binary_location = 'Opera/launcher.exe' # путь к экзешнику оперы
browser = webdriver.Opera( options = op )
browser.get( 'https://site.com/page' )
coords = browser.execute_script( 'return some_id.getBoundingClientRect()' )
print( coords )
browser.quit()