How to set window size in Selenium Chrome Python

A bit unclear why and exactly where you are stuck. Possibly the extra . as in height = {}px. is creating the chaos. Perhaps along with -headless argument I am able to set/retrieve the Chrome browser Window Size as follows:

• Code Block:

  from selenium import webdriver
  from selenium.webdriver.chrome.options import Options
  
  options = Options()
  options.add_argument("--headless")
  options.add_argument("window-size=1400,600")
  driver = webdriver.Chrome(chrome_options=options, executable_path=r'C:\Utility\BrowserDrivers\chromedriver.exe', service_args=["--log-path=./Logs/DubiousDan.log"])
  driver.get("http://google.com/")
  print ("Headless Chrome Initialized")
  print(driver.get_window_size())
  driver.set_window_size(1920, 1080)
  size = driver.get_window_size()
  print("Window size: width = {}px, height = {}px".format(size["width"], size["height"]))
  driver.quit()
  

• Console Output:

  Headless Chrome Initialized
  {'width': 1400, 'height': 600}
  Window size: width = 1920px, height = 1080px
  

tl; dr

You find a couple of relevant discussion on window size in:

• python: Selenium Firefox headless returns different results
• java: Not able to maximize Chrome Window in headless mode