What sets apart adjusting window size through Options versus using the set_window_size method?

Seeking guidance on adjusting window size in Selenium. Discovered a helpful solution at How to set window size in Selenium Chrome Python

rom 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()

Questioning the difference between:

options.add_argument("window-size=1400,600")

and:

driver.set_window_size(1920, 1080)

On my Windows machine, I disabled headless mode and experimented with the code. When using 

driver.set_window_size(1920, 1080)
, the browser window's size changes visibly. However, with 
options.add_argument("window-size=1920, 1080")
, no noticeable change occurs. Is 
options.add_argument("window-size=1920, 1080")
specifically designed for headless mode?

seleniumselenium-webdriver

Answer №1

Adjusting the size of the driver window using

driver.set_window_size(1920, 1080)

and achieving the same result with Options
options.add_argument("window-size=1920,1080")

appear to be equivalent.
It's akin to
driver.get(url)
versus
driver.navigate().to(url)
Both are WebDriver methods that essentially perform the identical function and can be considered synonyms.
The only distinction I observed between setting the driver window size via
driver.set_window_size(1920, 1080)
versus 
options.add_argument("window-size=1920,1080")

is that adjusting or changing the driver window size through
driver.set_window_size(1920, 1080)

can be done at any point in your code, even multiple times, while setting the driver window size using
options.add_argument("window-size=1920,1080")

can only be done once, prior to creating the driver instance with
driver = webdriver.Chrome(chrome_options=options, executable_path=the_path
)

Answer №2

Upon reviewing the source code:

  1. set_window_size

Code snippet:

def set_window_size(self, width, height, windowHandle='current'):
    """
    Adjusts the current window's width and height. (window.resizeTo)

    :Args:
     - width: specify the pixel width for the window
     - height: specify the pixel height for the window

    :Usage:
        driver.set_window_size(800,600)
    """
    if self.w3c:
        if windowHandle != 'current':
            warnings.warn("Only 'current' window is supported for W3C compatibile browsers.")
        self.set_window_rect(width=int(width), height=int(height))
    else:
        self.execute(Command.SET_WINDOW_SIZE, {
            'width': int(width),
            'height': int(height),
            'windowHandle': windowHandle})

The function explicitly sets

the width and height of the current window

using two arguments:

- width: specifies the width in pixels to resize the window to
- height: specifies the height in pixels to resize the window to
  1. add_argument

Code snippet:

def add_argument(self, argument):
    """
    Includes an argument in the list

    :Args:
     - Defines the argument to be added
    """
    if argument:
        self._arguments.append(argument)
    else:
        raise ValueError("argument can not be null")

Regarding your inquiry:

I eliminated the headless option on my Windows machine and tried out the code. Using 

driver.set_window_size(1920, 1080)
, I noticed a change in browser size. Whereas with 
options.add_argument("window-size=1920,
1080")
, no visual alteration occurred. Is 
options.add_argument("window-size=1920, 1080")
solely for headless mode?

Using 

driver.set_window_size(1920, 1080)
resulted in a visible adjustment in window size as expected.

However, implementing 

options.add_argument("window-size=1920, 1080")
did not provoke any change. This option should ideally launch in a 1920x1080 resolution. add_argument merely appends an arg to the list. Including 
options.add_argument("--headless")
is discretionary.

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