CODEWITHSUNDEEP
pythongoogle-chromeseleniumselenium-webdriverselenium-chromedriver
DubiousDan
DubiousDan

Reputation: 201

How to detect if Chrome browser is headless in selenium?

I'm writing a selenium test which has different behavior given whether the chrome browser was started as headless or not. My question is in my test how do I detect if the browser is headless for my conditional flow?

Upvotes: 15

Views: 4856

Answers (5)

Sergio
Sergio

Reputation: 33

Considering this scenario:

from selenium import webdriver
from webdriver_manager.chrome import ChromeDriverManager
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.chrome.service import Service

chrome_options = Options()
chrome_options.add_argument("--headless")
chrome_options.add_argument("--window-size=1920,1080")
service = Service(ChromeDriverManager().install())
driver = webdriver.Chrome(service=service, options=chrome_options)

In my testing I found that driver.get_window_position() returns {'x': 0, 'y': 0} when running in headless mode. However when run without the headless option it defaults to {'x': 10, 'y': 10}.

I'm using this method to determine if my Chrome instance is running in headless mode by simply doing:

assert driver.get_window_position()['x'] == 0
assert driver.get_window_position()['y'] == 0

Upvotes: 3

scūriolus
scūriolus

Reputation: 968

I know the question is about Chrome, but if you're using Firefox, there is a cleaner solution (tested on Firefox 106):

if driver.caps.get("moz:headless", False):
     print("Firefox is headless")

Upvotes: 0

Carlost
Carlost

Reputation: 837

I just find this way for that.

Options its a list, so you have to find the "--headless" element in there.

opc = Options()
opc.add_argument('headless')

in this case, the position of the element in the list is [0], so you only have to to something like this:

if (opc.arguments[0]=="--headless"):
    print("Do something")

Upvotes: 1

user123456789
user123456789

Reputation: 91

https://antoinevastel.com/bot%20detection/2018/01/17/detect-chrome-headless-v2.html#:~:text=In%20order%20to%20automate%20Chrome,possible%20to%20detect%20Chrome%20headless.

driver.execute_script("return navigator.plugins.length == 0")

Upvotes: 7

Trevor K
Trevor K

Reputation: 125

You need to explicitly add the argument "--headless" to your chromeOptions object when starting an instance of chrome headlessly. If you're writing, for example, a test framework for a website you probably have some sort of browser creator class that is able to give you different browsers to work with. Why not save that argument as an additional member of that class?

Another simpler option if you don't have a that sort of factory design in your code is just 

options = webdriver.ChromeOptions
options.add_argument("--headless")
print(options.arguments)

Upvotes: -1

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