Selenium startup parameters using ChromeOptions

Selenium is a multi-platform multi-browser + + multi-automated test version of the browser frame.
Selenium when you start the browser can be specified parameters need to start by desired_capbilities platform, browser, browser version and startup parameters.
ChromeOptions is chromedriver supported browser startup option.

from selenium import webdriver
options = webdriver.ChromeOptions()

options common attributes and methods are:

binary_location = '': Specifies the path to Chrome
debuger_address = ': a path to specify debugging
headless: no interface mode
add_argument (): add the boot argument
add_extension: Add a local plug-in
add_experimental_option: Adding the Experiment Options
to_capablilities: The options into standard formats capablitiies

By add_argument () start parameters can be added, such as initialization window size, stealth mode.

options.add_argument('headless')  # 无界面启动，也可以直接设置options.headless=True
driver = webdriver.Chrome(options=options)    # 相当于 driver = webdriver.Chrome(desired_capabilities=options.to_capablities())

However, due to chromedriver Chrome browser and updated version, I found that some parameters can not take effect in the Mac version 80 Chrome + version 80 chromedriver in

ChromeOptions Parameter Reference

ChromeOptions parameters that take effect

# 无界面模式
options.add_argument('headless')

# 指定用户客户端-模拟手机浏览
options.add_argument('user-agent="MQQBrowser/26 Mozilla/5.0 (Linux; U; Android 2.3.7; zh-cn; MB200 Build/GRJ22; CyanogenMod-7) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"')

# 禁用图片加载
options.add_argument('blink-settings=imagesEnabled=false')

# 隐身模式
options.add_argument('incognito')

# 自动打开开发者工具
options.add_argument("auto-open-devtools-for-tabs")

# 设置窗口尺寸，注意宽高之间使用逗号而不是x
options.add_argument('window-size=300,600')

# 设置窗口启动位置（左上角坐标）
options.add_argument('window-position=120,0')

# 禁用gpu渲染
options.add_argument('disable-gpu')

# 全屏启动
options.add_argument('start-fullscreen')

# 全屏启动，无地址栏
options.add_argument('kiosk') 

 # 启动时，不激活（前置）窗口
options.add_argument('no-startup-window') 
...

Invalid parameter

options.add_argument('--start-maximized')  # 最大化启动，无效
options.add_argument('url=https://www.baidu.com/')  # 设置启动的url，无效
options.add_argument('disable-infobars')  # 禁用inforbar，无效
options.add_argument('hide-scrollbars')  # 隐藏滚动条，无效

The reason is not clear, there are known or welcome message solutions.