Headless is Going Away!

Now that we got your attention, headless is not actually going away, just the convenience method to set it in Selenium
By Diego Molina (@diegofmolina) |
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Headless is an execution mode for Firefox and Chromium based browsers. It allows users to run automated scripts in headless mode, meaning that the browser window wouldn’t be visible. In most of Selenium’s bindings there is a convenience method to set this execution mode while setting the browser options. However, Selenium 4.8.0 will be deprecated this method and now users need to set it through arguments when setting the browser options.

Why is Selenium doing this?

Chromium based browsers have now two different headless modes (the original one, and one with more capabilities added in 2022). When a user sets headless to true via the convenience method in Selenium, it is using the initial method provided by Chromium based browsers.

By deprecating the convenience method (and removing it in Selenium 4.10.0), users will be in full control to choose which headless mode they want to use.

What are the two headless modes?

The traditional --headless, and since version 96, Chrome has a new headless mode that allows users to get the full browser functionality (even run extensions). Between versions 96 to 108 it was --headless=chrome, after version 109 --headless=new.

Using --headless=new should bring a better experience when using headless with Selenium.

Thanks to Michael Mintz for the detailed explanation!

Check more details about the new headleass mode at the official Chrome blog.

How can I set headless mode from now on?

In short, users can add the headless mode they want to use through arguments in browser options.

Before

ChromeOptions options = new ChromeOptions();
options.setHeadless(true);
WebDriver driver = new ChromeDriver(options);
driver.get("https://selenium.dev");
driver.quit();
let driver = await env
  .builder()
  .setChromeOptions(new chrome.Options().headless())
  .build();
await driver.get('https://selenium.dev');
await driver.quit();
// C# did not have a convenience method
options = Selenium::WebDriver::Chrome::Options.new
options.headless!
driver = Selenium::WebDriver.for :chrome, options: options
driver.get('https://selenium.dev')
driver.quit
options = ChromeOptions()
options.headless = True
driver = webdriver.Chrome(options=options)
driver.get('http://selenium.dev')
driver.quit()

After

ChromeOptions options = new ChromeOptions();
options.addArguments("--headless=new");
WebDriver driver = new ChromeDriver(options);
driver.get("https://selenium.dev");
driver.quit();
let driver = await env
  .builder()
  .setChromeOptions(options.addArguments('--headless=new'))
  .build();
await driver.get('https://selenium.dev');
await driver.quit();
var options = new ChromeOptions();
options.AddArgument("--headless=new");
var driver = new ChromeDriver(options);
driver.Navigate().GoToUrl("https://selenium.dev");
driver.Quit();
options = Selenium::WebDriver::Options.chrome(args: ['--headless=new'])
driver = Selenium::WebDriver.for :chrome, options: options
driver.get('https://selenium.dev')
driver.quit
options = ChromeOptions()
options.add_argument("--headless=new")
driver = webdriver.Chrome(options=options)
driver.get('http://selenium.dev')
driver.quit()

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Happy testing!