Headless execution in Selenium Java - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is headless execution in Selenium?

Headless execution means running browser tests without opening the browser window. It runs in the background, making tests faster and suitable for servers.

beginner

How do you enable headless mode in ChromeDriver using Selenium Java?

You add the argument --headless to ChromeOptions and pass it to ChromeDriver. Example:<br>

ChromeOptions options = new ChromeOptions();
options.addArguments("--headless");
WebDriver driver = new ChromeDriver(options);

intermediate

Why is headless execution useful in Continuous Integration (CI) environments?

Because CI servers often have no display, headless tests run without needing a visible browser. This saves resources and speeds up automated testing.

intermediate

Name one limitation of headless browser testing.

Some visual bugs or UI issues might not be detected because the browser window is not visible. Also, some websites behave differently in headless mode.

beginner

How can you verify that your Selenium test is running in headless mode?

You can check the browser options in your test code or look for the absence of a browser window during test execution. Logs may also indicate headless mode is active.

What does headless execution mean in Selenium?

A Running tests only on mobile devices

B Running tests without opening a browser window

C Running tests with a visible browser window

D Running tests without internet connection

Headless execution runs browser tests without showing the browser window.

Which argument enables headless mode in ChromeOptions?

A --headless

B --start-maximized

C --disable-gpu

D --no-sandbox

The argument '--headless' tells Chrome to run without a GUI.

Why is headless execution preferred in CI pipelines?

A It shows the browser window for debugging

B It requires a display server

C It uses more memory

D It runs faster and uses fewer resources

Headless mode runs faster and uses fewer resources, ideal for CI.

Which is a common limitation of headless browser testing?

A It cannot detect visual UI bugs easily

B It requires manual interaction

C It cannot run JavaScript

D It only works on Firefox

Headless mode may miss visual UI issues since no window is shown.

How do you pass ChromeOptions to ChromeDriver in Selenium Java?

A ChromeDriver(options);

B new ChromeDriver();

C new ChromeDriver(options);

D ChromeDriver.new(options);

You create ChromeDriver with options: new ChromeDriver(options);

Explain what headless execution is and why it is useful in automated testing.

Think about running tests without seeing the browser.

Describe how to set up headless mode in Selenium using Java and ChromeDriver.

Focus on the code steps to enable headless.