Selenium interview questions
// 37 QUESTIONS · UPDATED MAY 2026
Selenium WebDriver interview questions covering waits, Page Object Model, Grid, parallel execution, and framework design decisions for Java, Python, and JavaScript codebases.
Showing 37 of 37 questions
- What are the different types of waits in Selenium?Junior
Implicit waits set a global polling timeout for findElement; explicit waits poll for a specific condition; fluent waits add custom pollin…
- Explain the Page Object Model with a concrete example.Mid
Page Object Model wraps each page (or significant component) as a class that exposes user-level actions and hides locators. Tests stay re…
- What is Selenium WebDriver and what does it do?Junior
Selenium WebDriver is a browser automation library that drives a real browser via the W3C WebDriver protocol. Your test code sends comman…
- What is the difference between Selenium IDE, Selenium WebDriver, and Selenium Grid?Junior
IDE is a record-and-playback browser extension for quick scripts. WebDriver is the programmatic browser-control library you build real te…
- What is a WebElement and how do you locate one?Junior
A WebElement is a Selenium handle to a DOM element on the current page. You locate one with `driver.findElement(By.<strategy>(value))` us…
- List the locator strategies in Selenium and rank them by reliability.Junior
The strategies are id, name, css, xpath, class name, tag name, link text, partial link text. Practical ranking: data-test attributes via…
- What is the difference between findElement and findElements?Junior
findElement returns a single WebElement and throws NoSuchElementException if nothing matches. findElements returns a list — empty if no m…
- How do you handle a dropdown in Selenium WebDriver?Junior
For native `<select>`, wrap the element in `Select` and use `selectByVisibleText`, `selectByValue`, or `selectByIndex`. For custom dropdo…
- What is the difference between absolute and relative XPath?Junior
Absolute XPath starts from the document root with `/html/body/...` and depends on the full DOM hierarchy — fragile. Relative XPath starts…
- How do you take a screenshot on test failure?Junior
Cast the driver to `TakesScreenshot`, call `getScreenshotAs(OutputType.FILE)`, and copy to disk. Wire it into your test framework's failu…
- What is the Actions class in Selenium and when do you use it?Mid
The Actions class builds composite mouse and keyboard sequences — hover, drag-and-drop, right-click, key chords, double-click. You chain…
- What is the difference between driver.close() and driver.quit()?Mid
`close()` shuts the current window/tab — the browser keeps running if other tabs exist. `quit()` ends the entire WebDriver session, kills…
- Walk through how Selenium Manager (4.10+) replaces webdriver-manager.Mid
Selenium Manager is built into Selenium 4.10+ and auto-detects the installed browser version, downloads the matching driver binary, cache…
- How do you handle a StaleElementReferenceException?Mid
It means the WebElement you held a handle to was removed or replaced in the DOM. Don't catch and retry blindly — re-locate the element af…
- How do you switch between windows and tabs in Selenium?Mid
Track window handles with `getWindowHandles()`, identify the new one by diffing against the original, and switch with `driver.switchTo().…
- How do you handle iframes in Selenium WebDriver?Mid
Switch into the frame with `driver.switchTo().frame(...)` (by element, name, or index) before interacting with elements inside it. Switch…
- What is the @FindBy annotation and how does PageFactory work?Mid
@FindBy declares a locator on a WebElement field, and PageFactory.initElements wires up lazy proxies — the actual lookup happens when you…
- How do you handle SSL certificate errors in tests?Mid
Set browser options to accept insecure certs: `ChromeOptions.setAcceptInsecureCerts(true)` (or the Firefox equivalent). This bypasses the…
- How do you upload a file with Selenium WebDriver?Mid
For native `<input type="file">`: send the absolute file path to the input with `.sendKeys(path)` — the browser treats it as a selection.…
- How do you scroll to an element in the page?Mid
Use `executeScript("arguments[0].scrollIntoView({block:'center'})", element)` — reliable across browsers. Actions.moveToElement also scro…
- How do you handle authentication popups (basic auth) in Selenium?Mid
Most reliable: embed credentials in the URL — `https://user:pass@host/path`. For Chromium, use Chrome DevTools Protocol's `Network.setExt…
- How do you simulate keyboard shortcuts in Selenium?Mid
Use the Actions class with `keyDown` / `keyUp` / `sendKeys` to model modifier+key combinations. `Actions.keyDown(Keys.CONTROL).sendKeys("…
- How do you handle dynamic web elements with changing IDs?Mid
Use stable attributes the framework doesn't generate — `data-test`, role, name, or text — instead of generated ids. If you must match a g…
- Explain the Selenium Grid architecture (hub/node) and when to use it.Mid
Grid distributes WebDriver tests across machines. A hub receives session requests and routes to a pool of nodes that host browsers. Use i…
- How do you parameterise tests with TestNG data providers?Mid
Annotate a method with `@DataProvider(name = "...")` returning `Object[][]` — each row is one test invocation. Reference it with `@Test(d…
- How would you architect a Selenium framework from scratch for a Java team?Senior
Layered: driver factory + config → page objects + components → test base classes → tests + data providers. Use Maven, TestNG, AssertJ, Al…
- Walk through your strategy for stable selectors that survive UI refactors.Senior
Push for `data-test` (or similar) attributes on every interactive element. Treat them as test API — versioned, code-reviewed, never remov…
- How would you handle parallel execution of Selenium tests across browsers?Senior
Run TestNG parallel at method/class level with `ThreadLocal<WebDriver>` to keep instances thread-safe. For multi-browser: use TestNG suit…
- How do you debug a Selenium test that fails only in headless mode?Senior
Reproduce locally with `--headless=new`, take screenshots and HTML dumps at each step, capture browser console + network logs, and compar…
- How would you integrate Selenium tests into a Jenkins pipeline with reporting?Senior
Declarative Jenkinsfile with stages: checkout → build → start Grid → run TestNG → publish results. Allure or Extent for reports, JUnit XM…
- Compare a Java/Selenium framework with a JavaScript/Playwright stack — when to choose which?Senior
Pick to match the team's primary language. Java/Selenium fits enterprise teams with Java backends, mature build tooling, and existing Sel…
- How do you reduce flakiness in a 500+ test Selenium suite?Senior
Measure first (per-test rerun rate), categorise by cause (waits, data, environment, app bugs), then fix in priority: explicit waits every…
- How would you migrate a Selenium suite to Playwright incrementally?Senior
Run both suites in parallel during migration. Migrate by feature area, smoke first, regression second. Pick a 'tracer bullet' feature, po…
- How would you set up Selenium Grid 4 in Docker for CI usage?Senior
Docker Compose with a hub container and chrome/firefox node containers, scaled with `--scale chrome=N`. Tests connect via `RemoteWebDrive…
- Walk through how you'd test a feature requiring a specific browser version that's no longer in the official driver library.Senior
Pin the browser binary, find the matching driver from the vendor's download archive, configure the WebDriver with explicit binary + drive…
- How would you justify continued investment in Selenium when newer tools exist?Lead
Frame it in business terms: cost of migration vs cost of staying. If the suite is stable, the team is fluent, and Selenium meets the prod…
- How do you structure mentoring for engineers new to test automation in a Java/Selenium codebase?Lead
Three-layer onboarding: language fundamentals (Java + Maven + JUnit/TestNG), framework patterns (page objects, waits, fixtures), then the…