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SeleniumDecoded

Master Selenium Test Automation

Lessons, recipes, quizzes and interview prep with every example in Java, Python, JavaScript, and C#. Verified against Selenium 4.48.0: from your first test to WebDriver BiDi and Grid on Kubernetes.

Start Learning View Cheat Sheet
67
Lessons
27
Recipes
122
Quiz questions
Selenium test automation illustration showing robot arms interacting with browser windows and code
Latest release

Selenium 4.48.0 · 27 Aug 2026

BiDi protocol layers generated from a shared schema; Grid file transfer for Kubernetes, Docker and relay sessions

Releases & News What's new in Selenium 4
  • 27 Apr 2026

    .NET assemblies are now strongly signed

  • 4 Apr 2026

    Selenium Grid Docker images mirrored to GitHub Container Registry

  • 10 Mar 2026

    Chrome moves to two-week releases

Content verified against Selenium 4.48.0 on 9 Sept 2026. Minimums: Java 11+, Python 3.10+.

Selenium in 2026

The topics that did not exist when most Selenium tutorials were written.

All modern lessons →

WebDriver BiDi

Console errors, auth, DOM events and preload scripts across browsers.

Network interception

Block, modify and mock requests without a proxy.

Selenium vs Playwright vs Cypress

The honest 2026 comparison and how to decide.

Grid on Kubernetes

Native Pods, session events, Redis state, failure-only video.

AI-assisted testing

What works, what to avoid, and the guardrails.

Migrating from Selenium 3

Capabilities, Duration timeouts, Service objects, checklist.
27

Copy-paste recipes

Stale elements, downloads, basic auth, mocking, hover menus, cookie banners. One problem, one working solution, four languages.
72

Interview questions with answers

Junior to senior plus scenario questions, each linked to the lesson that goes deeper, and live-coding challenges to practise on.
122 + 10

Quiz questions and debugging challenges

Twelve quizzes across every chapter with saved best scores, and ten broken tests to fix with progressive hints.

Learning Path

67 lessons in 10 chapters, from first test to WebDriver BiDi

View All Lessons
Chapter 1 · 7 lessons

Setup & Basics

  • Getting Started with Selenium
  • Browser Options & Configuration
  • Finding Elements
  • Project Structure
  • +3 more
Chapter 2 · 6 lessons

Locators & Navigation

  • ID, Name, and Class Locators
  • CSS Selectors
  • XPath Basics
  • XPath Advanced Techniques
  • +2 more
Chapter 3 · 7 lessons

Actions & Interactions

  • Click and Type
  • Forms and Inputs
  • Dropdowns and Select Elements
  • Drag and Drop
  • +3 more
Chapter 4 · 6 lessons

Waits & Synchronization

  • Implicit Waits
  • Explicit Waits
  • Fluent Waits
  • Expected Conditions
  • +2 more
Chapter 5 · 9 lessons

Advanced Features

  • iFrames and Frames
  • Windows and Tabs
  • Alerts and Popups
  • File Uploads
  • +5 more
Chapter 6 · 5 lessons

Design Patterns

  • Page Object Model
  • Page Factory
  • Data-Driven Testing
  • Screenplay Pattern
  • +1 more
Chapter 7 · 9 lessons

Frameworks & Integrations

  • TestNG and JUnit Integration
  • pytest Integration
  • Mocha and Jest
  • Cucumber and BDD
  • +5 more
Chapter 8 · 5 lessons

Debugging & Best Practices

  • Debugging Tips
  • Screenshots and Videos
  • Common Errors
  • Flaky Tests: Diagnosis and Cure
  • +1 more
Chapter 9 · 6 lessons

Performance & Scaling

  • Parallel Execution
  • Selenium Grid
  • Headless Browsers
  • Grid on Docker and Kubernetes
  • +2 more
Chapter 10 · 7 lessons

Selenium 4, BiDi & Beyond

  • What's New in Selenium 4
  • Migrating from Selenium 3 to 4
  • WebDriver BiDi
  • Network Interception with BiDi
  • +3 more

Everything you need to master Selenium

Structured learning path with practical examples and hands-on practice

Multi-Language Examples

Every tutorial includes code in Java, Python, JavaScript, and C#. Switch languages with a single click.

Best Practices

Learn patterns that scale. Every example is tagged with robustness ratings so you know what works in production.

Quizzes That Remember

A quiz for every chapter. Your best score is saved locally so you can see where to revise.

Challenges & Interview Prep

Fix real broken tests with progressive hints, then rehearse junior-to-senior interview questions with model answers.

Printable Cheat Sheet

Quick reference for all Selenium commands. Print it, bookmark it, or keep it on your second monitor.

Current, Not Copied

Verified against the latest Selenium 4.4x release. BiDi, Selenium Manager, Kubernetes Grid and the Selenium 5 roadmap, not 2019 tutorials.

Frequently Asked Questions

Quick answers to common questions

What programming languages are covered?

All tutorials include code examples in Java, Python, JavaScript (with Selenium WebDriver), and C#. You can switch between languages with a single click.

Is this suitable for beginners?

Yes. Chapter 1 starts with installation, how WebDriver works and your first test. Each chapter builds on the last, and the quizzes let you check understanding as you go. Senior engineers will find the BiDi, Grid, patterns and interview sections go deep.

Does this cover Selenium 4?

Yes. Content is verified against the current Selenium 4.4x releases and covers Selenium Manager, relative locators, WebDriver BiDi, Kubernetes-native Grid and the Selenium 5 roadmap. Every example is tagged with version compatibility.

Is this free?

Yes, completely free. All tutorials, quizzes, challenges, and the cheat sheet are available without any registration or payment.

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