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150 lessons published

Stage 04 · Testing & Code Quality

Selenium Complete Course

Browser automation with WebDriver, reliable synchronization, scalable Grid execution, BiDi observability, test architecture, and production CI workflows.

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30chapters
150lessons
Beginner → Advancedstarting level
Hands-onlearning mode
Course state150 published · 0 planned

Course brief

A complete browser-automation curriculum from first WebDriver session to scalable, secure, diagnosable cross-browser test systems.

This course is organized as a progressive operational curriculum from fundamentals through advanced production practice. Every lesson is published at its stable repository path and can be opened directly from the curriculum below.

By the end

You will be able to

  • Automate modern web applications reliably across browsers
  • Design maintainable page/component abstractions and synchronization strategies
  • Scale execution with Selenium Grid and parallel test architecture
  • Use WebDriver BiDi, browser logs, screenshots, and diagnostics to investigate failures
  • Integrate browser automation into secure, repeatable CI/CD pipelines

Complete syllabus

30 chapters in prerequisite order.

The structure moves from fundamentals through architecture, automation, security, reliability, troubleshooting, scaling, and production operations.

01

Chapter 1

Browser Automation and Test Engineering Foundations

5 lessons
01
Browser Automation and Test Engineering Foundations: Core Concepts and Mental ModelPublished lesson
Open 02
Browser Automation and Test Engineering Foundations: Guided Hands-On WorkflowPublished lesson
Open 03
Browser Automation and Test Engineering Foundations: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Browser Automation and Test Engineering Foundations: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Browser Automation and Test Engineering FoundationsPublished lesson
Open
02

Chapter 2

Selenium Ecosystem, Installation, and First WebDriver Session

5 lessons
01
Selenium Ecosystem, Installation, and First WebDriver Session: Core Concepts and Mental ModelPublished lesson
Open 02
Selenium Ecosystem, Installation, and First WebDriver Session: Guided Hands-On WorkflowPublished lesson
Open 03
Selenium Ecosystem, Installation, and First WebDriver Session: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Selenium Ecosystem, Installation, and First WebDriver Session: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Selenium Ecosystem, Installation, and First WebDriver SessionPublished lesson
Open
03

Chapter 3

WebDriver Architecture, W3C Protocol, Sessions, and Capabilities

5 lessons
01
WebDriver Architecture, W3C Protocol, Sessions, and Capabilities: Core Concepts and Mental ModelPublished lesson
Open 02
WebDriver Architecture, W3C Protocol, Sessions, and Capabilities: Guided Hands-On WorkflowPublished lesson
Open 03
WebDriver Architecture, W3C Protocol, Sessions, and Capabilities: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
WebDriver Architecture, W3C Protocol, Sessions, and Capabilities: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — WebDriver Architecture, W3C Protocol, Sessions, and CapabilitiesPublished lesson
Open
04

Chapter 4

Locators: ID, CSS, XPath, Relative Locators, and Resilient Selection

5 lessons
01
Locators: ID, CSS, XPath, Relative Locators, and Resilient Selection: Core Concepts and Mental ModelPublished lesson
Open 02
Locators: ID, CSS, XPath, Relative Locators, and Resilient Selection: Guided Hands-On WorkflowPublished lesson
Open 03
Locators: ID, CSS, XPath, Relative Locators, and Resilient Selection: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Locators: ID, CSS, XPath, Relative Locators, and Resilient Selection: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Locators: ID, CSS, XPath, Relative Locators, and Resilient SelectionPublished lesson
Open
05

Chapter 5

WebElement State, Interactions, Forms, and Validation

5 lessons
01
WebElement State, Interactions, Forms, and Validation: Core Concepts and Mental ModelPublished lesson
Open 02
WebElement State, Interactions, Forms, and Validation: Guided Hands-On WorkflowPublished lesson
Open 03
WebElement State, Interactions, Forms, and Validation: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
WebElement State, Interactions, Forms, and Validation: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — WebElement State, Interactions, Forms, and ValidationPublished lesson
Open
06

Chapter 6

Synchronization: Implicit, Explicit, Fluent, and Custom Waits

5 lessons
01
Synchronization: Implicit, Explicit, Fluent, and Custom Waits: Core Concepts and Mental ModelPublished lesson
Open 02
Synchronization: Implicit, Explicit, Fluent, and Custom Waits: Guided Hands-On WorkflowPublished lesson
Open 03
Synchronization: Implicit, Explicit, Fluent, and Custom Waits: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Synchronization: Implicit, Explicit, Fluent, and Custom Waits: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Synchronization: Implicit, Explicit, Fluent, and Custom WaitsPublished lesson
Open
07

Chapter 7

Keyboard, Pointer, Wheel, and Composite Actions API

5 lessons
01
Keyboard, Pointer, Wheel, and Composite Actions API: Core Concepts and Mental ModelPublished lesson
Open 02
Keyboard, Pointer, Wheel, and Composite Actions API: Guided Hands-On WorkflowPublished lesson
Open 03
Keyboard, Pointer, Wheel, and Composite Actions API: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Keyboard, Pointer, Wheel, and Composite Actions API: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Keyboard, Pointer, Wheel, and Composite Actions APIPublished lesson
Open
08

Chapter 8

Navigation, Windows, Tabs, Frames, and Iframes

5 lessons
01
Navigation, Windows, Tabs, Frames, and Iframes: Core Concepts and Mental ModelPublished lesson
Open 02
Navigation, Windows, Tabs, Frames, and Iframes: Guided Hands-On WorkflowPublished lesson
Open 03
Navigation, Windows, Tabs, Frames, and Iframes: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Navigation, Windows, Tabs, Frames, and Iframes: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Navigation, Windows, Tabs, Frames, and IframesPublished lesson
Open
09

Chapter 9

Alerts, Prompts, Modal Dialogs, and Browser Context Changes

5 lessons
01
Alerts, Prompts, Modal Dialogs, and Browser Context Changes: Core Concepts and Mental ModelPublished lesson
Open 02
Alerts, Prompts, Modal Dialogs, and Browser Context Changes: Guided Hands-On WorkflowPublished lesson
Open 03
Alerts, Prompts, Modal Dialogs, and Browser Context Changes: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Alerts, Prompts, Modal Dialogs, and Browser Context Changes: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Alerts, Prompts, Modal Dialogs, and Browser Context ChangesPublished lesson
Open
10

Chapter 10

Shadow DOM, Web Components, Dynamic DOMs, and Modern Front Ends

5 lessons
01
Shadow DOM, Web Components, Dynamic DOMs, and Modern Front Ends: Core Concepts and Mental ModelPublished lesson
Open 02
Shadow DOM, Web Components, Dynamic DOMs, and Modern Front Ends: Guided Hands-On WorkflowPublished lesson
Open 03
Shadow DOM, Web Components, Dynamic DOMs, and Modern Front Ends: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Shadow DOM, Web Components, Dynamic DOMs, and Modern Front Ends: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Shadow DOM, Web Components, Dynamic DOMs, and Modern Front EndsPublished lesson
Open
11

Chapter 11

File Uploads, Downloads, Cookies, Storage, and Session State

5 lessons
01
File Uploads, Downloads, Cookies, Storage, and Session State: Core Concepts and Mental ModelPublished lesson
Open 02
File Uploads, Downloads, Cookies, Storage, and Session State: Guided Hands-On WorkflowPublished lesson
Open 03
File Uploads, Downloads, Cookies, Storage, and Session State: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
File Uploads, Downloads, Cookies, Storage, and Session State: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — File Uploads, Downloads, Cookies, Storage, and Session StatePublished lesson
Open
12

Chapter 12

JavaScript Execution, Browser Capabilities, Profiles, and Preferences

5 lessons
01
JavaScript Execution, Browser Capabilities, Profiles, and Preferences: Core Concepts and Mental ModelPublished lesson
Open 02
JavaScript Execution, Browser Capabilities, Profiles, and Preferences: Guided Hands-On WorkflowPublished lesson
Open 03
JavaScript Execution, Browser Capabilities, Profiles, and Preferences: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
JavaScript Execution, Browser Capabilities, Profiles, and Preferences: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — JavaScript Execution, Browser Capabilities, Profiles, and PreferencesPublished lesson
Open
13

Chapter 13

Page Object, Page Component, Screenplay, and Test Abstraction Patterns

5 lessons
01
Page Object, Page Component, Screenplay, and Test Abstraction Patterns: Core Concepts and Mental ModelPublished lesson
Open 02
Page Object, Page Component, Screenplay, and Test Abstraction Patterns: Guided Hands-On WorkflowPublished lesson
Open 03
Page Object, Page Component, Screenplay, and Test Abstraction Patterns: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Page Object, Page Component, Screenplay, and Test Abstraction Patterns: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Page Object, Page Component, Screenplay, and Test Abstraction PatternsPublished lesson
Open
14

Chapter 14

Test Data, Parameterization, Fixtures, and Environment Configuration

5 lessons
01
Test Data, Parameterization, Fixtures, and Environment Configuration: Core Concepts and Mental ModelPublished lesson
Open 02
Test Data, Parameterization, Fixtures, and Environment Configuration: Guided Hands-On WorkflowPublished lesson
Open 03
Test Data, Parameterization, Fixtures, and Environment Configuration: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Test Data, Parameterization, Fixtures, and Environment Configuration: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Test Data, Parameterization, Fixtures, and Environment ConfigurationPublished lesson
Open
15

Chapter 15

Assertions, Failure Semantics, Retries, and Flaky-Test Control

5 lessons
01
Assertions, Failure Semantics, Retries, and Flaky-Test Control: Core Concepts and Mental ModelPublished lesson
Open 02
Assertions, Failure Semantics, Retries, and Flaky-Test Control: Guided Hands-On WorkflowPublished lesson
Open 03
Assertions, Failure Semantics, Retries, and Flaky-Test Control: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Assertions, Failure Semantics, Retries, and Flaky-Test Control: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Assertions, Failure Semantics, Retries, and Flaky-Test ControlPublished lesson
Open
16

Chapter 16

Cross-Browser, Responsive, Localization, and Compatibility Testing

5 lessons
01
Cross-Browser, Responsive, Localization, and Compatibility Testing: Core Concepts and Mental ModelPublished lesson
Open 02
Cross-Browser, Responsive, Localization, and Compatibility Testing: Guided Hands-On WorkflowPublished lesson
Open 03
Cross-Browser, Responsive, Localization, and Compatibility Testing: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Cross-Browser, Responsive, Localization, and Compatibility Testing: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Cross-Browser, Responsive, Localization, and Compatibility TestingPublished lesson
Open
17

Chapter 17

Screenshots, Logs, Network Evidence, and Failure Diagnostics

5 lessons
01
Screenshots, Logs, Network Evidence, and Failure Diagnostics: Core Concepts and Mental ModelPublished lesson
Open 02
Screenshots, Logs, Network Evidence, and Failure Diagnostics: Guided Hands-On WorkflowPublished lesson
Open 03
Screenshots, Logs, Network Evidence, and Failure Diagnostics: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Screenshots, Logs, Network Evidence, and Failure Diagnostics: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Screenshots, Logs, Network Evidence, and Failure DiagnosticsPublished lesson
Open
18

Chapter 18

WebDriver BiDi: Events, Network, Logs, Script, and Bidirectional Control

5 lessons
01
WebDriver BiDi: Events, Network, Logs, Script, and Bidirectional Control: Core Concepts and Mental ModelPublished lesson
Open 02
WebDriver BiDi: Events, Network, Logs, Script, and Bidirectional Control: Guided Hands-On WorkflowPublished lesson
Open 03
WebDriver BiDi: Events, Network, Logs, Script, and Bidirectional Control: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
WebDriver BiDi: Events, Network, Logs, Script, and Bidirectional Control: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — WebDriver BiDi: Events, Network, Logs, Script, and Bidirectional ControlPublished lesson
Open
19

Chapter 19

Selenium Grid Architecture, Roles, Routing, and Session Distribution

5 lessons
01
Selenium Grid Architecture, Roles, Routing, and Session Distribution: Core Concepts and Mental ModelPublished lesson
Open 02
Selenium Grid Architecture, Roles, Routing, and Session Distribution: Guided Hands-On WorkflowPublished lesson
Open 03
Selenium Grid Architecture, Roles, Routing, and Session Distribution: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Selenium Grid Architecture, Roles, Routing, and Session Distribution: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Selenium Grid Architecture, Roles, Routing, and Session DistributionPublished lesson
Open
20

Chapter 20

Deploying Grid with Containers, Kubernetes, and Cloud Infrastructure

5 lessons
01
Deploying Grid with Containers, Kubernetes, and Cloud Infrastructure: Core Concepts and Mental ModelPublished lesson
Open 02
Deploying Grid with Containers, Kubernetes, and Cloud Infrastructure: Guided Hands-On WorkflowPublished lesson
Open 03
Deploying Grid with Containers, Kubernetes, and Cloud Infrastructure: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Deploying Grid with Containers, Kubernetes, and Cloud Infrastructure: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Deploying Grid with Containers, Kubernetes, and Cloud InfrastructurePublished lesson
Open
21

Chapter 21

Parallel Execution, Isolation, Concurrency, and Test Sharding

5 lessons
01
Parallel Execution, Isolation, Concurrency, and Test Sharding: Core Concepts and Mental ModelPublished lesson
Open 02
Parallel Execution, Isolation, Concurrency, and Test Sharding: Guided Hands-On WorkflowPublished lesson
Open 03
Parallel Execution, Isolation, Concurrency, and Test Sharding: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Parallel Execution, Isolation, Concurrency, and Test Sharding: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Parallel Execution, Isolation, Concurrency, and Test ShardingPublished lesson
Open
22

Chapter 22

CI/CD Integration with GitHub Actions, GitLab CI, and Jenkins

5 lessons
01
CI/CD Integration with GitHub Actions, GitLab CI, and Jenkins: Core Concepts and Mental ModelPublished lesson
Open 02
CI/CD Integration with GitHub Actions, GitLab CI, and Jenkins: Guided Hands-On WorkflowPublished lesson
Open 03
CI/CD Integration with GitHub Actions, GitLab CI, and Jenkins: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
CI/CD Integration with GitHub Actions, GitLab CI, and Jenkins: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — CI/CD Integration with GitHub Actions, GitLab CI, and JenkinsPublished lesson
Open
23

Chapter 23

Authentication Flows, Proxies, Certificates, and Enterprise Browser Environments

5 lessons
01
Authentication Flows, Proxies, Certificates, and Enterprise Browser Environments: Core Concepts and Mental ModelPublished lesson
Open 02
Authentication Flows, Proxies, Certificates, and Enterprise Browser Environments: Guided Hands-On WorkflowPublished lesson
Open 03
Authentication Flows, Proxies, Certificates, and Enterprise Browser Environments: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Authentication Flows, Proxies, Certificates, and Enterprise Browser Environments: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Authentication Flows, Proxies, Certificates, and Enterprise Browser EnvironmentsPublished lesson
Open
24

Chapter 24

Security, Privacy, Test Accounts, and Safe Automation Boundaries

5 lessons
01
Security, Privacy, Test Accounts, and Safe Automation Boundaries: Core Concepts and Mental ModelPublished lesson
Open 02
Security, Privacy, Test Accounts, and Safe Automation Boundaries: Guided Hands-On WorkflowPublished lesson
Open 03
Security, Privacy, Test Accounts, and Safe Automation Boundaries: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Security, Privacy, Test Accounts, and Safe Automation Boundaries: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Security, Privacy, Test Accounts, and Safe Automation BoundariesPublished lesson
Open
25

Chapter 25

Performance Engineering for Test Suites and Grid Capacity

5 lessons
01
Performance Engineering for Test Suites and Grid Capacity: Core Concepts and Mental ModelPublished lesson
Open 02
Performance Engineering for Test Suites and Grid Capacity: Guided Hands-On WorkflowPublished lesson
Open 03
Performance Engineering for Test Suites and Grid Capacity: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Performance Engineering for Test Suites and Grid Capacity: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Performance Engineering for Test Suites and Grid CapacityPublished lesson
Open
26

Chapter 26

Selenium IDE, Record/Playback, and Migration to Maintainable Code

5 lessons
01
Selenium IDE, Record/Playback, and Migration to Maintainable Code: Core Concepts and Mental ModelPublished lesson
Open 02
Selenium IDE, Record/Playback, and Migration to Maintainable Code: Guided Hands-On WorkflowPublished lesson
Open 03
Selenium IDE, Record/Playback, and Migration to Maintainable Code: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Selenium IDE, Record/Playback, and Migration to Maintainable Code: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Selenium IDE, Record/Playback, and Migration to Maintainable CodePublished lesson
Open
27

Chapter 27

Framework Integration: pytest, JUnit, TestNG, NUnit, and Language Bindings

5 lessons
01
Framework Integration: pytest, JUnit, TestNG, NUnit, and Language Bindings: Core Concepts and Mental ModelPublished lesson
Open 02
Framework Integration: pytest, JUnit, TestNG, NUnit, and Language Bindings: Guided Hands-On WorkflowPublished lesson
Open 03
Framework Integration: pytest, JUnit, TestNG, NUnit, and Language Bindings: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Framework Integration: pytest, JUnit, TestNG, NUnit, and Language Bindings: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Framework Integration: pytest, JUnit, TestNG, NUnit, and Language BindingsPublished lesson
Open
28

Chapter 28

Debugging Stale Elements, Timing Races, Driver Failures, and Grid Incidents

5 lessons
01
Debugging Stale Elements, Timing Races, Driver Failures, and Grid Incidents: Core Concepts and Mental ModelPublished lesson
Open 02
Debugging Stale Elements, Timing Races, Driver Failures, and Grid Incidents: Guided Hands-On WorkflowPublished lesson
Open 03
Debugging Stale Elements, Timing Races, Driver Failures, and Grid Incidents: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Debugging Stale Elements, Timing Races, Driver Failures, and Grid Incidents: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Debugging Stale Elements, Timing Races, Driver Failures, and Grid IncidentsPublished lesson
Open
29

Chapter 29

Test Architecture, Governance, Coding Standards, and Suite Evolution

5 lessons
01
Test Architecture, Governance, Coding Standards, and Suite Evolution: Core Concepts and Mental ModelPublished lesson
Open 02
Test Architecture, Governance, Coding Standards, and Suite Evolution: Guided Hands-On WorkflowPublished lesson
Open 03
Test Architecture, Governance, Coding Standards, and Suite Evolution: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Test Architecture, Governance, Coding Standards, and Suite Evolution: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Test Architecture, Governance, Coding Standards, and Suite EvolutionPublished lesson
Open
30

Chapter 30

Capstone: Build and Operate a Production Cross-Browser Automation Platform

5 lessons
01
Capstone: Build and Operate a Production Cross-Browser Automation Platform: Core Concepts and Mental ModelPublished lesson
Open 02
Capstone: Build and Operate a Production Cross-Browser Automation Platform: Guided Hands-On WorkflowPublished lesson
Open 03
Capstone: Build and Operate a Production Cross-Browser Automation Platform: Configuration, Design Patterns, and Trade-OffsPublished lesson
Open 04
Capstone: Build and Operate a Production Cross-Browser Automation Platform: Diagnostics, Failure Modes, and Production PracticesPublished lesson
Open 05
Checkpoint Lab — Capstone: Build and Operate a Production Cross-Browser Automation PlatformPublished lesson
Open

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