Master HTML Validation

Learn how to ensure your HTML adheres to modern standards with interactive examples and real-world insights.

Why Validate?

HTML validation ensures your code works across all browsers, improves accessibility, and maintains clean source code. It's the foundation for semantic web development.

Prevents rendering inconsistencies
Improves SEO and accessibility
Future-proofs your codebase

Code Quality Checker




    
    Valid Page


    Navigation
    Content
    Footer

Example of valid HTML5 structure

HTML Validation Tools

🔍

W3C Validator

The official validator for HTML, CSS, and more. Provides detailed error reports with line numbers.

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🛠

VS Code Linter

Real-time validation in your editor. Instant feedback while coding with HTML/CSS validation.

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📈

Lighthouse

Chrome's built-in performance and accessibility tool that includes HTML validation checks.

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Live Validation Demo

Continue Your Learning Journey

A11Y Fundamentals

Learn how validation affects accessibility and how to create inclusive web experiences.

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HTML5 Semantics

Master modern semantic elements and structured markup for better validation.

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Validation Workflows

Automate validation in your development process with CI/CD integrations.

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